Merge branch 'master' of github.com:grpc/grpc into rr_with_registry

214 files changed, 2739 insertions, 1760 deletions

diff --git a/INSTALL b/INSTALL
index de13d65d41..a0df57dcd3 100644
--- a/INSTALL
+++ b/INSTALL
@@ -11,12 +11,12 @@ wiki pages:
 
 On Linux (Debian):
 
- Note: you will need to add the Debian 'testing' distribution to your sources
+ Note: you will need to add the Debian 'jessie-backports' distribution to your sources
  file first.
 
  Add the following line to your `/etc/apt/sources.list` file:
 
-   deb http://ftp.us.debian.org/debian testing main contrib non-free
+   deb http://http.debian.net/debian jessie-backports main
 
  Install the gRPC library:
 
diff --git a/Makefile b/Makefile
index 29b15a28bb..abca772282 100644
--- a/Makefile
+++ b/Makefile
@@ -145,7 +145,7 @@ CC_tsan = clang
 CXX_tsan = clang++
 LD_tsan = clang
 LDXX_tsan = clang++
-CPPFLAGS_tsan = -O0 -fsanitize=thread -fno-omit-frame-pointer -Wno-error=unused-command-line-argument
+CPPFLAGS_tsan = -O0 -fsanitize=thread -fno-omit-frame-pointer -Wno-unused-command-line-argument
 LDFLAGS_tsan = -fsanitize=thread
 DEFINES_tsan = NDEBUG GRPC_TEST_SLOWDOWN_BUILD_FACTOR=10
 
@@ -155,7 +155,7 @@ CC_asan = clang
 CXX_asan = clang++
 LD_asan = clang
 LDXX_asan = clang++
-CPPFLAGS_asan = -O0 -fsanitize=address -fno-omit-frame-pointer -Wno-error=unused-command-line-argument
+CPPFLAGS_asan = -O0 -fsanitize=address -fno-omit-frame-pointer -Wno-unused-command-line-argument
 LDFLAGS_asan = -fsanitize=address
 DEFINES_asan = GRPC_TEST_SLOWDOWN_BUILD_FACTOR=3
 
@@ -165,7 +165,7 @@ CC_msan = clang
 CXX_msan = clang++-libc++
 LD_msan = clang
 LDXX_msan = clang++-libc++
-CPPFLAGS_msan = -O0 -fsanitize=memory -fsanitize-memory-track-origins -fno-omit-frame-pointer -DGTEST_HAS_TR1_TUPLE=0 -DGTEST_USE_OWN_TR1_TUPLE=1 -Wno-error=unused-command-line-argument
+CPPFLAGS_msan = -O0 -fsanitize=memory -fsanitize-memory-track-origins -fno-omit-frame-pointer -DGTEST_HAS_TR1_TUPLE=0 -DGTEST_USE_OWN_TR1_TUPLE=1 -Wno-unused-command-line-argument
 OPENSSL_CFLAGS_msan = -DPURIFY
 LDFLAGS_msan = -fsanitize=memory -DGTEST_HAS_TR1_TUPLE=0 -DGTEST_USE_OWN_TR1_TUPLE=1
 DEFINES_msan = NDEBUG GRPC_TEST_SLOWDOWN_BUILD_FACTOR=4
@@ -176,7 +176,7 @@ CC_ubsan = clang
 CXX_ubsan = clang++
 LD_ubsan = clang
 LDXX_ubsan = clang++
-CPPFLAGS_ubsan = -O1 -fsanitize=undefined -fno-omit-frame-pointer -Wno-error=unused-command-line-argument
+CPPFLAGS_ubsan = -O1 -fsanitize=undefined -fno-omit-frame-pointer -Wno-unused-command-line-argument
 OPENSSL_CFLAGS_ubsan = -DPURIFY
 LDFLAGS_ubsan = -fsanitize=undefined
 DEFINES_ubsan = NDEBUG GRPC_TEST_SLOWDOWN_BUILD_FACTOR=3
@@ -245,7 +245,7 @@ ifdef EXTRA_DEFINES
 DEFINES += $(EXTRA_DEFINES)
 endif
 
-CFLAGS += -std=c89 -pedantic
+CFLAGS += -std=c89 -pedantic -Wsign-conversion -Wconversion
 ifeq ($(HAS_CXX11),true)
 CXXFLAGS += -std=c++11
 else
diff --git a/doc/interop-test-descriptions.md b/doc/interop-test-descriptions.md
index ddeee66d67..8649213bc6 100644
--- a/doc/interop-test-descriptions.md
+++ b/doc/interop-test-descriptions.md
@@ -513,7 +513,9 @@ token (created by the project's key file)
 
 Test caller should set flag `--service_account_key_file` with the
 path to json key file downloaded from
-https://console.developers.google.com.
+https://console.developers.google.com. Alternately, if using a
+usable auth implementation, she may specify the file location in the environment
+variable GOOGLE_APPLICATION_CREDENTIALS.
 
 Server features:
 * [UnaryCall][]
@@ -540,7 +542,7 @@ Client asserts:
 * call was successful
 * received SimpleResponse.username is not empty and is in the json key file used
 by the auth library. The client can optionally check the username matches the
-email address in the key file.
+email address in the key file or equals the value of `--default_service_account` flag.
 * response payload body is 314159 bytes in size
 * clients are free to assert that the response payload body contents are zero
   and comparing the entire response message against a golden response
@@ -598,7 +600,7 @@ json key file or GCE default service account email.
 
 Similar to the other auth tests, this test is only for cloud-to-prod path.
 
-This test verifies unary calls succeed in sending messages using a JWT
+This test verifies unary calls succeed in sending messages using a JWT or a service account
 credentials set on the RPC.
 
 The test
@@ -606,6 +608,10 @@ The test
 downloaded from https://console.developers.google.com. Alternately, if using a
 usable auth implementation, it may specify the file location in the environment
 variable GOOGLE_APPLICATION_CREDENTIALS
+- optionally uses the flag `--oauth_scope` for the oauth scope if implementator 
+wishes to use service account credential instead of JWT credential. For testing
+against grpc-test.sandbox.google.com, oauth scope 
+"https://www.googleapis.com/auth/xapi.zoo" should be used.
 
 Server features:
 * [UnaryCall][]
diff --git a/examples/python/helloworld/README.md b/examples/python/helloworld/README.md
index 8fde0d2315..070b9e8837 100644
--- a/examples/python/helloworld/README.md
+++ b/examples/python/helloworld/README.md
@@ -91,9 +91,6 @@ Which internally invokes the proto-compiler as:
 $ protoc -I ../../protos --python_out=. --grpc_out=. --plugin=protoc-gen-grpc=`which grpc_python_plugin` ../../protos/helloworld.proto
 ```
 
-Optionally, you can just skip the code generation step as the generated python module has already
-been generated for you (helloworld_pb2.py).
-
 ### The client
 
 Client-side code can be found in [greeter_client.py](greeter_client.py).
diff --git a/examples/python/helloworld/greeter_client.py b/examples/python/helloworld/greeter_client.py
index 370ce46770..561b25bcb2 100755..100644
--- a/examples/python/helloworld/greeter_client.py
+++ b/examples/python/helloworld/greeter_client.py
@@ -29,15 +29,18 @@
 
 """The Python implementation of the GRPC helloworld.Greeter client."""
 
+from grpc.beta import implementations
+
 import helloworld_pb2
 
 _TIMEOUT_SECONDS = 10
 
 
 def run():
-  with helloworld_pb2.early_adopter_create_Greeter_stub('localhost', 50051) as stub:
-    response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'), _TIMEOUT_SECONDS)
-    print "Greeter client received: " + response.message
+  channel = implementations.insecure_channel('localhost', 50051)
+  stub = helloworld_pb2.beta_create_Greeter_stub(channel)
+  response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'), _TIMEOUT_SECONDS)
+  print "Greeter client received: " + response.message
 
 
 if __name__ == '__main__':
diff --git a/examples/python/helloworld/greeter_server.py b/examples/python/helloworld/greeter_server.py
index 81353666b1..1514d8f270 100644
--- a/examples/python/helloworld/greeter_server.py
+++ b/examples/python/helloworld/greeter_server.py
@@ -36,15 +36,15 @@ import helloworld_pb2
 _ONE_DAY_IN_SECONDS = 60 * 60 * 24
 
 
-class Greeter(helloworld_pb2.EarlyAdopterGreeterServicer):
+class Greeter(helloworld_pb2.BetaGreeterServicer):
 
   def SayHello(self, request, context):
     return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)
 
 
 def serve():
-  server = helloworld_pb2.early_adopter_create_Greeter_server(
-      Greeter(), 50051, None, None)
+  server = helloworld_pb2.beta_create_Greeter_server(Greeter())
+  server.add_insecure_port('[::]:50051')
   server.start()
   try:
     while True:
diff --git a/examples/python/route_guide/README.md b/examples/python/route_guide/README.md
index 636e134964..cb1aa7d78a 100644
--- a/examples/python/route_guide/README.md
+++ b/examples/python/route_guide/README.md
@@ -29,7 +29,7 @@ Then change your current directory to `examples/python/route_guide`:
 $ cd examples/python/route_guide
 ```
 
-You also should have the relevant tools installed to generate the server and client interface code - if you don't already, follow the setup instructions in [the Python quick start guide](../python).
+You also should have the relevant tools installed to generate the server and client interface code - if you don't already, follow the setup instructions in [the Python quick start guide](../helloworld).
 
 ## Defining the service
 
@@ -99,12 +99,11 @@ $ protoc -I ../../protos --python_out=. --grpc_out=. --plugin=protoc-gen-grpc=`w
 Note that as we've already provided a version of the generated code in the example repository, running this command regenerates the appropriate file rather than creates a new one. The generated code file is called `route_guide_pb2.py` and contains:
 - classes for the messages defined in route_guide.proto
 - abstract classes for the service defined in route_guide.proto
-   - `EarlyAdopterRouteGuideServicer`, which defines the interface for implementations of the RouteGuide service
-   - `EarlyAdopterRouteGuideServer`, which may be started and stopped
-   - `EarlyAdopterRouteGuideStub`, which can be used by clients to invoke RouteGuide RPCs
+   - `BetaRouteGuideServicer`, which defines the interface for implementations of the RouteGuide service
+   - `BetaRouteGuideStub`, which can be used by clients to invoke RouteGuide RPCs
 - functions for application use
-   - `early_adopter_create_RouteGuide_server`, which creates a gRPC server given an `EarlyAdopterRouteGuideServicer` object
-   - `early_adopter_create_RouteGuide_stub`, which can be used by clients to create a stub object
+   - `beta_create_RouteGuide_server`, which creates a gRPC server given a `BetaRouteGuideServicer` object
+   - `beta_create_RouteGuide_stub`, which can be used by clients to create a stub object
 
 <a name="server"></a>
 ## Creating the server
@@ -119,11 +118,11 @@ You can find the example `RouteGuide` server in [route_guide_server.py](route_gu
 
 ### Implementing RouteGuide
 
-`route_guide_server.py` has a `RouteGuideServicer` class that implements the generated interface `route_guide_pb2.EarlyAdopterRouteGuideServicer`:
+`route_guide_server.py` has a `RouteGuideServicer` class that implements the generated interface `route_guide_pb2.BetaRouteGuideServicer`:
 
 ```python
 # RouteGuideServicer provides an implementation of the methods of the RouteGuide service.
-class RouteGuideServicer(route_guide_pb2.EarlyAdopterRouteGuideServicer):
+class RouteGuideServicer(route_guide_pb2.BetaRouteGuideServicer):
 ```
 
 `RouteGuideServicer` implements all the `RouteGuide` service methods.
@@ -141,7 +140,7 @@ Let's look at the simplest type first, `GetFeature`, which just gets a `Point` f
       return feature
 ```
 
-The method is passed a `route_guide_pb2.Point` request for the RPC, and an `RpcContext` object that provides RPC-specific information such as timeout limits. It returns a `route_guide_pb2.Feature` response.
+The method is passed a `route_guide_pb2.Point` request for the RPC, and a `ServicerContext` object that provides RPC-specific information such as timeout limits. It returns a `route_guide_pb2.Feature` response.
 
 #### Response-streaming RPC
 
@@ -212,8 +211,8 @@ Once you have implemented all the `RouteGuide` methods, the next step is to star
 
 ```python
 def serve():
-  server = route_guide_pb2.early_adopter_create_RouteGuide_server(
-      RouteGuideServicer(), 50051, None, None)
+  server = route_guide_pb2.beta_create_RouteGuide_server(RouteGuideServicer())
+  server.add_insecure_port('[::]:50051')
   server.start()
 ```
 
@@ -228,17 +227,14 @@ You can see the complete example client code in [route_guide_client.py](route_gu
 
 To call service methods, we first need to create a *stub*.
 
-We use the `early_adopter_create_RouteGuide_stub` function of the `route_guide_pb2` module, generated from our .proto.
+We use the `beta_create_RouteGuide_stub` function of the `route_guide_pb2` module, generated from our .proto.
 
 ```python
-stub = RouteGuide::Stub.new('localhost', 50051)
+channel = implementations.insecure_channel('localhost', 50051)
+stub = beta_create_RouteGuide_stub(channel)
 ```
 
-The returned object implements all the methods defined by the `EarlyAdopterRouteGuideStub` interface, and is also a [context manager](https://docs.python.org/2/library/stdtypes.html#typecontextmanager). All RPCs invoked on the stub must be invoked within the stub's context, so it is common for stubs to be created and used with a [with statement](https://docs.python.org/2/reference/compound_stmts.html#the-with-statement):
-
-```python
-with route_guide_pb2.early_adopter_create_RouteGuide_stub('localhost', 50051) as stub:
-```
+The returned object implements all the methods defined by the `BetaRouteGuideStub` interface.
 
 ### Calling service methods
 
@@ -255,7 +251,7 @@ feature = stub.GetFeature(point, timeout_in_seconds)
 An asynchronous call to `GetFeature` is similar, but like calling a local method asynchronously in a thread pool:
 
 ```python
-feature_future = stub.GetFeature.async(point, timeout_in_seconds)
+feature_future = stub.GetFeature.future(point, timeout_in_seconds)
 feature = feature_future.result()
 ```
 
@@ -276,7 +272,7 @@ route_summary = stub.RecordRoute(point_sequence, timeout_in_seconds)
 ```
 
 ```python
-route_summary_future = stub.RecordRoute.async(point_sequence, timeout_in_seconds)
+route_summary_future = stub.RecordRoute.future(point_sequence, timeout_in_seconds)
 route_summary = route_summary_future.result()
 ```
 
diff --git a/examples/python/route_guide/route_guide_client.py b/examples/python/route_guide/route_guide_client.py
index 078231543e..b1dfad551d 100755..100644
--- a/examples/python/route_guide/route_guide_client.py
+++ b/examples/python/route_guide/route_guide_client.py
@@ -32,6 +32,8 @@
 import random
 import time
 
+from grpc.beta import implementations
+
 import route_guide_pb2
 import route_guide_resources
 
@@ -115,15 +117,16 @@ def guide_route_chat(stub):
 
 
 def run():
-  with route_guide_pb2.early_adopter_create_RouteGuide_stub('localhost', 50051) as stub:
-    print "-------------- GetFeature --------------"
-    guide_get_feature(stub)
-    print "-------------- ListFeatures --------------"
-    guide_list_features(stub)
-    print "-------------- RecordRoute --------------"
-    guide_record_route(stub)
-    print "-------------- RouteChat --------------"
-    guide_route_chat(stub)
+  channel = implementations.insecure_channel('localhost', 50051)
+  stub = route_guide_pb2.beta_create_RouteGuide_stub(channel)
+  print "-------------- GetFeature --------------"
+  guide_get_feature(stub)
+  print "-------------- ListFeatures --------------"
+  guide_list_features(stub)
+  print "-------------- RecordRoute --------------"
+  guide_record_route(stub)
+  print "-------------- RouteChat --------------"
+  guide_route_chat(stub)
 
 
 if __name__ == '__main__':
diff --git a/examples/python/route_guide/route_guide_pb2.py b/examples/python/route_guide/route_guide_pb2.py
index 2a4532bb75..d4d9f8dcd5 100644
--- a/examples/python/route_guide/route_guide_pb2.py
+++ b/examples/python/route_guide/route_guide_pb2.py
@@ -1,8 +1,6 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: route_guide.proto
 
-import sys
-_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import message as _message
 from google.protobuf import reflection as _reflection
@@ -17,8 +15,9 @@ _sym_db = _symbol_database.Default()
 
 DESCRIPTOR = _descriptor.FileDescriptor(
   name='route_guide.proto',
-  package='',
-  serialized_pb=_b('\n\x11route_guide.proto\",\n\x05Point\x12\x10\n\x08latitude\x18\x01 \x01(\x05\x12\x11\n\tlongitude\x18\x02 \x01(\x05\"3\n\tRectangle\x12\x12\n\x02lo\x18\x01 \x01(\x0b\x32\x06.Point\x12\x12\n\x02hi\x18\x02 \x01(\x0b\x32\x06.Point\"1\n\x07\x46\x65\x61ture\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x18\n\x08location\x18\x02 \x01(\x0b\x32\x06.Point\"6\n\tRouteNote\x12\x18\n\x08location\x18\x01 \x01(\x0b\x32\x06.Point\x12\x0f\n\x07message\x18\x02 \x01(\t\"b\n\x0cRouteSummary\x12\x13\n\x0bpoint_count\x18\x01 \x01(\x05\x12\x15\n\rfeature_count\x18\x02 \x01(\x05\x12\x10\n\x08\x64istance\x18\x03 \x01(\x05\x12\x14\n\x0c\x65lapsed_time\x18\x04 \x01(\x05\x32\xad\x01\n\nRouteGuide\x12 \n\nGetFeature\x12\x06.Point\x1a\x08.Feature\"\x00\x12(\n\x0cListFeatures\x12\n.Rectangle\x1a\x08.Feature\"\x00\x30\x01\x12(\n\x0bRecordRoute\x12\x06.Point\x1a\r.RouteSummary\"\x00(\x01\x12)\n\tRouteChat\x12\n.RouteNote\x1a\n.RouteNote\"\x00(\x01\x30\x01')
+  package='routeguide',
+  syntax='proto3',
+  serialized_pb=b'\n\x11route_guide.proto\x12\nrouteguide\",\n\x05Point\x12\x10\n\x08latitude\x18\x01 \x01(\x05\x12\x11\n\tlongitude\x18\x02 \x01(\x05\"I\n\tRectangle\x12\x1d\n\x02lo\x18\x01 \x01(\x0b\x32\x11.routeguide.Point\x12\x1d\n\x02hi\x18\x02 \x01(\x0b\x32\x11.routeguide.Point\"<\n\x07\x46\x65\x61ture\x12\x0c\n\x04name\x18\x01 \x01(\t\x12#\n\x08location\x18\x02 \x01(\x0b\x32\x11.routeguide.Point\"A\n\tRouteNote\x12#\n\x08location\x18\x01 \x01(\x0b\x32\x11.routeguide.Point\x12\x0f\n\x07message\x18\x02 \x01(\t\"b\n\x0cRouteSummary\x12\x13\n\x0bpoint_count\x18\x01 \x01(\x05\x12\x15\n\rfeature_count\x18\x02 \x01(\x05\x12\x10\n\x08\x64istance\x18\x03 \x01(\x05\x12\x14\n\x0c\x65lapsed_time\x18\x04 \x01(\x05\x32\x85\x02\n\nRouteGuide\x12\x36\n\nGetFeature\x12\x11.routeguide.Point\x1a\x13.routeguide.Feature\"\x00\x12>\n\x0cListFeatures\x12\x15.routeguide.Rectangle\x1a\x13.routeguide.Feature\"\x00\x30\x01\x12>\n\x0bRecordRoute\x12\x11.routeguide.Point\x1a\x18.routeguide.RouteSummary\"\x00(\x01\x12?\n\tRouteChat\x12\x15.routeguide.RouteNote\x1a\x15.routeguide.RouteNote\"\x00(\x01\x30\x01\x42\x0f\n\x07\x65x.grpc\xa2\x02\x03RTGb\x06proto3'
 )
 _sym_db.RegisterFileDescriptor(DESCRIPTOR)
 
@@ -27,20 +26,20 @@ _sym_db.RegisterFileDescriptor(DESCRIPTOR)
 
 _POINT = _descriptor.Descriptor(
   name='Point',
-  full_name='Point',
+  full_name='routeguide.Point',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
     _descriptor.FieldDescriptor(
-      name='latitude', full_name='Point.latitude', index=0,
+      name='latitude', full_name='routeguide.Point.latitude', index=0,
       number=1, type=5, cpp_type=1, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
-      name='longitude', full_name='Point.longitude', index=1,
+      name='longitude', full_name='routeguide.Point.longitude', index=1,
       number=2, type=5, cpp_type=1, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
@@ -54,30 +53,31 @@ _POINT = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=21,
-  serialized_end=65,
+  serialized_start=33,
+  serialized_end=77,
 )
 
 
 _RECTANGLE = _descriptor.Descriptor(
   name='Rectangle',
-  full_name='Rectangle',
+  full_name='routeguide.Rectangle',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
     _descriptor.FieldDescriptor(
-      name='lo', full_name='Rectangle.lo', index=0,
+      name='lo', full_name='routeguide.Rectangle.lo', index=0,
       number=1, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
-      name='hi', full_name='Rectangle.hi', index=1,
+      name='hi', full_name='routeguide.Rectangle.hi', index=1,
       number=2, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
@@ -91,30 +91,31 @@ _RECTANGLE = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=67,
-  serialized_end=118,
+  serialized_start=79,
+  serialized_end=152,
 )
 
 
 _FEATURE = _descriptor.Descriptor(
   name='Feature',
-  full_name='Feature',
+  full_name='routeguide.Feature',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
     _descriptor.FieldDescriptor(
-      name='name', full_name='Feature.name', index=0,
+      name='name', full_name='routeguide.Feature.name', index=0,
       number=1, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b("").decode('utf-8'),
+      has_default_value=False, default_value=b"".decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
-      name='location', full_name='Feature.location', index=1,
+      name='location', full_name='routeguide.Feature.location', index=1,
       number=2, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
@@ -128,32 +129,33 @@ _FEATURE = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=120,
-  serialized_end=169,
+  serialized_start=154,
+  serialized_end=214,
 )
 
 
 _ROUTENOTE = _descriptor.Descriptor(
   name='RouteNote',
-  full_name='RouteNote',
+  full_name='routeguide.RouteNote',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
     _descriptor.FieldDescriptor(
-      name='location', full_name='RouteNote.location', index=0,
+      name='location', full_name='routeguide.RouteNote.location', index=0,
       number=1, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
-      name='message', full_name='RouteNote.message', index=1,
+      name='message', full_name='routeguide.RouteNote.message', index=1,
       number=2, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b("").decode('utf-8'),
+      has_default_value=False, default_value=b"".decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -165,44 +167,45 @@ _ROUTENOTE = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=171,
-  serialized_end=225,
+  serialized_start=216,
+  serialized_end=281,
 )
 
 
 _ROUTESUMMARY = _descriptor.Descriptor(
   name='RouteSummary',
-  full_name='RouteSummary',
+  full_name='routeguide.RouteSummary',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
     _descriptor.FieldDescriptor(
-      name='point_count', full_name='RouteSummary.point_count', index=0,
+      name='point_count', full_name='routeguide.RouteSummary.point_count', index=0,
       number=1, type=5, cpp_type=1, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
-      name='feature_count', full_name='RouteSummary.feature_count', index=1,
+      name='feature_count', full_name='routeguide.RouteSummary.feature_count', index=1,
       number=2, type=5, cpp_type=1, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
-      name='distance', full_name='RouteSummary.distance', index=2,
+      name='distance', full_name='routeguide.RouteSummary.distance', index=2,
       number=3, type=5, cpp_type=1, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
-      name='elapsed_time', full_name='RouteSummary.elapsed_time', index=3,
+      name='elapsed_time', full_name='routeguide.RouteSummary.elapsed_time', index=3,
       number=4, type=5, cpp_type=1, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
@@ -216,11 +219,12 @@ _ROUTESUMMARY = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=227,
-  serialized_end=325,
+  serialized_start=283,
+  serialized_end=381,
 )
 
 _RECTANGLE.fields_by_name['lo'].message_type = _POINT
@@ -236,58 +240,61 @@ DESCRIPTOR.message_types_by_name['RouteSummary'] = _ROUTESUMMARY
 Point = _reflection.GeneratedProtocolMessageType('Point', (_message.Message,), dict(
   DESCRIPTOR = _POINT,
   __module__ = 'route_guide_pb2'
-  # @@protoc_insertion_point(class_scope:Point)
+  # @@protoc_insertion_point(class_scope:routeguide.Point)
   ))
 _sym_db.RegisterMessage(Point)
 
 Rectangle = _reflection.GeneratedProtocolMessageType('Rectangle', (_message.Message,), dict(
   DESCRIPTOR = _RECTANGLE,
   __module__ = 'route_guide_pb2'
-  # @@protoc_insertion_point(class_scope:Rectangle)
+  # @@protoc_insertion_point(class_scope:routeguide.Rectangle)
   ))
 _sym_db.RegisterMessage(Rectangle)
 
 Feature = _reflection.GeneratedProtocolMessageType('Feature', (_message.Message,), dict(
   DESCRIPTOR = _FEATURE,
   __module__ = 'route_guide_pb2'
-  # @@protoc_insertion_point(class_scope:Feature)
+  # @@protoc_insertion_point(class_scope:routeguide.Feature)
   ))
 _sym_db.RegisterMessage(Feature)
 
 RouteNote = _reflection.GeneratedProtocolMessageType('RouteNote', (_message.Message,), dict(
   DESCRIPTOR = _ROUTENOTE,
   __module__ = 'route_guide_pb2'
-  # @@protoc_insertion_point(class_scope:RouteNote)
+  # @@protoc_insertion_point(class_scope:routeguide.RouteNote)
   ))
 _sym_db.RegisterMessage(RouteNote)
 
 RouteSummary = _reflection.GeneratedProtocolMessageType('RouteSummary', (_message.Message,), dict(
   DESCRIPTOR = _ROUTESUMMARY,
   __module__ = 'route_guide_pb2'
-  # @@protoc_insertion_point(class_scope:RouteSummary)
+  # @@protoc_insertion_point(class_scope:routeguide.RouteSummary)
   ))
 _sym_db.RegisterMessage(RouteSummary)
 
 
+DESCRIPTOR.has_options = True
+DESCRIPTOR._options = _descriptor._ParseOptions(descriptor_pb2.FileOptions(), b'\n\007ex.grpc\242\002\003RTG')
 import abc
-from grpc._adapter import fore
-from grpc._adapter import rear
-from grpc.framework.assembly import implementations
-from grpc.framework.assembly import utilities
+from grpc.beta import implementations as beta_implementations
+from grpc.early_adopter import implementations as early_adopter_implementations
+from grpc.framework.alpha import utilities as alpha_utilities
+from grpc.framework.common import cardinality
+from grpc.framework.interfaces.face import utilities as face_utilities
 class EarlyAdopterRouteGuideServicer(object):
   """<fill me in later!>"""
   __metaclass__ = abc.ABCMeta
   @abc.abstractmethod
-  def GetFeature(self, request):
+  def GetFeature(self, request, context):
     raise NotImplementedError()
   @abc.abstractmethod
-  def ListFeatures(self, request):
+  def ListFeatures(self, request, context):
     raise NotImplementedError()
   @abc.abstractmethod
-  def RecordRoute(self, request_iterator):
+  def RecordRoute(self, request_iterator, context):
     raise NotImplementedError()
   @abc.abstractmethod
-  def RouteChat(self, request_iterator):
+  def RouteChat(self, request_iterator, context):
     raise NotImplementedError()
 class EarlyAdopterRouteGuideServer(object):
   """<fill me in later!>"""
@@ -317,54 +324,158 @@ class EarlyAdopterRouteGuideStub(object):
   def RouteChat(self, request_iterator):
     raise NotImplementedError()
   RouteChat.async = None
-def early_adopter_create_RouteGuide_server(servicer, port, root_certificates, key_chain_pairs):
-  method_implementations = {
-    "GetFeature": utilities.unary_unary_inline(servicer.GetFeature),
-    "ListFeatures": utilities.unary_stream_inline(servicer.ListFeatures),
-    "RecordRoute": utilities.stream_unary_inline(servicer.RecordRoute),
-    "RouteChat": utilities.stream_stream_inline(servicer.RouteChat),
+def early_adopter_create_RouteGuide_server(servicer, port, private_key=None, certificate_chain=None):
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  method_service_descriptions = {
+    "GetFeature": alpha_utilities.unary_unary_service_description(
+      servicer.GetFeature,
+      route_guide_pb2.Point.FromString,
+      route_guide_pb2.Feature.SerializeToString,
+    ),
+    "ListFeatures": alpha_utilities.unary_stream_service_description(
+      servicer.ListFeatures,
+      route_guide_pb2.Rectangle.FromString,
+      route_guide_pb2.Feature.SerializeToString,
+    ),
+    "RecordRoute": alpha_utilities.stream_unary_service_description(
+      servicer.RecordRoute,
+      route_guide_pb2.Point.FromString,
+      route_guide_pb2.RouteSummary.SerializeToString,
+    ),
+    "RouteChat": alpha_utilities.stream_stream_service_description(
+      servicer.RouteChat,
+      route_guide_pb2.RouteNote.FromString,
+      route_guide_pb2.RouteNote.SerializeToString,
+    ),
+  }
+  return early_adopter_implementations.server("routeguide.RouteGuide", method_service_descriptions, port, private_key=private_key, certificate_chain=certificate_chain)
+def early_adopter_create_RouteGuide_stub(host, port, metadata_transformer=None, secure=False, root_certificates=None, private_key=None, certificate_chain=None, server_host_override=None):
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  method_invocation_descriptions = {
+    "GetFeature": alpha_utilities.unary_unary_invocation_description(
+      route_guide_pb2.Point.SerializeToString,
+      route_guide_pb2.Feature.FromString,
+    ),
+    "ListFeatures": alpha_utilities.unary_stream_invocation_description(
+      route_guide_pb2.Rectangle.SerializeToString,
+      route_guide_pb2.Feature.FromString,
+    ),
+    "RecordRoute": alpha_utilities.stream_unary_invocation_description(
+      route_guide_pb2.Point.SerializeToString,
+      route_guide_pb2.RouteSummary.FromString,
+    ),
+    "RouteChat": alpha_utilities.stream_stream_invocation_description(
+      route_guide_pb2.RouteNote.SerializeToString,
+      route_guide_pb2.RouteNote.FromString,
+    ),
   }
+  return early_adopter_implementations.stub("routeguide.RouteGuide", method_invocation_descriptions, host, port, metadata_transformer=metadata_transformer, secure=secure, root_certificates=root_certificates, private_key=private_key, certificate_chain=certificate_chain, server_host_override=server_host_override)
+
+class BetaRouteGuideServicer(object):
+  """<fill me in later!>"""
+  __metaclass__ = abc.ABCMeta
+  @abc.abstractmethod
+  def GetFeature(self, request, context):
+    raise NotImplementedError()
+  @abc.abstractmethod
+  def ListFeatures(self, request, context):
+    raise NotImplementedError()
+  @abc.abstractmethod
+  def RecordRoute(self, request_iterator, context):
+    raise NotImplementedError()
+  @abc.abstractmethod
+  def RouteChat(self, request_iterator, context):
+    raise NotImplementedError()
+
+class BetaRouteGuideStub(object):
+  """The interface to which stubs will conform."""
+  __metaclass__ = abc.ABCMeta
+  @abc.abstractmethod
+  def GetFeature(self, request, timeout):
+    raise NotImplementedError()
+  GetFeature.future = None
+  @abc.abstractmethod
+  def ListFeatures(self, request, timeout):
+    raise NotImplementedError()
+  @abc.abstractmethod
+  def RecordRoute(self, request_iterator, timeout):
+    raise NotImplementedError()
+  RecordRoute.future = None
+  @abc.abstractmethod
+  def RouteChat(self, request_iterator, timeout):
+    raise NotImplementedError()
+
+def beta_create_RouteGuide_server(servicer, pool=None, pool_size=None, default_timeout=None, maximum_timeout=None):
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
   import route_guide_pb2
   import route_guide_pb2
   import route_guide_pb2
   import route_guide_pb2
   request_deserializers = {
-    "GetFeature": route_guide_pb2.Point.FromString,
-    "ListFeatures": route_guide_pb2.Rectangle.FromString,
-    "RecordRoute": route_guide_pb2.Point.FromString,
-    "RouteChat": route_guide_pb2.RouteNote.FromString,
+    ('routeguide.RouteGuide', 'GetFeature'): route_guide_pb2.Point.FromString,
+    ('routeguide.RouteGuide', 'ListFeatures'): route_guide_pb2.Rectangle.FromString,
+    ('routeguide.RouteGuide', 'RecordRoute'): route_guide_pb2.Point.FromString,
+    ('routeguide.RouteGuide', 'RouteChat'): route_guide_pb2.RouteNote.FromString,
   }
   response_serializers = {
-    "GetFeature": lambda x: x.SerializeToString(),
-    "ListFeatures": lambda x: x.SerializeToString(),
-    "RecordRoute": lambda x: x.SerializeToString(),
-    "RouteChat": lambda x: x.SerializeToString(),
+    ('routeguide.RouteGuide', 'GetFeature'): route_guide_pb2.Feature.SerializeToString,
+    ('routeguide.RouteGuide', 'ListFeatures'): route_guide_pb2.Feature.SerializeToString,
+    ('routeguide.RouteGuide', 'RecordRoute'): route_guide_pb2.RouteSummary.SerializeToString,
+    ('routeguide.RouteGuide', 'RouteChat'): route_guide_pb2.RouteNote.SerializeToString,
   }
-  link = fore.activated_fore_link(port, request_deserializers, response_serializers, root_certificates, key_chain_pairs)
-  return implementations.assemble_service(method_implementations, link)
-def early_adopter_create_RouteGuide_stub(host, port):
   method_implementations = {
-    "GetFeature": utilities.unary_unary_inline(None),
-    "ListFeatures": utilities.unary_stream_inline(None),
-    "RecordRoute": utilities.stream_unary_inline(None),
-    "RouteChat": utilities.stream_stream_inline(None),
+    ('routeguide.RouteGuide', 'GetFeature'): face_utilities.unary_unary_inline(servicer.GetFeature),
+    ('routeguide.RouteGuide', 'ListFeatures'): face_utilities.unary_stream_inline(servicer.ListFeatures),
+    ('routeguide.RouteGuide', 'RecordRoute'): face_utilities.stream_unary_inline(servicer.RecordRoute),
+    ('routeguide.RouteGuide', 'RouteChat'): face_utilities.stream_stream_inline(servicer.RouteChat),
   }
+  server_options = beta_implementations.server_options(request_deserializers=request_deserializers, response_serializers=response_serializers, thread_pool=pool, thread_pool_size=pool_size, default_timeout=default_timeout, maximum_timeout=maximum_timeout)
+  return beta_implementations.server(method_implementations, options=server_options)
+
+def beta_create_RouteGuide_stub(channel, host=None, metadata_transformer=None, pool=None, pool_size=None):
   import route_guide_pb2
   import route_guide_pb2
   import route_guide_pb2
   import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  import route_guide_pb2
+  request_serializers = {
+    ('routeguide.RouteGuide', 'GetFeature'): route_guide_pb2.Point.SerializeToString,
+    ('routeguide.RouteGuide', 'ListFeatures'): route_guide_pb2.Rectangle.SerializeToString,
+    ('routeguide.RouteGuide', 'RecordRoute'): route_guide_pb2.Point.SerializeToString,
+    ('routeguide.RouteGuide', 'RouteChat'): route_guide_pb2.RouteNote.SerializeToString,
+  }
   response_deserializers = {
-    "GetFeature": route_guide_pb2.Feature.FromString,
-    "ListFeatures": route_guide_pb2.Feature.FromString,
-    "RecordRoute": route_guide_pb2.RouteSummary.FromString,
-    "RouteChat": route_guide_pb2.RouteNote.FromString,
+    ('routeguide.RouteGuide', 'GetFeature'): route_guide_pb2.Feature.FromString,
+    ('routeguide.RouteGuide', 'ListFeatures'): route_guide_pb2.Feature.FromString,
+    ('routeguide.RouteGuide', 'RecordRoute'): route_guide_pb2.RouteSummary.FromString,
+    ('routeguide.RouteGuide', 'RouteChat'): route_guide_pb2.RouteNote.FromString,
   }
-  request_serializers = {
-    "GetFeature": lambda x: x.SerializeToString(),
-    "ListFeatures": lambda x: x.SerializeToString(),
-    "RecordRoute": lambda x: x.SerializeToString(),
-    "RouteChat": lambda x: x.SerializeToString(),
+  cardinalities = {
+    'GetFeature': cardinality.Cardinality.UNARY_UNARY,
+    'ListFeatures': cardinality.Cardinality.UNARY_STREAM,
+    'RecordRoute': cardinality.Cardinality.STREAM_UNARY,
+    'RouteChat': cardinality.Cardinality.STREAM_STREAM,
   }
-  link = rear.activated_rear_link(host, port, request_serializers, response_deserializers)
-  return implementations.assemble_dynamic_inline_stub(method_implementations, link)
+  stub_options = beta_implementations.stub_options(host=host, metadata_transformer=metadata_transformer, request_serializers=request_serializers, response_deserializers=response_deserializers, thread_pool=pool, thread_pool_size=pool_size)
+  return beta_implementations.dynamic_stub(channel, 'routeguide.RouteGuide', cardinalities, options=stub_options)
 # @@protoc_insertion_point(module_scope)
diff --git a/examples/python/route_guide/route_guide_server.py b/examples/python/route_guide/route_guide_server.py
index 44bbacf5f3..f23b98bf36 100644
--- a/examples/python/route_guide/route_guide_server.py
+++ b/examples/python/route_guide/route_guide_server.py
@@ -65,7 +65,7 @@ def get_distance(start, end):
   R = 6371000; # metres
   return R * c;
 
-class RouteGuideServicer(route_guide_pb2.EarlyAdopterRouteGuideServicer):
+class RouteGuideServicer(route_guide_pb2.BetaRouteGuideServicer):
   """Provides methods that implement functionality of route guide server."""
 
   def __init__(self):
@@ -121,8 +121,8 @@ class RouteGuideServicer(route_guide_pb2.EarlyAdopterRouteGuideServicer):
 
 
 def serve():
-  server = route_guide_pb2.early_adopter_create_RouteGuide_server(
-      RouteGuideServicer(), 50051, None, None)
+  server = route_guide_pb2.beta_create_RouteGuide_server(RouteGuideServicer())
+  server.add_insecure_port('[::]:50051')
   server.start()
   try:
     while True:
diff --git a/examples/python/route_guide/run_codegen.sh b/examples/python/route_guide/run_codegen.sh
index 689e0978de..a5759025b8 100755
--- a/examples/python/route_guide/run_codegen.sh
+++ b/examples/python/route_guide/run_codegen.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 
 # Runs the protoc with gRPC plugin to generate protocol messages and gRPC stubs.
-protoc -I . --python_out=. --grpc_out=. --plugin=protoc-gen-grpc=`which grpc_python_plugin` route_guide.proto
+protoc -I ../../protos --python_out=. --grpc_out=. --plugin=protoc-gen-grpc=`which grpc_python_plugin` ../../protos/route_guide.proto
diff --git a/include/grpc++/server.h b/include/grpc++/server.h
index 18a8017880..210fe020ad 100644
--- a/include/grpc++/server.h
+++ b/include/grpc++/server.h
@@ -37,6 +37,7 @@
 #include <list>
 #include <memory>
 
+#include <grpc/compression.h>
 #include <grpc++/completion_queue.h>
 #include <grpc++/impl/call.h>
 #include <grpc++/impl/grpc_library.h>
@@ -99,7 +100,7 @@ class Server GRPC_FINAL : public GrpcLibrary, private CallHook {
   /// \param max_message_size Maximum message length that the channel can
   /// receive.
   Server(ThreadPoolInterface* thread_pool, bool thread_pool_owned,
-         int max_message_size);
+         int max_message_size, grpc_compression_options compression_options);
 
   /// Register a service. This call does not take ownership of the service.
   /// The service must exist for the lifetime of the Server instance.
diff --git a/include/grpc++/server_builder.h b/include/grpc++/server_builder.h
index 496e7862c5..05937f150b 100644
--- a/include/grpc++/server_builder.h
+++ b/include/grpc++/server_builder.h
@@ -37,6 +37,7 @@
 #include <memory>
 #include <vector>
 
+#include <grpc/compression.h>
 #include <grpc++/support/config.h>
 
 namespace grpc {
@@ -92,6 +93,11 @@ class ServerBuilder {
     max_message_size_ = max_message_size;
   }
 
+  /// Set the compression options to be used by the server.
+  void SetCompressionOptions(const grpc_compression_options& options) {
+    compression_options_ = options;
+  }
+
   /// Tries to bind \a server to the given \a addr.
   ///
   /// It can be invoked multiple times.
@@ -133,6 +139,7 @@ class ServerBuilder {
   };
 
   int max_message_size_;
+  grpc_compression_options compression_options_;
   std::vector<std::unique_ptr<NamedService<RpcService>>> services_;
   std::vector<std::unique_ptr<NamedService<AsynchronousService>>>
       async_services_;
diff --git a/include/grpc/support/port_platform.h b/include/grpc/support/port_platform.h
index d09815557e..93291a174d 100644
--- a/include/grpc/support/port_platform.h
+++ b/include/grpc/support/port_platform.h
@@ -179,6 +179,7 @@
 #ifndef _BSD_SOURCE
 #define _BSD_SOURCE
 #endif
+#define GPR_MSG_IOVLEN_TYPE int
 #if TARGET_OS_IPHONE
 #define GPR_PLATFORM_STRING "ios"
 #define GPR_CPU_IPHONE 1
@@ -318,6 +319,7 @@ typedef uintptr_t gpr_uintptr;
 
 /* INT64_MAX is unavailable on some platforms. */
 #define GPR_INT64_MAX (gpr_int64)(~(gpr_uint64)0 >> 1)
+#define GPR_UINT32_MAX (~(gpr_uint32)0)
 
 /* maximum alignment needed for any type on this platform, rounded up to a
    power of two */
diff --git a/include/grpc/support/slice_buffer.h b/include/grpc/support/slice_buffer.h
index 04db003ac5..321ba288fd 100644
--- a/include/grpc/support/slice_buffer.h
+++ b/include/grpc/support/slice_buffer.h
@@ -77,7 +77,7 @@ size_t gpr_slice_buffer_add_indexed(gpr_slice_buffer *sb, gpr_slice slice);
 void gpr_slice_buffer_addn(gpr_slice_buffer *sb, gpr_slice *slices, size_t n);
 /* add a very small (less than 8 bytes) amount of data to the end of a slice
    buffer: returns a pointer into which to add the data */
-gpr_uint8 *gpr_slice_buffer_tiny_add(gpr_slice_buffer *sb, unsigned len);
+gpr_uint8 *gpr_slice_buffer_tiny_add(gpr_slice_buffer *sb, size_t len);
 /* pop the last buffer, but don't unref it */
 void gpr_slice_buffer_pop(gpr_slice_buffer *sb);
 /* clear a slice buffer, unref all elements */
diff --git a/src/compiler/python_generator.cc b/src/compiler/python_generator.cc
index fe2b9fad99..83133f2b6e 100644
--- a/src/compiler/python_generator.cc
+++ b/src/compiler/python_generator.cc
@@ -339,7 +339,7 @@ bool PrintAlphaServerFactory(const grpc::string& package_qualified_service_name,
     }
     out->Print("}\n");
     out->Print(
-        "return implementations.server("
+        "return early_adopter_implementations.server("
         "\"$PackageQualifiedServiceName$\","
         " method_service_descriptions, port, private_key=private_key,"
         " certificate_chain=certificate_chain)\n",
@@ -422,7 +422,7 @@ bool PrintAlphaStubFactory(const grpc::string& package_qualified_service_name,
     }
     out->Print("}\n");
     out->Print(
-        "return implementations.stub("
+        "return early_adopter_implementations.stub("
         "\"$PackageQualifiedServiceName$\","
         " method_invocation_descriptions, host, port,"
         " metadata_transformer=metadata_transformer, secure=secure,"
@@ -586,13 +586,13 @@ bool PrintBetaServerFactory(const grpc::string& package_qualified_service_name,
                  "Constructor", name_and_implementation_constructor->second);
     }
     out->Print("}\n");
-    out->Print("server_options = beta.server_options("
+    out->Print("server_options = beta_implementations.server_options("
                "request_deserializers=request_deserializers, "
                "response_serializers=response_serializers, "
                "thread_pool=pool, thread_pool_size=pool_size, "
                "default_timeout=default_timeout, "
                "maximum_timeout=maximum_timeout)\n");
-    out->Print("return beta.server(method_implementations, "
+    out->Print("return beta_implementations.server(method_implementations, "
                "options=server_options)\n");
   }
   return true;
@@ -685,13 +685,13 @@ bool PrintBetaStubFactory(const grpc::string& package_qualified_service_name,
                  "Cardinality", name_and_cardinality->second);
     }
     out->Print("}\n");
-    out->Print("stub_options = beta.stub_options("
+    out->Print("stub_options = beta_implementations.stub_options("
                "host=host, metadata_transformer=metadata_transformer, "
                "request_serializers=request_serializers, "
                "response_deserializers=response_deserializers, "
                "thread_pool=pool, thread_pool_size=pool_size)\n");
     out->Print(
-        "return beta.dynamic_stub(channel, \'$PackageQualifiedServiceName$\', "
+        "return beta_implementations.dynamic_stub(channel, \'$PackageQualifiedServiceName$\', "
         "cardinalities, options=stub_options)\n",
         "PackageQualifiedServiceName", package_qualified_service_name);
   }
@@ -701,9 +701,9 @@ bool PrintBetaStubFactory(const grpc::string& package_qualified_service_name,
 bool PrintPreamble(const FileDescriptor* file,
                    const GeneratorConfiguration& config, Printer* out) {
   out->Print("import abc\n");
-  out->Print("from $Package$ import beta\n",
+  out->Print("from $Package$ import implementations as beta_implementations\n",
              "Package", config.beta_package_root);
-  out->Print("from $Package$ import implementations\n",
+  out->Print("from $Package$ import implementations as early_adopter_implementations\n",
              "Package", config.early_adopter_package_root);
   out->Print("from grpc.framework.alpha import utilities as alpha_utilities\n");
   out->Print("from grpc.framework.common import cardinality\n");
diff --git a/src/core/channel/channel_args.c b/src/core/channel/channel_args.c
index 54ee75af28..591135cd6f 100644
--- a/src/core/channel/channel_args.c
+++ b/src/core/channel/channel_args.c
@@ -132,7 +132,7 @@ grpc_compression_algorithm grpc_channel_args_get_compression_algorithm(
   for (i = 0; i < a->num_args; ++i) {
     if (a->args[i].type == GRPC_ARG_INTEGER &&
         !strcmp(GRPC_COMPRESSION_ALGORITHM_ARG, a->args[i].key)) {
-      return a->args[i].value.integer;
+      return (grpc_compression_algorithm)a->args[i].value.integer;
       break;
     }
   }
@@ -177,9 +177,9 @@ grpc_channel_args *grpc_channel_args_compression_algorithm_set_state(
 
   if (states_arg_found) {
     if (state != 0) {
-      GPR_BITSET(states_arg, algorithm);
+      GPR_BITSET((unsigned *)states_arg, algorithm);
     } else {
-      GPR_BITCLEAR(states_arg, algorithm);
+      GPR_BITCLEAR((unsigned *)states_arg, algorithm);
     }
   } else {
     /* create a new arg */
@@ -189,9 +189,9 @@ grpc_channel_args *grpc_channel_args_compression_algorithm_set_state(
     /* all enabled by default */
     tmp.value.integer = (1u << GRPC_COMPRESS_ALGORITHMS_COUNT) - 1;
     if (state != 0) {
-      GPR_BITSET(&tmp.value.integer, algorithm);
+      GPR_BITSET((unsigned *)&tmp.value.integer, algorithm);
     } else {
-      GPR_BITCLEAR(&tmp.value.integer, algorithm);
+      GPR_BITCLEAR((unsigned *)&tmp.value.integer, algorithm);
     }
     result = grpc_channel_args_copy_and_add(*a, &tmp, 1);
     grpc_channel_args_destroy(*a);
diff --git a/src/core/channel/channel_stack.c b/src/core/channel/channel_stack.c
index cd7c182ef2..4eb5df5de3 100644
--- a/src/core/channel/channel_stack.c
+++ b/src/core/channel/channel_stack.c
@@ -57,7 +57,7 @@ int grpc_trace_channel = 0;
 
 /* Given a size, round up to the next multiple of sizeof(void*) */
 #define ROUND_UP_TO_ALIGNMENT_SIZE(x) \
-  (((x) + GPR_MAX_ALIGNMENT - 1) & ~(GPR_MAX_ALIGNMENT - 1))
+  (((x) + GPR_MAX_ALIGNMENT - 1u) & ~(GPR_MAX_ALIGNMENT - 1u))
 
 size_t grpc_channel_stack_size(const grpc_channel_filter **filters,
                                size_t filter_count) {
diff --git a/src/core/channel/compress_filter.c b/src/core/channel/compress_filter.c
index 762a4edc73..7959603102 100644
--- a/src/core/channel/compress_filter.c
+++ b/src/core/channel/compress_filter.c
@@ -48,7 +48,8 @@ typedef struct call_data {
   gpr_slice_buffer slices; /**< Buffers up input slices to be compressed */
   grpc_linked_mdelem compression_algorithm_storage;
   grpc_linked_mdelem accept_encoding_storage;
-  int remaining_slice_bytes; /**< Input data to be read, as per BEGIN_MESSAGE */
+  gpr_uint32
+      remaining_slice_bytes; /**< Input data to be read, as per BEGIN_MESSAGE */
   int written_initial_metadata; /**< Already processed initial md? */
   /** Compression algorithm we'll try to use. It may be given by incoming
    * metadata, or by the channel's default compression settings. */
@@ -70,6 +71,8 @@ typedef struct channel_data {
   grpc_mdelem *mdelem_accept_encoding;
   /** The default, channel-level, compression algorithm */
   grpc_compression_algorithm default_compression_algorithm;
+  /** Compression options for the channel */
+  grpc_compression_options compression_options;
 } channel_data;
 
 /** Compress \a slices in place using \a algorithm. Returns 1 if compression did
@@ -102,7 +105,17 @@ static grpc_mdelem *compression_md_filter(void *user_data, grpc_mdelem *md) {
     const char *md_c_str = grpc_mdstr_as_c_string(md->value);
     if (!grpc_compression_algorithm_parse(md_c_str, strlen(md_c_str),
                                           &calld->compression_algorithm)) {
-      gpr_log(GPR_ERROR, "Invalid compression algorithm: '%s'. Ignoring.",
+      gpr_log(GPR_ERROR,
+              "Invalid compression algorithm: '%s' (unknown). Ignoring.",
+              md_c_str);
+      calld->compression_algorithm = GRPC_COMPRESS_NONE;
+    }
+    if (grpc_compression_options_is_algorithm_enabled(
+            &channeld->compression_options, calld->compression_algorithm) ==
+        0) {
+      gpr_log(GPR_ERROR,
+              "Invalid compression algorithm: '%s' (previously disabled). "
+              "Ignoring.",
               md_c_str);
       calld->compression_algorithm = GRPC_COMPRESS_NONE;
     }
@@ -141,8 +154,9 @@ static void finish_compressed_sopb(grpc_stream_op_buffer *send_ops,
     grpc_stream_op *sop = &send_ops->ops[i];
     switch (sop->type) {
       case GRPC_OP_BEGIN_MESSAGE:
+        GPR_ASSERT(calld->slices.length <= GPR_UINT32_MAX);
         grpc_sopb_add_begin_message(
-            &new_send_ops, calld->slices.length,
+            &new_send_ops, (gpr_uint32)calld->slices.length,
             sop->data.begin_message.flags | GRPC_WRITE_INTERNAL_COMPRESS);
         break;
       case GRPC_OP_SLICE:
@@ -228,7 +242,10 @@ static void process_send_ops(grpc_call_element *elem,
         GPR_ASSERT(calld->remaining_slice_bytes > 0);
         /* Increase input ref count, gpr_slice_buffer_add takes ownership.  */
         gpr_slice_buffer_add(&calld->slices, gpr_slice_ref(sop->data.slice));
-        calld->remaining_slice_bytes -= GPR_SLICE_LENGTH(sop->data.slice);
+        GPR_ASSERT(GPR_SLICE_LENGTH(sop->data.slice) >=
+                   calld->remaining_slice_bytes);
+        calld->remaining_slice_bytes -=
+            (gpr_uint32)GPR_SLICE_LENGTH(sop->data.slice);
         if (calld->remaining_slice_bytes == 0) {
           did_compress =
               compress_send_sb(calld->compression_algorithm, &calld->slices);
@@ -294,11 +311,21 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
   channel_data *channeld = elem->channel_data;
   grpc_compression_algorithm algo_idx;
   const char *supported_algorithms_names[GRPC_COMPRESS_ALGORITHMS_COUNT - 1];
+  size_t supported_algorithms_idx = 0;
   char *accept_encoding_str;
   size_t accept_encoding_str_len;
 
+  grpc_compression_options_init(&channeld->compression_options);
+  channeld->compression_options.enabled_algorithms_bitset =
+      (gpr_uint32)grpc_channel_args_compression_algorithm_get_states(args);
+
   channeld->default_compression_algorithm =
       grpc_channel_args_get_compression_algorithm(args);
+  /* Make sure the default isn't disabled. */
+  GPR_ASSERT(grpc_compression_options_is_algorithm_enabled(
+      &channeld->compression_options, channeld->default_compression_algorithm));
+  channeld->compression_options.default_compression_algorithm =
+      channeld->default_compression_algorithm;
 
   channeld->mdstr_request_compression_algorithm_key =
       grpc_mdstr_from_string(mdctx, GRPC_COMPRESS_REQUEST_ALGORITHM_KEY, 0);
@@ -311,6 +338,11 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
 
   for (algo_idx = 0; algo_idx < GRPC_COMPRESS_ALGORITHMS_COUNT; ++algo_idx) {
     char *algorithm_name;
+    /* skip disabled algorithms */
+    if (grpc_compression_options_is_algorithm_enabled(
+            &channeld->compression_options, algo_idx) == 0) {
+      continue;
+    }
     GPR_ASSERT(grpc_compression_algorithm_name(algo_idx, &algorithm_name) != 0);
     channeld->mdelem_compression_algorithms[algo_idx] =
         grpc_mdelem_from_metadata_strings(
@@ -318,15 +350,15 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
             GRPC_MDSTR_REF(channeld->mdstr_outgoing_compression_algorithm_key),
             grpc_mdstr_from_string(mdctx, algorithm_name, 0));
     if (algo_idx > 0) {
-      supported_algorithms_names[algo_idx - 1] = algorithm_name;
+      supported_algorithms_names[supported_algorithms_idx++] = algorithm_name;
     }
   }
 
   /* TODO(dgq): gpr_strjoin_sep could be made to work with statically allocated
    * arrays, as to avoid the heap allocs */
-  accept_encoding_str = gpr_strjoin_sep(
-      supported_algorithms_names, GPR_ARRAY_SIZE(supported_algorithms_names),
-      ", ", &accept_encoding_str_len);
+  accept_encoding_str =
+      gpr_strjoin_sep(supported_algorithms_names, supported_algorithms_idx, ",",
+                      &accept_encoding_str_len);
 
   channeld->mdelem_accept_encoding = grpc_mdelem_from_metadata_strings(
       mdctx, GRPC_MDSTR_REF(channeld->mdstr_compression_capabilities_key),
diff --git a/src/core/channel/http_client_filter.c b/src/core/channel/http_client_filter.c
index 2b61d33c29..ec832a0367 100644
--- a/src/core/channel/http_client_filter.c
+++ b/src/core/channel/http_client_filter.c
@@ -85,16 +85,14 @@ static grpc_mdelem *client_filter(void *user_data, grpc_mdelem *md) {
 static void hc_on_recv(void *user_data, int success) {
   grpc_call_element *elem = user_data;
   call_data *calld = elem->call_data;
-  if (success) {
-    size_t i;
-    size_t nops = calld->recv_ops->nops;
-    grpc_stream_op *ops = calld->recv_ops->ops;
-    for (i = 0; i < nops; i++) {
-      grpc_stream_op *op = &ops[i];
-      if (op->type != GRPC_OP_METADATA) continue;
-      calld->got_initial_metadata = 1;
-      grpc_metadata_batch_filter(&op->data.metadata, client_filter, elem);
-    }
+  size_t i;
+  size_t nops = calld->recv_ops->nops;
+  grpc_stream_op *ops = calld->recv_ops->ops;
+  for (i = 0; i < nops; i++) {
+    grpc_stream_op *op = &ops[i];
+    if (op->type != GRPC_OP_METADATA) continue;
+    calld->got_initial_metadata = 1;
+    grpc_metadata_batch_filter(&op->data.metadata, client_filter, elem);
   }
   calld->on_done_recv->cb(calld->on_done_recv->cb_arg, success);
 }
diff --git a/src/core/client_config/connector.h b/src/core/client_config/connector.h
index edcb10a36e..39f3467990 100644
--- a/src/core/client_config/connector.h
+++ b/src/core/client_config/connector.h
@@ -50,7 +50,7 @@ typedef struct {
   grpc_pollset_set *interested_parties;
   /** address to connect to */
   const struct sockaddr *addr;
-  int addr_len;
+  size_t addr_len;
   /** deadline for connection */
   gpr_timespec deadline;
   /** channel arguments (to be passed to transport) */
diff --git a/src/core/client_config/lb_policies/round_robin.c b/src/core/client_config/lb_policies/round_robin.c
index ea15d1dce0..39fb2bc401 100644
--- a/src/core/client_config/lb_policies/round_robin.c
+++ b/src/core/client_config/lb_policies/round_robin.c
@@ -496,29 +496,28 @@ static void round_robin_factory_ref(grpc_lb_policy_factory *factory) {}
 static void round_robin_factory_unref(grpc_lb_policy_factory *factory) {}
 
 static grpc_lb_policy *create_round_robin(grpc_lb_policy_factory *factory,
-                                         grpc_subchannel **subchannels,
-                                         size_t num_subchannels) {
+                                          grpc_lb_policy_args *args) {
   size_t i;
   round_robin_lb_policy *p = gpr_malloc(sizeof(*p));
-  GPR_ASSERT(num_subchannels);
+  GPR_ASSERT(args->num_subchannels > 0);
   memset(p, 0, sizeof(*p));
   grpc_lb_policy_init(&p->base, &round_robin_lb_policy_vtable);
-  p->subchannels = gpr_malloc(sizeof(grpc_subchannel *) * num_subchannels);
-  p->num_subchannels = num_subchannels;
+  p->subchannels = gpr_malloc(sizeof(grpc_subchannel *) * args->num_subchannels);
+  p->num_subchannels = args->num_subchannels;
   grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
                                "round_robin");
-  memcpy(p->subchannels, subchannels,
-         sizeof(grpc_subchannel *) * num_subchannels);
+  memcpy(p->subchannels, args->subchannels,
+         sizeof(grpc_subchannel *) * args->num_subchannels);
 
   gpr_mu_init(&p->mu);
   p->connectivity_changed_cbs =
-      gpr_malloc(sizeof(grpc_iomgr_closure) * num_subchannels);
+      gpr_malloc(sizeof(grpc_iomgr_closure) * args->num_subchannels);
   p->subchannel_connectivity =
-      gpr_malloc(sizeof(grpc_connectivity_state) * num_subchannels);
+      gpr_malloc(sizeof(grpc_connectivity_state) * args->num_subchannels);
 
   p->cb_args =
-      gpr_malloc(sizeof(connectivity_changed_cb_arg) * num_subchannels);
-  for(i = 0; i < num_subchannels; i++) {
+      gpr_malloc(sizeof(connectivity_changed_cb_arg) * args->num_subchannels);
+  for(i = 0; i < args->num_subchannels; i++) {
     p->cb_args[i].subchannel_idx = i;
     p->cb_args[i].p = p;
     grpc_iomgr_closure_init(&p->connectivity_changed_cbs[i],
@@ -532,9 +531,9 @@ static grpc_lb_policy *create_round_robin(grpc_lb_policy_factory *factory,
   p->ready_list_last_pick = &p->ready_list;
 
   p->subchannel_index_to_readylist_node =
-      gpr_malloc(sizeof(grpc_subchannel *) * num_subchannels);
+      gpr_malloc(sizeof(grpc_subchannel *) * args->num_subchannels);
   memset(p->subchannel_index_to_readylist_node, 0,
-         sizeof(grpc_subchannel *) * num_subchannels);
+         sizeof(grpc_subchannel *) * args->num_subchannels);
   return &p->base;
 }
 
diff --git a/src/core/client_config/resolvers/dns_resolver.c b/src/core/client_config/resolvers/dns_resolver.c
index c389f46c26..ccec07a08c 100644
--- a/src/core/client_config/resolvers/dns_resolver.c
+++ b/src/core/client_config/resolvers/dns_resolver.c
@@ -140,7 +140,7 @@ static void dns_on_resolved(void *arg, grpc_resolved_addresses *addresses) {
     for (i = 0; i < addresses->naddrs; i++) {
       memset(&args, 0, sizeof(args));
       args.addr = (struct sockaddr *)(addresses->addrs[i].addr);
-      args.addr_len = addresses->addrs[i].len;
+      args.addr_len = (size_t)addresses->addrs[i].len;
       subchannels[i] = grpc_subchannel_factory_create_subchannel(
           r->subchannel_factory, &args);
     }
diff --git a/src/core/client_config/resolvers/sockaddr_resolver.c b/src/core/client_config/resolvers/sockaddr_resolver.c
index 88dd5d624b..ea2df07035 100644
--- a/src/core/client_config/resolvers/sockaddr_resolver.c
+++ b/src/core/client_config/resolvers/sockaddr_resolver.c
@@ -62,7 +62,7 @@ typedef struct {
   /** the addresses that we've 'resolved' */
   struct sockaddr_storage *addrs;
   /** the corresponding length of the addresses */
-  int *addrs_len;
+  size_t *addrs_len;
   /** how many elements in \a addrs */
   size_t num_addrs;
 
@@ -161,7 +161,8 @@ static void sockaddr_destroy(grpc_resolver *gr) {
 }
 
 #ifdef GPR_POSIX_SOCKET
-static int parse_unix(grpc_uri *uri, struct sockaddr_storage *addr, int *len) {
+static int parse_unix(grpc_uri *uri, struct sockaddr_storage *addr,
+                      size_t *len) {
   struct sockaddr_un *un = (struct sockaddr_un *)addr;
 
   un->sun_family = AF_UNIX;
@@ -193,7 +194,8 @@ static char *ipv6_get_default_authority(grpc_resolver_factory *factory,
   return ip_get_default_authority(uri);
 }
 
-static int parse_ipv4(grpc_uri *uri, struct sockaddr_storage *addr, int *len) {
+static int parse_ipv4(grpc_uri *uri, struct sockaddr_storage *addr,
+                      size_t *len) {
   const char *host_port = uri->path;
   char *host;
   char *port;
@@ -220,7 +222,7 @@ static int parse_ipv4(grpc_uri *uri, struct sockaddr_storage *addr, int *len) {
       gpr_log(GPR_ERROR, "invalid ipv4 port: '%s'", port);
       goto done;
     }
-    in->sin_port = htons(port_num);
+    in->sin_port = htons((gpr_uint16)port_num);
   } else {
     gpr_log(GPR_ERROR, "no port given for ipv4 scheme");
     goto done;
@@ -233,7 +235,8 @@ done:
   return result;
 }
 
-static int parse_ipv6(grpc_uri *uri, struct sockaddr_storage *addr, int *len) {
+static int parse_ipv6(grpc_uri *uri, struct sockaddr_storage *addr,
+                      size_t *len) {
   const char *host_port = uri->path;
   char *host;
   char *port;
@@ -260,7 +263,7 @@ static int parse_ipv6(grpc_uri *uri, struct sockaddr_storage *addr, int *len) {
       gpr_log(GPR_ERROR, "invalid ipv6 port: '%s'", port);
       goto done;
     }
-    in6->sin6_port = htons(port_num);
+    in6->sin6_port = htons((gpr_uint16)port_num);
   } else {
     gpr_log(GPR_ERROR, "no port given for ipv6 scheme");
     goto done;
@@ -277,7 +280,7 @@ static void do_nothing(void *ignored) {}
 static grpc_resolver *sockaddr_create(
     grpc_uri *uri, const char *default_lb_policy_name,
     grpc_subchannel_factory *subchannel_factory,
-    int parse(grpc_uri *uri, struct sockaddr_storage *dst, int *len)) {
+    int parse(grpc_uri *uri, struct sockaddr_storage *dst, size_t *len)) {
   size_t i;
   int errors_found = 0; /* GPR_FALSE */
   sockaddr_resolver *r;
@@ -317,7 +320,7 @@ static grpc_resolver *sockaddr_create(
   gpr_slice_split(path_slice, ",", &path_parts);
   r->num_addrs = path_parts.count;
   r->addrs = gpr_malloc(sizeof(struct sockaddr_storage) * r->num_addrs);
-  r->addrs_len = gpr_malloc(sizeof(int) * r->num_addrs);
+  r->addrs_len = gpr_malloc(sizeof(*r->addrs_len) * r->num_addrs);
 
   for(i = 0; i < r->num_addrs; i++) {
     grpc_uri ith_uri = *uri;
diff --git a/src/core/client_config/resolvers/zookeeper_resolver.c b/src/core/client_config/resolvers/zookeeper_resolver.c
index 8b89100245..e425913cd0 100644
--- a/src/core/client_config/resolvers/zookeeper_resolver.c
+++ b/src/core/client_config/resolvers/zookeeper_resolver.c
@@ -244,7 +244,7 @@ static void zookeeper_dns_resolved(void *arg,
 }
 
 /** Parses JSON format address of a zookeeper node */
-static char *zookeeper_parse_address(const char *value, int value_len) {
+static char *zookeeper_parse_address(const char *value, size_t value_len) {
   grpc_json *json;
   grpc_json *cur;
   const char *host;
@@ -294,7 +294,7 @@ static void zookeeper_get_children_node_completion(int rc, const char *value,
     return;
   }
 
-  address = zookeeper_parse_address(value, value_len);
+  address = zookeeper_parse_address(value, (size_t)value_len);
   if (address != NULL) {
     /** Further resolves address by DNS */
     grpc_resolve_address(address, NULL, zookeeper_dns_resolved, r);
@@ -364,7 +364,7 @@ static void zookeeper_get_node_completion(int rc, const char *value,
 
   /** If zookeeper node of path r->name does not have address
       (i.e. service node), get its children */
-  address = zookeeper_parse_address(value, value_len);
+  address = zookeeper_parse_address(value, (size_t)value_len);
   if (address != NULL) {
     r->resolved_addrs = gpr_malloc(sizeof(grpc_resolved_addresses));
     r->resolved_addrs->addrs = NULL;
diff --git a/src/core/client_config/uri_parser.c b/src/core/client_config/uri_parser.c
index 36ecfa5e8e..2738e2df57 100644
--- a/src/core/client_config/uri_parser.c
+++ b/src/core/client_config/uri_parser.c
@@ -39,10 +39,13 @@
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 
-static grpc_uri *bad_uri(const char *uri_text, int pos, const char *section,
+/** a size_t default value... maps to all 1's */
+#define NOT_SET (~(size_t)0)
+
+static grpc_uri *bad_uri(const char *uri_text, size_t pos, const char *section,
                          int suppress_errors) {
   char *line_prefix;
-  int pfx_len;
+  size_t pfx_len;
 
   if (!suppress_errors) {
     gpr_asprintf(&line_prefix, "bad uri.%s: '", section);
@@ -61,7 +64,7 @@ static grpc_uri *bad_uri(const char *uri_text, int pos, const char *section,
 }
 
 /** Returns a copy of \a src[begin, end) */
-static char *copy_component(const char *src, int begin, int end) {
+static char *copy_component(const char *src, size_t begin, size_t end) {
   char *out = gpr_malloc(end - begin + 1);
   memcpy(out, src + begin, end - begin);
   out[end - begin] = 0;
@@ -70,35 +73,33 @@ static char *copy_component(const char *src, int begin, int end) {
 
 /** Returns how many chars to advance if \a uri_text[i] begins a valid \a pchar
  * production. If \a uri_text[i] introduces an invalid \a pchar (such as percent
- * sign not followed by two hex digits), -1 is returned. */
-static int parse_pchar(const char *uri_text, int i) {
+ * sign not followed by two hex digits), NOT_SET is returned. */
+static size_t parse_pchar(const char *uri_text, size_t i) {
   /* pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
    * unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
    * pct-encoded = "%" HEXDIG HEXDIG
    * sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
                 / "*" / "+" / "," / ";" / "=" */
   char c = uri_text[i];
-  if ( ((c >= 'A') && (c <= 'Z')) ||
-       ((c >= 'a') && (c <= 'z')) ||
-       ((c >= '0') && (c <= '9')) ||
-       (c == '-' || c == '.' || c == '_' || c == '~') || /* unreserved */
-
-       (c == '!' || c == '$' || c == '&' || c == '\'' || c == '$' || c == '&' ||
-        c == '(' || c == ')' || c == '*' || c == '+' || c == ',' || c == ';' ||
-        c == '=') /* sub-delims */ ) {
+  if (((c >= 'A') && (c <= 'Z')) || ((c >= 'a') && (c <= 'z')) ||
+      ((c >= '0') && (c <= '9')) ||
+      (c == '-' || c == '.' || c == '_' || c == '~') || /* unreserved */
+
+      (c == '!' || c == '$' || c == '&' || c == '\'' || c == '$' || c == '&' ||
+       c == '(' || c == ')' || c == '*' || c == '+' || c == ',' || c == ';' ||
+       c == '=') /* sub-delims */) {
     return 1;
   }
   if (c == '%') { /* pct-encoded */
-    int j;
-    if (uri_text[i+1] == 0 || uri_text[i+2] == 0) {
-      return -1;
+    size_t j;
+    if (uri_text[i + 1] == 0 || uri_text[i + 2] == 0) {
+      return NOT_SET;
     }
     for (j = i + 1; j < 2; j++) {
       c = uri_text[j];
-      if (!(((c >= '0') && (c <= '9')) ||
-            ((c >= 'a') && (c <= 'f')) ||
+      if (!(((c >= '0') && (c <= '9')) || ((c >= 'a') && (c <= 'f')) ||
             ((c >= 'A') && (c <= 'F')))) {
-        return -1;
+        return NOT_SET;
       }
     }
     return 2;
@@ -107,46 +108,45 @@ static int parse_pchar(const char *uri_text, int i) {
 }
 
 /* *( pchar / "?" / "/" ) */
-static int parse_query(const char *uri_text, int i) {
+static int parse_fragment_or_query(const char *uri_text, size_t *i) {
   char c;
-  while ((c = uri_text[i]) != 0) {
-    const int advance = parse_pchar(uri_text, i); /* pchar */
+  while ((c = uri_text[*i]) != 0) {
+    const size_t advance = parse_pchar(uri_text, *i); /* pchar */
     switch (advance) {
       case 0: /* uri_text[i] isn't in pchar */
         /* maybe it's ? or / */
-        if (uri_text[i] == '?' || uri_text[i] == '/') {
-          i++;
+        if (uri_text[*i] == '?' || uri_text[*i] == '/') {
+          (*i)++;
           break;
         } else {
-          return i;
+          return 1;
         }
-      case 1:
-      case 2:
-        i += advance;
+        gpr_log(GPR_ERROR, "should never reach here");
+        abort();
+      default:
+        (*i) += advance;
         break;
-      default: /* uri_text[i] introduces an invalid URI */
-        return -i;
+      case NOT_SET: /* uri_text[i] introduces an invalid URI */
+        return 0;
     }
   }
-  return i; /* first uri_text position past the \a query production, maybe \0 */
+  /* *i is the first uri_text position past the \a query production, maybe \0 */
+  return 1;
 }
 
-/* alias for consistency */
-static int (*parse_fragment)(const char *uri_text, int i) = parse_query;
-
 grpc_uri *grpc_uri_parse(const char *uri_text, int suppress_errors) {
   grpc_uri *uri;
-  int scheme_begin = 0;
-  int scheme_end = -1;
-  int authority_begin = -1;
-  int authority_end = -1;
-  int path_begin = -1;
-  int path_end = -1;
-  int query_begin = -1;
-  int query_end = -1;
-  int fragment_begin = -1;
-  int fragment_end = -1;
-  int i;
+  size_t scheme_begin = 0;
+  size_t scheme_end = NOT_SET;
+  size_t authority_begin = NOT_SET;
+  size_t authority_end = NOT_SET;
+  size_t path_begin = NOT_SET;
+  size_t path_end = NOT_SET;
+  size_t query_begin = NOT_SET;
+  size_t query_end = NOT_SET;
+  size_t fragment_begin = NOT_SET;
+  size_t fragment_end = NOT_SET;
+  size_t i;
 
   for (i = scheme_begin; uri_text[i] != 0; i++) {
     if (uri_text[i] == ':') {
@@ -163,21 +163,22 @@ grpc_uri *grpc_uri_parse(const char *uri_text, int suppress_errors) {
     }
     break;
   }
-  if (scheme_end == -1) {
+  if (scheme_end == NOT_SET) {
     return bad_uri(uri_text, i, "scheme", suppress_errors);
   }
 
   if (uri_text[scheme_end + 1] == '/' && uri_text[scheme_end + 2] == '/') {
     authority_begin = scheme_end + 3;
-    for (i = authority_begin; uri_text[i] != 0 && authority_end == -1; i++) {
+    for (i = authority_begin; uri_text[i] != 0 && authority_end == NOT_SET;
+         i++) {
       if (uri_text[i] == '/' || uri_text[i] == '?' || uri_text[i] == '#') {
         authority_end = i;
       }
     }
-    if (authority_end == -1 && uri_text[i] == 0) {
+    if (authority_end == NOT_SET && uri_text[i] == 0) {
       authority_end = i;
     }
-    if (authority_end == -1) {
+    if (authority_end == NOT_SET) {
       return bad_uri(uri_text, i, "authority", suppress_errors);
     }
     /* TODO(ctiller): parse the authority correctly */
@@ -192,18 +193,17 @@ grpc_uri *grpc_uri_parse(const char *uri_text, int suppress_errors) {
       break;
     }
   }
-  if (path_end == -1 && uri_text[i] == 0) {
+  if (path_end == NOT_SET && uri_text[i] == 0) {
     path_end = i;
   }
-  if (path_end == -1) {
+  if (path_end == NOT_SET) {
     return bad_uri(uri_text, i, "path", suppress_errors);
   }
 
   if (uri_text[i] == '?') {
-    query_begin = i + 1;
-    i = parse_query(uri_text, query_begin);
-    if (i < 0) {
-      return bad_uri(uri_text, -i, "query", suppress_errors);
+    query_begin = ++i;
+    if (!parse_fragment_or_query(uri_text, &i)) {
+      return bad_uri(uri_text, i, "query", suppress_errors);
     } else if (uri_text[i] != 0 && uri_text[i] != '#') {
       /* We must be at the end or at the beginning of a fragment */
       return bad_uri(uri_text, i, "query", suppress_errors);
@@ -211,9 +211,8 @@ grpc_uri *grpc_uri_parse(const char *uri_text, int suppress_errors) {
     query_end = i;
   }
   if (uri_text[i] == '#') {
-    fragment_begin = i + 1;
-    i = parse_fragment(uri_text, fragment_begin);
-    if (i < 0) {
+    fragment_begin = ++i;
+    if (!parse_fragment_or_query(uri_text, &i)) {
       return bad_uri(uri_text, i - fragment_end, "fragment", suppress_errors);
     } else if (uri_text[i] != 0) {
       /* We must be at the end */
diff --git a/src/core/compression/algorithm.c b/src/core/compression/algorithm.c
index 6ed6dbe93f..76d42fde0f 100644
--- a/src/core/compression/algorithm.c
+++ b/src/core/compression/algorithm.c
@@ -33,7 +33,9 @@
 
 #include <stdlib.h>
 #include <string.h>
+
 #include <grpc/compression.h>
+#include <grpc/support/useful.h>
 
 int grpc_compression_algorithm_parse(const char *name, size_t name_length,
                                      grpc_compression_algorithm *algorithm) {
@@ -102,3 +104,24 @@ grpc_compression_level grpc_compression_level_for_algorithm(
   }
   abort();
 }
+
+void grpc_compression_options_init(grpc_compression_options *opts) {
+  opts->enabled_algorithms_bitset = (1u << GRPC_COMPRESS_ALGORITHMS_COUNT)-1;
+  opts->default_compression_algorithm = GRPC_COMPRESS_NONE;
+}
+
+void grpc_compression_options_enable_algorithm(
+    grpc_compression_options *opts, grpc_compression_algorithm algorithm) {
+  GPR_BITSET(&opts->enabled_algorithms_bitset, algorithm);
+}
+
+void grpc_compression_options_disable_algorithm(
+    grpc_compression_options *opts, grpc_compression_algorithm algorithm) {
+  GPR_BITCLEAR(&opts->enabled_algorithms_bitset, algorithm);
+}
+
+int grpc_compression_options_is_algorithm_enabled(
+    const grpc_compression_options *opts,
+    grpc_compression_algorithm algorithm) {
+  return GPR_BITGET(opts->enabled_algorithms_bitset, algorithm);
+}
diff --git a/src/core/compression/message_compress.c b/src/core/compression/message_compress.c
index 7856f40dd1..01db7134c3 100644
--- a/src/core/compression/message_compress.c
+++ b/src/core/compression/message_compress.c
@@ -49,19 +49,23 @@ static int zlib_body(z_stream *zs, gpr_slice_buffer *input,
   int flush;
   size_t i;
   gpr_slice outbuf = gpr_slice_malloc(OUTPUT_BLOCK_SIZE);
+  const uInt uint_max = ~(uInt)0;
 
-  zs->avail_out = GPR_SLICE_LENGTH(outbuf);
+  GPR_ASSERT(GPR_SLICE_LENGTH(outbuf) <= uint_max);
+  zs->avail_out = (uInt)GPR_SLICE_LENGTH(outbuf);
   zs->next_out = GPR_SLICE_START_PTR(outbuf);
   flush = Z_NO_FLUSH;
   for (i = 0; i < input->count; i++) {
     if (i == input->count - 1) flush = Z_FINISH;
-    zs->avail_in = GPR_SLICE_LENGTH(input->slices[i]);
+    GPR_ASSERT(GPR_SLICE_LENGTH(input->slices[i]) <= uint_max);
+    zs->avail_in = (uInt)GPR_SLICE_LENGTH(input->slices[i]);
     zs->next_in = GPR_SLICE_START_PTR(input->slices[i]);
     do {
       if (zs->avail_out == 0) {
         gpr_slice_buffer_add_indexed(output, outbuf);
         outbuf = gpr_slice_malloc(OUTPUT_BLOCK_SIZE);
-        zs->avail_out = GPR_SLICE_LENGTH(outbuf);
+        GPR_ASSERT(GPR_SLICE_LENGTH(outbuf) <= uint_max);
+        zs->avail_out = (uInt)GPR_SLICE_LENGTH(outbuf);
         zs->next_out = GPR_SLICE_START_PTR(outbuf);
       }
       r = flate(zs, flush);
diff --git a/src/core/debug/trace.c b/src/core/debug/trace.c
index 1014b1f4db..3b35d81cd8 100644
--- a/src/core/debug/trace.c
+++ b/src/core/debug/trace.c
@@ -59,9 +59,13 @@ void grpc_register_tracer(const char *name, int *flag) {
 static void add(const char *beg, const char *end, char ***ss, size_t *ns) {
   size_t n = *ns;
   size_t np = n + 1;
-  char *s = gpr_malloc(end - beg + 1);
-  memcpy(s, beg, end - beg);
-  s[end - beg] = 0;
+  char *s;
+  size_t len;
+  GPR_ASSERT(end >= beg);
+  len = (size_t)(end - beg);
+  s = gpr_malloc(len + 1);
+  memcpy(s, beg, len);
+  s[len] = 0;
   *ss = gpr_realloc(*ss, sizeof(char **) * np);
   (*ss)[n] = s;
   *ns = np;
diff --git a/src/core/httpcli/parser.c b/src/core/httpcli/parser.c
index 7b2a62060c..404906d5ae 100644
--- a/src/core/httpcli/parser.c
+++ b/src/core/httpcli/parser.c
@@ -96,13 +96,15 @@ static int add_header(grpc_httpcli_parser *parser) {
     gpr_log(GPR_ERROR, "Didn't find ':' in header string");
     goto error;
   }
-  hdr.key = buf2str(beg, cur - beg);
+  GPR_ASSERT(cur >= beg);
+  hdr.key = buf2str(beg, (size_t)(cur - beg));
   cur++; /* skip : */
 
   while (cur != end && (*cur == ' ' || *cur == '\t')) {
     cur++;
   }
-  hdr.value = buf2str(cur, end - cur - 2);
+  GPR_ASSERT(end - cur >= 2);
+  hdr.value = buf2str(cur, (size_t)(end - cur) - 2);
 
   if (parser->r.hdr_count == parser->hdr_capacity) {
     parser->hdr_capacity =
@@ -171,7 +173,7 @@ static int addbyte(grpc_httpcli_parser *parser, gpr_uint8 byte) {
         parser->r.body =
             gpr_realloc((void *)parser->r.body, parser->body_capacity);
       }
-      ((char *)parser->r.body)[parser->r.body_length] = byte;
+      parser->r.body[parser->r.body_length] = (char)byte;
       parser->r.body_length++;
       return 1;
   }
diff --git a/src/core/iomgr/alarm.c b/src/core/iomgr/alarm.c
index ddb30dc4bb..7b67fe3b1d 100644
--- a/src/core/iomgr/alarm.c
+++ b/src/core/iomgr/alarm.c
@@ -83,7 +83,7 @@ static gpr_timespec compute_min_deadline(shard_type *shard) {
 }
 
 void grpc_alarm_list_init(gpr_timespec now) {
-  int i;
+  gpr_uint32 i;
 
   gpr_mu_init(&g_mu);
   gpr_mu_init(&g_checker_mu);
@@ -123,13 +123,13 @@ static size_t shard_idx(const grpc_alarm *info) {
 }
 
 static double ts_to_dbl(gpr_timespec ts) {
-  return ts.tv_sec + 1e-9 * ts.tv_nsec;
+  return (double)ts.tv_sec + 1e-9 * ts.tv_nsec;
 }
 
 static gpr_timespec dbl_to_ts(double d) {
   gpr_timespec ts;
-  ts.tv_sec = d;
-  ts.tv_nsec = 1e9 * (d - ts.tv_sec);
+  ts.tv_sec = (time_t)d;
+  ts.tv_nsec = (int)(1e9 * (d - (double)ts.tv_sec));
   ts.clock_type = GPR_TIMESPAN;
   return ts;
 }
@@ -145,7 +145,7 @@ static void list_remove(grpc_alarm *alarm) {
   alarm->prev->next = alarm->next;
 }
 
-static void swap_adjacent_shards_in_queue(size_t first_shard_queue_index) {
+static void swap_adjacent_shards_in_queue(gpr_uint32 first_shard_queue_index) {
   shard_type *temp;
   temp = g_shard_queue[first_shard_queue_index];
   g_shard_queue[first_shard_queue_index] =
@@ -355,7 +355,7 @@ static int run_some_expired_alarms(gpr_mu *drop_mu, gpr_timespec now,
     gpr_mu_lock(drop_mu);
   }
 
-  return n;
+  return (int)n;
 }
 
 int grpc_alarm_check(gpr_mu *drop_mu, gpr_timespec now, gpr_timespec *next) {
diff --git a/src/core/iomgr/alarm_heap.c b/src/core/iomgr/alarm_heap.c
index daed251982..769142e425 100644
--- a/src/core/iomgr/alarm_heap.c
+++ b/src/core/iomgr/alarm_heap.c
@@ -43,9 +43,9 @@
    position. This functor is called each time immediately after modifying a
    value in the underlying container, with the offset of the modified element as
    its argument. */
-static void adjust_upwards(grpc_alarm **first, int i, grpc_alarm *t) {
+static void adjust_upwards(grpc_alarm **first, gpr_uint32 i, grpc_alarm *t) {
   while (i > 0) {
-    int parent = (i - 1) / 2;
+    gpr_uint32 parent = (gpr_uint32)(((int)i - 1) / 2);
     if (gpr_time_cmp(first[parent]->deadline, t->deadline) >= 0) break;
     first[i] = first[parent];
     first[i]->heap_index = i;
@@ -58,12 +58,12 @@ static void adjust_upwards(grpc_alarm **first, int i, grpc_alarm *t) {
 /* Adjusts a heap so as to move a hole at position i farther away from the root,
    until a suitable position is found for element t.  Then, copies t into that
    position. */
-static void adjust_downwards(grpc_alarm **first, int i, int length,
-                             grpc_alarm *t) {
+static void adjust_downwards(grpc_alarm **first, gpr_uint32 i,
+                             gpr_uint32 length, grpc_alarm *t) {
   for (;;) {
-    int left_child = 1 + 2 * i;
-    int right_child;
-    int next_i;
+    gpr_uint32 left_child = 1u + 2u * i;
+    gpr_uint32 right_child;
+    gpr_uint32 next_i;
     if (left_child >= length) break;
     right_child = left_child + 1;
     next_i = right_child < length &&
@@ -93,8 +93,8 @@ static void maybe_shrink(grpc_alarm_heap *heap) {
 }
 
 static void note_changed_priority(grpc_alarm_heap *heap, grpc_alarm *alarm) {
-  int i = alarm->heap_index;
-  int parent = (i - 1) / 2;
+  gpr_uint32 i = alarm->heap_index;
+  gpr_uint32 parent = (gpr_uint32)(((int)i - 1) / 2);
   if (gpr_time_cmp(heap->alarms[parent]->deadline, alarm->deadline) < 0) {
     adjust_upwards(heap->alarms, i, alarm);
   } else {
@@ -122,7 +122,7 @@ int grpc_alarm_heap_add(grpc_alarm_heap *heap, grpc_alarm *alarm) {
 }
 
 void grpc_alarm_heap_remove(grpc_alarm_heap *heap, grpc_alarm *alarm) {
-  int i = alarm->heap_index;
+  gpr_uint32 i = alarm->heap_index;
   if (i == heap->alarm_count - 1) {
     heap->alarm_count--;
     maybe_shrink(heap);
diff --git a/src/core/iomgr/alarm_heap.h b/src/core/iomgr/alarm_heap.h
index 60db6c991b..91d6ee3ca2 100644
--- a/src/core/iomgr/alarm_heap.h
+++ b/src/core/iomgr/alarm_heap.h
@@ -38,8 +38,8 @@
 
 typedef struct {
   grpc_alarm **alarms;
-  int alarm_count;
-  int alarm_capacity;
+  gpr_uint32 alarm_count;
+  gpr_uint32 alarm_capacity;
 } grpc_alarm_heap;
 
 /* return 1 if the new alarm is the first alarm in the heap */
diff --git a/src/core/iomgr/pollset_multipoller_with_epoll.c b/src/core/iomgr/pollset_multipoller_with_epoll.c
index fe66ebed77..8f62ce2954 100644
--- a/src/core/iomgr/pollset_multipoller_with_epoll.c
+++ b/src/core/iomgr/pollset_multipoller_with_epoll.c
@@ -99,7 +99,6 @@ static void perform_delayed_add(void *arg, int iomgr_status) {
   if (da->pollset->shutting_down) {
     /* We don't care about this pollset anymore. */
     if (da->pollset->in_flight_cbs == 0 && !da->pollset->called_shutdown) {
-      GPR_ASSERT(!grpc_pollset_has_workers(da->pollset));
       da->pollset->called_shutdown = 1;
       do_shutdown_cb = 1;
     }
diff --git a/src/core/iomgr/pollset_multipoller_with_poll_posix.c b/src/core/iomgr/pollset_multipoller_with_poll_posix.c
index 30ee6e24db..cae260cab0 100644
--- a/src/core/iomgr/pollset_multipoller_with_poll_posix.c
+++ b/src/core/iomgr/pollset_multipoller_with_poll_posix.c
@@ -101,7 +101,8 @@ static void multipoll_with_poll_pollset_maybe_work(
     gpr_timespec now, int allow_synchronous_callback) {
   int timeout;
   int r;
-  size_t i, j, pfd_count, fd_count;
+  size_t i, j, fd_count;
+  nfds_t pfd_count;
   pollset_hdr *h;
   /* TODO(ctiller): inline some elements to avoid an allocation */
   grpc_fd_watcher *watchers;
@@ -140,8 +141,8 @@ static void multipoll_with_poll_pollset_maybe_work(
   gpr_mu_unlock(&pollset->mu);
 
   for (i = 1; i < pfd_count; i++) {
-    pfds[i].events = grpc_fd_begin_poll(watchers[i].fd, pollset, POLLIN,
-                                        POLLOUT, &watchers[i]);
+    pfds[i].events = (short)grpc_fd_begin_poll(watchers[i].fd, pollset, POLLIN,
+                                               POLLOUT, &watchers[i]);
   }
 
   r = grpc_poll_function(pfds, pfd_count, timeout);
diff --git a/src/core/iomgr/pollset_posix.c b/src/core/iomgr/pollset_posix.c
index 6bd1b61f24..dec2f5490f 100644
--- a/src/core/iomgr/pollset_posix.c
+++ b/src/core/iomgr/pollset_posix.c
@@ -420,7 +420,7 @@ static void basic_pollset_maybe_work(grpc_pollset *pollset,
   grpc_fd_watcher fd_watcher;
   int timeout;
   int r;
-  int nfds;
+  nfds_t nfds;
 
   if (pollset->in_flight_cbs) {
     /* Give do_promote priority so we don't starve it out */
@@ -443,7 +443,7 @@ static void basic_pollset_maybe_work(grpc_pollset *pollset,
     pfd[1].revents = 0;
     gpr_mu_unlock(&pollset->mu);
     pfd[1].events =
-        grpc_fd_begin_poll(fd, pollset, POLLIN, POLLOUT, &fd_watcher);
+        (short)grpc_fd_begin_poll(fd, pollset, POLLIN, POLLOUT, &fd_watcher);
     if (pfd[1].events != 0) {
       nfds++;
     }
diff --git a/src/core/iomgr/resolve_address.h b/src/core/iomgr/resolve_address.h
index cc1bd428b0..9f361cb892 100644
--- a/src/core/iomgr/resolve_address.h
+++ b/src/core/iomgr/resolve_address.h
@@ -40,7 +40,7 @@
 
 typedef struct {
   char addr[GRPC_MAX_SOCKADDR_SIZE];
-  int len;
+  size_t len;
 } grpc_resolved_address;
 
 typedef struct {
diff --git a/src/core/iomgr/sockaddr_utils.c b/src/core/iomgr/sockaddr_utils.c
index efdc480365..0e4bf24549 100644
--- a/src/core/iomgr/sockaddr_utils.c
+++ b/src/core/iomgr/sockaddr_utils.c
@@ -123,15 +123,17 @@ void grpc_sockaddr_make_wildcards(int port, struct sockaddr_in *wild4_out,
 }
 
 void grpc_sockaddr_make_wildcard4(int port, struct sockaddr_in *wild_out) {
+  GPR_ASSERT(port >= 0 && port < 65536);
   memset(wild_out, 0, sizeof(*wild_out));
   wild_out->sin_family = AF_INET;
-  wild_out->sin_port = htons(port);
+  wild_out->sin_port = htons((gpr_uint16)port);
 }
 
 void grpc_sockaddr_make_wildcard6(int port, struct sockaddr_in6 *wild_out) {
+  GPR_ASSERT(port >= 0 && port < 65536);
   memset(wild_out, 0, sizeof(*wild_out));
   wild_out->sin6_family = AF_INET6;
-  wild_out->sin6_port = htons(port);
+  wild_out->sin6_port = htons((gpr_uint16)port);
 }
 
 int grpc_sockaddr_to_string(char **out, const struct sockaddr *addr,
@@ -215,10 +217,12 @@ int grpc_sockaddr_get_port(const struct sockaddr *addr) {
 int grpc_sockaddr_set_port(const struct sockaddr *addr, int port) {
   switch (addr->sa_family) {
     case AF_INET:
-      ((struct sockaddr_in *)addr)->sin_port = htons(port);
+      GPR_ASSERT(port >= 0 && port < 65536);
+      ((struct sockaddr_in *)addr)->sin_port = htons((gpr_uint16)port);
       return 1;
     case AF_INET6:
-      ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
+      GPR_ASSERT(port >= 0 && port < 65536);
+      ((struct sockaddr_in6 *)addr)->sin6_port = htons((gpr_uint16)port);
       return 1;
     default:
       gpr_log(GPR_ERROR, "Unknown socket family %d in grpc_sockaddr_set_port",
diff --git a/src/core/iomgr/socket_windows.c b/src/core/iomgr/socket_windows.c
index 2cbe945ca3..557ca82226 100644
--- a/src/core/iomgr/socket_windows.c
+++ b/src/core/iomgr/socket_windows.c
@@ -35,8 +35,12 @@
 
 #ifdef GPR_WINSOCK_SOCKET
 
+#include <winsock2.h>
+#include <mswsock.h>
+
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
+#include <grpc/support/log_win32.h>
 #include <grpc/support/string_util.h>
 
 #include "src/core/iomgr/iocp_windows.h"
@@ -63,6 +67,24 @@ grpc_winsocket *grpc_winsocket_create(SOCKET socket, const char *name) {
    various callsites of that function, which happens to be in various
    mutex hold states, and that'd be unsafe to call them directly. */
 void grpc_winsocket_shutdown(grpc_winsocket *winsocket) {
+  /* Grab the function pointer for DisconnectEx for that specific socket.
+     It may change depending on the interface. */
+  int status;
+  GUID guid = WSAID_DISCONNECTEX;
+  LPFN_DISCONNECTEX DisconnectEx;
+  DWORD ioctl_num_bytes;
+
+  status = WSAIoctl(winsocket->socket, SIO_GET_EXTENSION_FUNCTION_POINTER,
+                    &guid, sizeof(guid), &DisconnectEx, sizeof(DisconnectEx),
+                    &ioctl_num_bytes, NULL, NULL);
+
+  if (status == 0) {
+    DisconnectEx(winsocket->socket, NULL, 0, 0);
+  } else {
+    char *utf8_message = gpr_format_message(WSAGetLastError());
+    gpr_log(GPR_ERROR, "Unable to retrieve DisconnectEx pointer : %s", utf8_message);
+    gpr_free(utf8_message);
+  }
   closesocket(winsocket->socket);
 }
 
diff --git a/src/core/iomgr/tcp_client.h b/src/core/iomgr/tcp_client.h
index 8ad9b818e1..12296bd55b 100644
--- a/src/core/iomgr/tcp_client.h
+++ b/src/core/iomgr/tcp_client.h
@@ -46,7 +46,7 @@
    in this connection being established (in order to continue their work) */
 void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *tcp),
                              void *arg, grpc_pollset_set *interested_parties,
-                             const struct sockaddr *addr, int addr_len,
+                             const struct sockaddr *addr, size_t addr_len,
                              gpr_timespec deadline);
 
 #endif /* GRPC_INTERNAL_CORE_IOMGR_TCP_CLIENT_H */
diff --git a/src/core/iomgr/tcp_client_posix.c b/src/core/iomgr/tcp_client_posix.c
index 66027f87a0..c3668f6a92 100644
--- a/src/core/iomgr/tcp_client_posix.c
+++ b/src/core/iomgr/tcp_client_posix.c
@@ -195,7 +195,7 @@ finish:
 
 void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *ep),
                              void *arg, grpc_pollset_set *interested_parties,
-                             const struct sockaddr *addr, int addr_len,
+                             const struct sockaddr *addr, size_t addr_len,
                              gpr_timespec deadline) {
   int fd;
   grpc_dualstack_mode dsmode;
@@ -229,7 +229,8 @@ void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *ep),
   }
 
   do {
-    err = connect(fd, addr, addr_len);
+    GPR_ASSERT(addr_len < ~(socklen_t)0);
+    err = connect(fd, addr, (socklen_t)addr_len);
   } while (err < 0 && errno == EINTR);
 
   addr_str = grpc_sockaddr_to_uri(addr);
diff --git a/src/core/iomgr/tcp_posix.c b/src/core/iomgr/tcp_posix.c
index 0db7cd9f0e..68f469c368 100644
--- a/src/core/iomgr/tcp_posix.c
+++ b/src/core/iomgr/tcp_posix.c
@@ -61,14 +61,20 @@
 #define SENDMSG_FLAGS 0
 #endif
 
+#ifdef GPR_MSG_IOVLEN_TYPE
+typedef GPR_MSG_IOVLEN_TYPE msg_iovlen_type;
+#else
+typedef size_t msg_iovlen_type;
+#endif
+
 int grpc_tcp_trace = 0;
 
 typedef struct {
   grpc_endpoint base;
   grpc_fd *em_fd;
   int fd;
-  int iov_size; /* Number of slices to allocate per read attempt */
   int finished_edge;
+  msg_iovlen_type iov_size; /* Number of slices to allocate per read attempt */
   size_t slice_size;
   gpr_refcount refcount;
 
@@ -215,8 +221,9 @@ static void tcp_continue_read(grpc_tcp *tcp) {
   } else {
     GPR_ASSERT((size_t)read_bytes <= tcp->incoming_buffer->length);
     if ((size_t)read_bytes < tcp->incoming_buffer->length) {
-      gpr_slice_buffer_trim_end(tcp->incoming_buffer,
-                                tcp->incoming_buffer->length - read_bytes);
+      gpr_slice_buffer_trim_end(
+          tcp->incoming_buffer,
+          tcp->incoming_buffer->length - (size_t)read_bytes);
     } else if (tcp->iov_size < MAX_READ_IOVEC) {
       ++tcp->iov_size;
     }
@@ -264,12 +271,12 @@ static grpc_endpoint_op_status tcp_read(grpc_endpoint *ep,
 static grpc_endpoint_op_status tcp_flush(grpc_tcp *tcp) {
   struct msghdr msg;
   struct iovec iov[MAX_WRITE_IOVEC];
-  int iov_size;
+  msg_iovlen_type iov_size;
   ssize_t sent_length;
-  ssize_t sending_length;
-  ssize_t trailing;
-  ssize_t unwind_slice_idx;
-  ssize_t unwind_byte_idx;
+  size_t sending_length;
+  size_t trailing;
+  size_t unwind_slice_idx;
+  size_t unwind_byte_idx;
 
   for (;;) {
     sending_length = 0;
@@ -319,9 +326,9 @@ static grpc_endpoint_op_status tcp_flush(grpc_tcp *tcp) {
     }
 
     GPR_ASSERT(tcp->outgoing_byte_idx == 0);
-    trailing = sending_length - sent_length;
+    trailing = sending_length - (size_t)sent_length;
     while (trailing > 0) {
-      ssize_t slice_length;
+      size_t slice_length;
 
       tcp->outgoing_slice_idx--;
       slice_length = GPR_SLICE_LENGTH(
diff --git a/src/core/iomgr/tcp_server.h b/src/core/iomgr/tcp_server.h
index 66bb3ef701..5165f5c5ca 100644
--- a/src/core/iomgr/tcp_server.h
+++ b/src/core/iomgr/tcp_server.h
@@ -62,7 +62,7 @@ void grpc_tcp_server_start(grpc_tcp_server *server, grpc_pollset **pollsets,
 /* TODO(ctiller): deprecate this, and make grpc_tcp_server_add_ports to handle
                   all of the multiple socket port matching logic in one place */
 int grpc_tcp_server_add_port(grpc_tcp_server *s, const void *addr,
-                             int addr_len);
+                             size_t addr_len);
 
 /* Returns the file descriptor of the Nth listening socket on this server,
    or -1 if the index is out of bounds.
diff --git a/src/core/iomgr/tcp_server_posix.c b/src/core/iomgr/tcp_server_posix.c
index 6399aaadb9..bcbd0afe6b 100644
--- a/src/core/iomgr/tcp_server_posix.c
+++ b/src/core/iomgr/tcp_server_posix.c
@@ -83,7 +83,7 @@ typedef struct {
     struct sockaddr sockaddr;
     struct sockaddr_un un;
   } addr;
-  int addr_len;
+  size_t addr_len;
   grpc_iomgr_closure read_closure;
   grpc_iomgr_closure destroyed_closure;
 } server_port;
@@ -236,7 +236,7 @@ static void init_max_accept_queue_size(void) {
     char *end;
     long i = strtol(buf, &end, 10);
     if (i > 0 && i <= INT_MAX && end && *end == 0) {
-      n = i;
+      n = (int)i;
     }
   }
   fclose(fp);
@@ -256,7 +256,8 @@ static int get_max_accept_queue_size(void) {
 }
 
 /* Prepare a recently-created socket for listening. */
-static int prepare_socket(int fd, const struct sockaddr *addr, int addr_len) {
+static int prepare_socket(int fd, const struct sockaddr *addr,
+                          size_t addr_len) {
   struct sockaddr_storage sockname_temp;
   socklen_t sockname_len;
 
@@ -273,7 +274,8 @@ static int prepare_socket(int fd, const struct sockaddr *addr, int addr_len) {
     goto error;
   }
 
-  if (bind(fd, addr, addr_len) < 0) {
+  GPR_ASSERT(addr_len < ~(socklen_t)0);
+  if (bind(fd, addr, (socklen_t)addr_len) < 0) {
     char *addr_str;
     grpc_sockaddr_to_string(&addr_str, addr, 0);
     gpr_log(GPR_ERROR, "bind addr=%s: %s", addr_str, strerror(errno));
@@ -365,7 +367,7 @@ error:
 }
 
 static int add_socket_to_server(grpc_tcp_server *s, int fd,
-                                const struct sockaddr *addr, int addr_len) {
+                                const struct sockaddr *addr, size_t addr_len) {
   server_port *sp;
   int port;
   char *addr_str;
@@ -398,7 +400,7 @@ static int add_socket_to_server(grpc_tcp_server *s, int fd,
 }
 
 int grpc_tcp_server_add_port(grpc_tcp_server *s, const void *addr,
-                             int addr_len) {
+                             size_t addr_len) {
   int allocated_port1 = -1;
   int allocated_port2 = -1;
   unsigned i;
diff --git a/src/core/iomgr/udp_server.c b/src/core/iomgr/udp_server.c
index 6429c38b28..ed9eee8726 100644
--- a/src/core/iomgr/udp_server.c
+++ b/src/core/iomgr/udp_server.c
@@ -78,7 +78,7 @@ typedef struct {
     struct sockaddr sockaddr;
     struct sockaddr_un un;
   } addr;
-  int addr_len;
+  size_t addr_len;
   grpc_iomgr_closure read_closure;
   grpc_iomgr_closure destroyed_closure;
   grpc_udp_server_read_cb read_cb;
@@ -221,7 +221,8 @@ void grpc_udp_server_destroy(
 }
 
 /* Prepare a recently-created socket for listening. */
-static int prepare_socket(int fd, const struct sockaddr *addr, int addr_len) {
+static int prepare_socket(int fd, const struct sockaddr *addr,
+                          size_t addr_len) {
   struct sockaddr_storage sockname_temp;
   socklen_t sockname_len;
   int get_local_ip;
@@ -241,7 +242,8 @@ static int prepare_socket(int fd, const struct sockaddr *addr, int addr_len) {
 #endif
   }
 
-  if (bind(fd, addr, addr_len) < 0) {
+  GPR_ASSERT(addr_len < ~(socklen_t)0);
+  if (bind(fd, addr, (socklen_t)addr_len) < 0) {
     char *addr_str;
     grpc_sockaddr_to_string(&addr_str, addr, 0);
     gpr_log(GPR_ERROR, "bind addr=%s: %s", addr_str, strerror(errno));
@@ -287,7 +289,7 @@ static void on_read(void *arg, int success) {
 }
 
 static int add_socket_to_server(grpc_udp_server *s, int fd,
-                                const struct sockaddr *addr, int addr_len,
+                                const struct sockaddr *addr, size_t addr_len,
                                 grpc_udp_server_read_cb read_cb) {
   server_port *sp;
   int port;
@@ -319,8 +321,8 @@ static int add_socket_to_server(grpc_udp_server *s, int fd,
   return port;
 }
 
-int grpc_udp_server_add_port(grpc_udp_server *s, const void *addr, int addr_len,
-                             grpc_udp_server_read_cb read_cb) {
+int grpc_udp_server_add_port(grpc_udp_server *s, const void *addr,
+                             size_t addr_len, grpc_udp_server_read_cb read_cb) {
   int allocated_port1 = -1;
   int allocated_port2 = -1;
   unsigned i;
@@ -430,7 +432,7 @@ void grpc_udp_server_start(grpc_udp_server *s, grpc_pollset **pollsets,
 /* TODO(rjshade): Add a test for this method. */
 void grpc_udp_server_write(server_port *sp, const char *buffer, size_t buf_len,
                            const struct sockaddr *peer_address) {
-  int rc;
+  ssize_t rc;
   rc = sendto(sp->fd, buffer, buf_len, 0, peer_address, sizeof(peer_address));
   if (rc < 0) {
     gpr_log(GPR_ERROR, "Unable to send data: %s", strerror(errno));
diff --git a/src/core/iomgr/udp_server.h b/src/core/iomgr/udp_server.h
index fcc4ba6e97..389f84ecca 100644
--- a/src/core/iomgr/udp_server.h
+++ b/src/core/iomgr/udp_server.h
@@ -67,8 +67,8 @@ int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned index);
 
 /* TODO(ctiller): deprecate this, and make grpc_udp_server_add_ports to handle
                   all of the multiple socket port matching logic in one place */
-int grpc_udp_server_add_port(grpc_udp_server *s, const void *addr, int addr_len,
-                             grpc_udp_server_read_cb read_cb);
+int grpc_udp_server_add_port(grpc_udp_server *s, const void *addr,
+                             size_t addr_len, grpc_udp_server_read_cb read_cb);
 
 void grpc_udp_server_destroy(grpc_udp_server *server,
                              void (*shutdown_done)(void *shutdown_done_arg),
diff --git a/src/core/iomgr/wakeup_fd_pipe.c b/src/core/iomgr/wakeup_fd_pipe.c
index bd643e8061..902034ee4b 100644
--- a/src/core/iomgr/wakeup_fd_pipe.c
+++ b/src/core/iomgr/wakeup_fd_pipe.c
@@ -56,7 +56,7 @@ static void pipe_init(grpc_wakeup_fd *fd_info) {
 
 static void pipe_consume(grpc_wakeup_fd *fd_info) {
   char buf[128];
-  int r;
+  ssize_t r;
 
   for (;;) {
     r = read(fd_info->read_fd, buf, sizeof(buf));
diff --git a/src/core/security/base64.c b/src/core/security/base64.c
index 8dfaef846f..5226d2c578 100644
--- a/src/core/security/base64.c
+++ b/src/core/security/base64.c
@@ -125,13 +125,14 @@ gpr_slice grpc_base64_decode(const char *b64, int url_safe) {
 
 static void decode_one_char(const unsigned char *codes, unsigned char *result,
                             size_t *result_offset) {
-  gpr_uint32 packed = (codes[0] << 2) | (codes[1] >> 4);
+  gpr_uint32 packed = ((gpr_uint32)codes[0] << 2) | ((gpr_uint32)codes[1] >> 4);
   result[(*result_offset)++] = (unsigned char)packed;
 }
 
 static void decode_two_chars(const unsigned char *codes, unsigned char *result,
                              size_t *result_offset) {
-  gpr_uint32 packed = (codes[0] << 10) | (codes[1] << 4) | (codes[2] >> 2);
+  gpr_uint32 packed = ((gpr_uint32)codes[0] << 10) |
+                      ((gpr_uint32)codes[1] << 4) | ((gpr_uint32)codes[2] >> 2);
   result[(*result_offset)++] = (unsigned char)(packed >> 8);
   result[(*result_offset)++] = (unsigned char)(packed);
 }
@@ -171,8 +172,9 @@ static int decode_group(const unsigned char *codes, size_t num_codes,
     decode_two_chars(codes, result, result_offset);
   } else {
     /* No padding. */
-    gpr_uint32 packed =
-        (codes[0] << 18) | (codes[1] << 12) | (codes[2] << 6) | codes[3];
+    gpr_uint32 packed = ((gpr_uint32)codes[0] << 18) |
+                        ((gpr_uint32)codes[1] << 12) |
+                        ((gpr_uint32)codes[2] << 6) | codes[3];
     result[(*result_offset)++] = (unsigned char)(packed >> 16);
     result[(*result_offset)++] = (unsigned char)(packed >> 8);
     result[(*result_offset)++] = (unsigned char)(packed);
diff --git a/src/core/security/jwt_verifier.c b/src/core/security/jwt_verifier.c
index 38ad134a6a..790f2178db 100644
--- a/src/core/security/jwt_verifier.c
+++ b/src/core/security/jwt_verifier.c
@@ -33,6 +33,7 @@
 
 #include "src/core/security/jwt_verifier.h"
 
+#include <limits.h>
 #include <string.h>
 
 #include "src/core/httpcli/httpcli.h"
@@ -412,7 +413,9 @@ static EVP_PKEY *extract_pkey_from_x509(const char *x509_str) {
   X509 *x509 = NULL;
   EVP_PKEY *result = NULL;
   BIO *bio = BIO_new(BIO_s_mem());
-  BIO_write(bio, x509_str, strlen(x509_str));
+  size_t len = strlen(x509_str);
+  GPR_ASSERT(len < INT_MAX);
+  BIO_write(bio, x509_str, (int)len);
   x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
   if (x509 == NULL) {
     gpr_log(GPR_ERROR, "Unable to parse x509 cert.");
@@ -439,7 +442,8 @@ static BIGNUM *bignum_from_base64(const char *b64) {
     gpr_log(GPR_ERROR, "Invalid base64 for big num.");
     return NULL;
   }
-  result = BN_bin2bn(GPR_SLICE_START_PTR(bin), GPR_SLICE_LENGTH(bin), NULL);
+  result =
+      BN_bin2bn(GPR_SLICE_START_PTR(bin), (int)GPR_SLICE_LENGTH(bin), NULL);
   gpr_slice_unref(bin);
   return result;
 }
@@ -769,7 +773,7 @@ void grpc_jwt_verifier_verify(grpc_jwt_verifier *verifier,
   GPR_ASSERT(verifier != NULL && jwt != NULL && audience != NULL && cb != NULL);
   dot = strchr(cur, '.');
   if (dot == NULL) goto error;
-  json = parse_json_part_from_jwt(cur, dot - cur, &header_buffer);
+  json = parse_json_part_from_jwt(cur, (size_t)(dot - cur), &header_buffer);
   if (json == NULL) goto error;
   header = jose_header_from_json(json, header_buffer);
   if (header == NULL) goto error;
@@ -777,7 +781,7 @@ void grpc_jwt_verifier_verify(grpc_jwt_verifier *verifier,
   cur = dot + 1;
   dot = strchr(cur, '.');
   if (dot == NULL) goto error;
-  json = parse_json_part_from_jwt(cur, dot - cur, &claims_buffer);
+  json = parse_json_part_from_jwt(cur, (size_t)(dot - cur), &claims_buffer);
   if (json == NULL) goto error;
   claims = grpc_jwt_claims_from_json(json, claims_buffer);
   if (claims == NULL) goto error;
diff --git a/src/core/security/server_auth_filter.c b/src/core/security/server_auth_filter.c
index b767f85498..d134201e87 100644
--- a/src/core/security/server_auth_filter.c
+++ b/src/core/security/server_auth_filter.c
@@ -128,9 +128,11 @@ static void on_md_processing_done(
     calld->num_consumed_md = num_consumed_md;
     grpc_metadata_batch_filter(&calld->md_op->data.metadata, remove_consumed_md,
                                elem);
+    grpc_metadata_array_destroy(&calld->md);
     calld->on_done_recv->cb(calld->on_done_recv->cb_arg, 1);
   } else {
     gpr_slice message;
+    grpc_metadata_array_destroy(&calld->md);
     error_details = error_details != NULL
                     ? error_details
                     : "Authentication metadata processing failed.";
@@ -139,7 +141,6 @@ static void on_md_processing_done(
     grpc_transport_stream_op_add_close(&calld->transport_op, status, &message);
     grpc_call_next_op(elem, &calld->transport_op);
   }
-  grpc_metadata_array_destroy(&calld->md);
 }
 
 static void auth_on_recv(void *user_data, int success) {
diff --git a/src/core/support/cpu_posix.c b/src/core/support/cpu_posix.c
index 99484e37fb..55d92c0555 100644
--- a/src/core/support/cpu_posix.c
+++ b/src/core/support/cpu_posix.c
@@ -44,11 +44,11 @@
 
 static __thread char magic_thread_local;
 
-static int ncpus = 0;
+static long ncpus = 0;
 
 static void init_ncpus() {
   ncpus = sysconf(_SC_NPROCESSORS_ONLN);
-  if (ncpus < 1) {
+  if (ncpus < 1 || ncpus > GPR_UINT32_MAX) {
     gpr_log(GPR_ERROR, "Cannot determine number of CPUs: assuming 1");
     ncpus = 1;
   }
@@ -57,7 +57,7 @@ static void init_ncpus() {
 unsigned gpr_cpu_num_cores(void) {
   static gpr_once once = GPR_ONCE_INIT;
   gpr_once_init(&once, init_ncpus);
-  return ncpus;
+  return (unsigned)ncpus;
 }
 
 /* This is a cheap, but good enough, pointer hash for sharding things: */
@@ -71,7 +71,7 @@ unsigned gpr_cpu_current_cpu(void) {
      most code that's using this is using it to shard across work queues though,
      so here we use thread identity instead to achieve a similar though not
      identical effect */
-  return shard_ptr(&magic_thread_local);
+  return (unsigned)shard_ptr(&magic_thread_local);
 }
 
 #endif /* GPR_CPU_POSIX */
diff --git a/src/core/support/log_posix.c b/src/core/support/log_posix.c
index 940ee20f15..021c4666d4 100644
--- a/src/core/support/log_posix.c
+++ b/src/core/support/log_posix.c
@@ -62,7 +62,7 @@ void gpr_log(const char *file, int line, gpr_log_severity severity,
   } else if ((size_t)ret <= sizeof(buf) - 1) {
     message = buf;
   } else {
-    message = allocated = gpr_malloc(ret + 1);
+    message = allocated = gpr_malloc((size_t)ret + 1);
     va_start(args, format);
     vsnprintf(message, ret + 1, format, args);
     va_end(args);
diff --git a/src/core/support/slice_buffer.c b/src/core/support/slice_buffer.c
index 6482ef9c9f..8873d459d5 100644
--- a/src/core/support/slice_buffer.c
+++ b/src/core/support/slice_buffer.c
@@ -69,7 +69,7 @@ void gpr_slice_buffer_destroy(gpr_slice_buffer *sb) {
   }
 }
 
-gpr_uint8 *gpr_slice_buffer_tiny_add(gpr_slice_buffer *sb, unsigned n) {
+gpr_uint8 *gpr_slice_buffer_tiny_add(gpr_slice_buffer *sb, size_t n) {
   gpr_slice *back;
   gpr_uint8 *out;
 
diff --git a/src/core/support/stack_lockfree.c b/src/core/support/stack_lockfree.c
index 27ecf62280..180ba19c68 100644
--- a/src/core/support/stack_lockfree.c
+++ b/src/core/support/stack_lockfree.c
@@ -79,7 +79,7 @@ struct gpr_stack_lockfree {
 #endif
 };
 
-gpr_stack_lockfree *gpr_stack_lockfree_create(int entries) {
+gpr_stack_lockfree *gpr_stack_lockfree_create(size_t entries) {
   gpr_stack_lockfree *stack;
   stack = gpr_malloc(sizeof(*stack));
   /* Since we only allocate 16 bits to represent an entry number,
@@ -123,13 +123,13 @@ int gpr_stack_lockfree_push(gpr_stack_lockfree *stack, int entry) {
 #ifndef NDEBUG
   /* Check for double push */
   {
-    int pushed_index = entry / (8 * sizeof(gpr_atm));
-    int pushed_bit = entry % (8 * sizeof(gpr_atm));
+    int pushed_index = entry / (int)(8 * sizeof(gpr_atm));
+    int pushed_bit = entry % (int)(8 * sizeof(gpr_atm));
     gpr_atm old_val;
 
     old_val = gpr_atm_no_barrier_fetch_add(&stack->pushed[pushed_index],
                                            (gpr_atm)(1UL << pushed_bit));
-    GPR_ASSERT((old_val & (1UL << pushed_bit)) == 0);
+    GPR_ASSERT((old_val & (gpr_atm)(1UL << pushed_bit)) == 0);
   }
 #endif
 
@@ -167,7 +167,7 @@ int gpr_stack_lockfree_pop(gpr_stack_lockfree *stack) {
 
     old_val = gpr_atm_no_barrier_fetch_add(&stack->pushed[pushed_index],
                                            -(gpr_atm)(1UL << pushed_bit));
-    GPR_ASSERT((old_val & (1UL << pushed_bit)) != 0);
+    GPR_ASSERT((old_val & (gpr_atm)(1UL << pushed_bit)) != 0);
   }
 #endif
 
diff --git a/src/core/support/stack_lockfree.h b/src/core/support/stack_lockfree.h
index eec960fbb0..2bbbe3bd95 100644
--- a/src/core/support/stack_lockfree.h
+++ b/src/core/support/stack_lockfree.h
@@ -34,11 +34,13 @@
 #ifndef GRPC_INTERNAL_CORE_SUPPORT_STACK_LOCKFREE_H
 #define GRPC_INTERNAL_CORE_SUPPORT_STACK_LOCKFREE_H
 
+#include <stddef.h>
+
 typedef struct gpr_stack_lockfree gpr_stack_lockfree;
 
 /* This stack must specify the maximum number of entries to track.
    The current implementation only allows up to 65534 entries */
-gpr_stack_lockfree* gpr_stack_lockfree_create(int entries);
+gpr_stack_lockfree* gpr_stack_lockfree_create(size_t entries);
 void gpr_stack_lockfree_destroy(gpr_stack_lockfree* stack);
 
 /* Pass in a valid entry number for the next stack entry */
diff --git a/src/core/support/time_posix.c b/src/core/support/time_posix.c
index a274400243..dcecff0d05 100644
--- a/src/core/support/time_posix.c
+++ b/src/core/support/time_posix.c
@@ -108,8 +108,8 @@ gpr_timespec gpr_now(gpr_clock_type clock) {
       break;
     case GPR_CLOCK_MONOTONIC:
       now_dbl = (mach_absolute_time() - g_time_start) * g_time_scale;
-      now.tv_sec = now_dbl * 1e-9;
-      now.tv_nsec = now_dbl - now.tv_sec * 1e9;
+      now.tv_sec = (time_t)(now_dbl * 1e-9);
+      now.tv_nsec = (int)(now_dbl - ((double)now.tv_sec) * 1e9);
       break;
     case GPR_CLOCK_PRECISE:
       gpr_precise_clock_now(&now);
diff --git a/src/core/surface/call.c b/src/core/surface/call.c
index a8b4d65fbc..4168c2ef0c 100644
--- a/src/core/surface/call.c
+++ b/src/core/surface/call.c
@@ -61,18 +61,6 @@
       - status/close recv (depending on client/server) */
 #define MAX_CONCURRENT_COMPLETIONS 6
 
-typedef enum { REQ_INITIAL = 0, REQ_READY, REQ_DONE } req_state;
-
-typedef enum {
-  SEND_NOTHING,
-  SEND_INITIAL_METADATA,
-  SEND_BUFFERED_INITIAL_METADATA,
-  SEND_MESSAGE,
-  SEND_BUFFERED_MESSAGE,
-  SEND_TRAILING_METADATA_AND_FINISH,
-  SEND_FINISH
-} send_action;
-
 typedef struct {
   grpc_ioreq_completion_func on_complete;
   void *user_data;
@@ -433,7 +421,7 @@ static grpc_cq_completion *allocate_completion(grpc_call *call) {
     if (call->allocated_completions & (1u << i)) {
       continue;
     }
-    call->allocated_completions |= 1u << i;
+    call->allocated_completions |= (gpr_uint8)(1u << i);
     gpr_mu_unlock(&call->completion_mu);
     return &call->completions[i];
   }
@@ -444,7 +432,8 @@ static grpc_cq_completion *allocate_completion(grpc_call *call) {
 static void done_completion(void *call, grpc_cq_completion *completion) {
   grpc_call *c = call;
   gpr_mu_lock(&c->completion_mu);
-  c->allocated_completions &= ~(1u << (completion - c->completions));
+  c->allocated_completions &=
+      (gpr_uint8) ~(1u << (completion - c->completions));
   gpr_mu_unlock(&c->completion_mu);
   GRPC_CALL_INTERNAL_UNREF(c, "completion", 1);
 }
@@ -520,7 +509,7 @@ static void set_status_code(grpc_call *call, status_source source,
   if (call->status[source].is_set) return;
 
   call->status[source].is_set = 1;
-  call->status[source].code = status;
+  call->status[source].code = (grpc_status_code)status;
   call->error_status_set = status != GRPC_STATUS_OK;
 
   if (status != GRPC_STATUS_OK && !grpc_bbq_empty(&call->incoming_queue)) {
@@ -545,7 +534,7 @@ static void set_encodings_accepted_by_peer(
   gpr_slice_buffer accept_encoding_parts;
 
   gpr_slice_buffer_init(&accept_encoding_parts);
-  gpr_slice_split(accept_encoding_slice, ", ", &accept_encoding_parts);
+  gpr_slice_split(accept_encoding_slice, ",", &accept_encoding_parts);
 
   /* No need to zero call->encodings_accepted_by_peer: grpc_call_create already
    * zeroes the whole grpc_call */
@@ -616,7 +605,7 @@ static void unlock(grpc_call *call) {
   int completing_requests = 0;
   int start_op = 0;
   int i;
-  const gpr_uint32 MAX_RECV_PEEK_AHEAD = 65536;
+  const size_t MAX_RECV_PEEK_AHEAD = 65536;
   size_t buffered_bytes;
   int cancel_alarm = 0;
 
@@ -755,7 +744,7 @@ static void finish_live_ioreq_op(grpc_call *call, grpc_ioreq_op op,
   size_t i;
   /* ioreq is live: we need to do something */
   master = &call->masters[master_set];
-  master->complete_mask |= 1u << op;
+  master->complete_mask |= (gpr_uint16)(1u << op);
   if (!success) {
     master->success = 0;
   }
@@ -1119,10 +1108,12 @@ static int fill_send_ops(grpc_call *call, grpc_transport_stream_op *op) {
     /* fall through intended */
     case WRITE_STATE_STARTED:
       if (is_op_live(call, GRPC_IOREQ_SEND_MESSAGE)) {
+        size_t length;
         data = call->request_data[GRPC_IOREQ_SEND_MESSAGE];
         flags = call->request_flags[GRPC_IOREQ_SEND_MESSAGE];
-        grpc_sopb_add_begin_message(
-            &call->send_ops, grpc_byte_buffer_length(data.send_message), flags);
+        length = grpc_byte_buffer_length(data.send_message);
+        GPR_ASSERT(length <= GPR_UINT32_MAX);
+        grpc_sopb_add_begin_message(&call->send_ops, (gpr_uint32)length, flags);
         copy_byte_buffer_to_stream_ops(data.send_message, &call->send_ops);
         op->send_ops = &call->send_ops;
         call->last_send_contains |= 1 << GRPC_IOREQ_SEND_MESSAGE;
@@ -1224,7 +1215,7 @@ static grpc_call_error start_ioreq(grpc_call *call, const grpc_ioreq *reqs,
                                    grpc_ioreq_completion_func completion,
                                    void *user_data) {
   size_t i;
-  gpr_uint32 have_ops = 0;
+  gpr_uint16 have_ops = 0;
   grpc_ioreq_op op;
   reqinfo_master *master;
   grpc_ioreq_data data;
@@ -1255,13 +1246,13 @@ static grpc_call_error start_ioreq(grpc_call *call, const grpc_ioreq *reqs,
     }
     if (op == GRPC_IOREQ_SEND_STATUS) {
       set_status_code(call, STATUS_FROM_SERVER_STATUS,
-                      reqs[i].data.send_status.code);
+                      (gpr_uint32)reqs[i].data.send_status.code);
       if (reqs[i].data.send_status.details) {
         set_status_details(call, STATUS_FROM_SERVER_STATUS,
                            GRPC_MDSTR_REF(reqs[i].data.send_status.details));
       }
     }
-    have_ops |= 1u << op;
+    have_ops |= (gpr_uint16)(1u << op);
 
     call->request_data[op] = data;
     call->request_flags[op] = reqs[i].flags;
@@ -1345,7 +1336,7 @@ static grpc_call_error cancel_with_status(grpc_call *c, grpc_status_code status,
 
   GPR_ASSERT(status != GRPC_STATUS_OK);
 
-  set_status_code(c, STATUS_FROM_API_OVERRIDE, status);
+  set_status_code(c, STATUS_FROM_API_OVERRIDE, (gpr_uint32)status);
   set_status_details(c, STATUS_FROM_API_OVERRIDE, details);
 
   c->cancel_with_status = status;
diff --git a/src/core/surface/channel.c b/src/core/surface/channel.c
index 586402e21c..a89523b3ab 100644
--- a/src/core/surface/channel.c
+++ b/src/core/surface/channel.c
@@ -113,7 +113,7 @@ grpc_channel *grpc_channel_create_from_filters(
       grpc_mdstr_from_string(mdctx, "grpc-message", 0);
   for (i = 0; i < NUM_CACHED_STATUS_ELEMS; i++) {
     char buf[GPR_LTOA_MIN_BUFSIZE];
-    gpr_ltoa(i, buf);
+    gpr_ltoa((long)i, buf);
     channel->grpc_status_elem[i] = grpc_mdelem_from_metadata_strings(
         mdctx, GRPC_MDSTR_REF(channel->grpc_status_string),
         grpc_mdstr_from_string(mdctx, buf, 0));
@@ -134,7 +134,7 @@ grpc_channel *grpc_channel_create_from_filters(
           gpr_log(GPR_ERROR, "%s ignored: it must be >= 0",
                   GRPC_ARG_MAX_MESSAGE_LENGTH);
         } else {
-          channel->max_message_length = args->args[i].value.integer;
+          channel->max_message_length = (gpr_uint32)args->args[i].value.integer;
         }
       } else if (0 == strcmp(args->args[i].key, GRPC_ARG_DEFAULT_AUTHORITY)) {
         if (args->args[i].type != GRPC_ARG_STRING) {
@@ -193,7 +193,7 @@ static grpc_call *grpc_channel_create_call_internal(
     grpc_completion_queue *cq, grpc_mdelem *path_mdelem,
     grpc_mdelem *authority_mdelem, gpr_timespec deadline) {
   grpc_mdelem *send_metadata[2];
-  int num_metadata = 0;
+  size_t num_metadata = 0;
 
   GPR_ASSERT(channel->is_client);
 
diff --git a/src/core/surface/channel_create.c b/src/core/surface/channel_create.c
index 707251da89..9e2cf1cf66 100644
--- a/src/core/surface/channel_create.c
+++ b/src/core/surface/channel_create.c
@@ -164,7 +164,7 @@ grpc_channel *grpc_insecure_channel_create(const char *target,
   grpc_resolver *resolver;
   subchannel_factory *f;
   grpc_mdctx *mdctx = grpc_mdctx_create();
-  int n = 0;
+  size_t n = 0;
   GPR_ASSERT(!reserved);
   if (grpc_channel_args_is_census_enabled(args)) {
     filters[n++] = &grpc_client_census_filter;
diff --git a/src/core/surface/secure_channel_create.c b/src/core/surface/secure_channel_create.c
index 35b60bdbef..9b554eeb70 100644
--- a/src/core/surface/secure_channel_create.c
+++ b/src/core/surface/secure_channel_create.c
@@ -197,7 +197,7 @@ grpc_channel *grpc_secure_channel_create(grpc_credentials *creds,
   subchannel_factory *f;
 #define MAX_FILTERS 3
   const grpc_channel_filter *filters[MAX_FILTERS];
-  int n = 0;
+  size_t n = 0;
 
   GPR_ASSERT(reserved == NULL);
   if (grpc_find_security_connector_in_args(args) != NULL) {
diff --git a/src/core/surface/server.c b/src/core/surface/server.c
index 292bf6fab8..3d404f78a4 100644
--- a/src/core/surface/server.c
+++ b/src/core/surface/server.c
@@ -33,6 +33,7 @@
 
 #include "src/core/surface/server.h"
 
+#include <limits.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -203,7 +204,7 @@ struct grpc_server {
   gpr_stack_lockfree *request_freelist;
   /** requested call backing data */
   requested_call *requested_calls;
-  int max_requested_calls;
+  size_t max_requested_calls;
 
   gpr_atm shutdown_flag;
   gpr_uint8 shutdown_published;
@@ -298,7 +299,7 @@ static void channel_broadcaster_shutdown(channel_broadcaster *cb,
  */
 
 static void request_matcher_init(request_matcher *request_matcher,
-                                 int entries) {
+                                 size_t entries) {
   memset(request_matcher, 0, sizeof(*request_matcher));
   request_matcher->requests = gpr_stack_lockfree_create(entries);
 }
@@ -804,7 +805,7 @@ grpc_server *grpc_server_create_from_filters(
   server->request_freelist =
       gpr_stack_lockfree_create(server->max_requested_calls);
   for (i = 0; i < (size_t)server->max_requested_calls; i++) {
-    gpr_stack_lockfree_push(server->request_freelist, i);
+    gpr_stack_lockfree_push(server->request_freelist, (int)i);
   }
   request_matcher_init(&server->unregistered_request_matcher,
                        server->max_requested_calls);
@@ -817,7 +818,7 @@ grpc_server *grpc_server_create_from_filters(
      grpc_server_census_filter (optional) - for stats collection and tracing
      {passed in filter stack}
      grpc_connected_channel_filter - for interfacing with transports */
-  server->channel_filter_count = filter_count + 1 + census_enabled;
+  server->channel_filter_count = filter_count + 1u + (census_enabled ? 1u : 0u);
   server->channel_filters =
       gpr_malloc(server->channel_filter_count * sizeof(grpc_channel_filter *));
   server->channel_filters[0] = &server_surface_filter;
@@ -825,7 +826,7 @@ grpc_server *grpc_server_create_from_filters(
     server->channel_filters[1] = &grpc_server_census_filter;
   }
   for (i = 0; i < filter_count; i++) {
-    server->channel_filters[i + 1 + census_enabled] = filters[i];
+    server->channel_filters[i + 1u + (census_enabled ? 1u : 0u)] = filters[i];
   }
 
   server->channel_args = grpc_channel_args_copy(args);
@@ -896,7 +897,7 @@ void grpc_server_setup_transport(grpc_server *s, grpc_transport *transport,
   grpc_mdstr *host;
   grpc_mdstr *method;
   gpr_uint32 hash;
-  gpr_uint32 slots;
+  size_t slots;
   gpr_uint32 probes;
   gpr_uint32 max_probes = 0;
   grpc_transport_op op;
@@ -949,7 +950,8 @@ void grpc_server_setup_transport(grpc_server *s, grpc_transport *transport,
       crm->host = host;
       crm->method = method;
     }
-    chand->registered_method_slots = slots;
+    GPR_ASSERT(slots <= GPR_UINT32_MAX);
+    chand->registered_method_slots = (gpr_uint32)slots;
     chand->registered_method_max_probes = max_probes;
   }
 
@@ -970,7 +972,7 @@ void grpc_server_setup_transport(grpc_server *s, grpc_transport *transport,
   op.set_accept_stream_user_data = chand;
   op.on_connectivity_state_change = &chand->channel_connectivity_changed;
   op.connectivity_state = &chand->connectivity_state;
-  op.disconnect = gpr_atm_acq_load(&s->shutdown_flag);
+  op.disconnect = gpr_atm_acq_load(&s->shutdown_flag) != 0;
   grpc_transport_perform_op(transport, &op);
 }
 
@@ -1246,7 +1248,8 @@ static void begin_call(grpc_server *server, call_data *calld,
   }
 
   GRPC_CALL_INTERNAL_REF(calld->call, "server");
-  grpc_call_start_ioreq_and_call_back(calld->call, req, r - req, publish, rc);
+  grpc_call_start_ioreq_and_call_back(calld->call, req, (size_t)(r - req),
+                                      publish, rc);
 }
 
 static void done_request_event(void *req, grpc_cq_completion *c) {
@@ -1255,8 +1258,9 @@ static void done_request_event(void *req, grpc_cq_completion *c) {
 
   if (rc >= server->requested_calls &&
       rc < server->requested_calls + server->max_requested_calls) {
+    GPR_ASSERT(rc - server->requested_calls <= INT_MAX);
     gpr_stack_lockfree_push(server->request_freelist,
-                            rc - server->requested_calls);
+                            (int)(rc - server->requested_calls));
   } else {
     gpr_free(req);
   }
diff --git a/src/core/transport/chttp2/bin_encoder.c b/src/core/transport/chttp2/bin_encoder.c
index dee6dbec8b..e21d800083 100644
--- a/src/core/transport/chttp2/bin_encoder.c
+++ b/src/core/transport/chttp2/bin_encoder.c
@@ -68,7 +68,7 @@ gpr_slice grpc_chttp2_base64_encode(gpr_slice input) {
   size_t output_length = input_triplets * 4 + tail_xtra[tail_case];
   gpr_slice output = gpr_slice_malloc(output_length);
   gpr_uint8 *in = GPR_SLICE_START_PTR(input);
-  gpr_uint8 *out = GPR_SLICE_START_PTR(output);
+  char *out = (char *)GPR_SLICE_START_PTR(output);
   size_t i;
 
   /* encode full triplets */
@@ -100,7 +100,7 @@ gpr_slice grpc_chttp2_base64_encode(gpr_slice input) {
       break;
   }
 
-  GPR_ASSERT(out == GPR_SLICE_END_PTR(output));
+  GPR_ASSERT(out == (char *)GPR_SLICE_END_PTR(output));
   GPR_ASSERT(in == GPR_SLICE_END_PTR(input));
   return output;
 }
@@ -128,12 +128,13 @@ gpr_slice grpc_chttp2_huffman_compress(gpr_slice input) {
 
     while (temp_length > 8) {
       temp_length -= 8;
-      *out++ = temp >> temp_length;
+      *out++ = (gpr_uint8)(temp >> temp_length);
     }
   }
 
   if (temp_length) {
-    *out++ = (temp << (8 - temp_length)) | (0xff >> temp_length);
+    *out++ = (gpr_uint8)(temp << (8u - temp_length)) |
+             (gpr_uint8)(0xffu >> temp_length);
   }
 
   GPR_ASSERT(out == GPR_SLICE_END_PTR(output));
@@ -150,16 +151,16 @@ typedef struct {
 static void enc_flush_some(huff_out *out) {
   while (out->temp_length > 8) {
     out->temp_length -= 8;
-    *out->out++ = out->temp >> out->temp_length;
+    *out->out++ = (gpr_uint8)(out->temp >> out->temp_length);
   }
 }
 
 static void enc_add2(huff_out *out, gpr_uint8 a, gpr_uint8 b) {
   b64_huff_sym sa = huff_alphabet[a];
   b64_huff_sym sb = huff_alphabet[b];
-  out->temp =
-      (out->temp << (sa.length + sb.length)) | (sa.bits << sb.length) | sb.bits;
-  out->temp_length += sa.length + sb.length;
+  out->temp = (out->temp << (sa.length + sb.length)) |
+              ((gpr_uint32)sa.bits << sb.length) | sb.bits;
+  out->temp_length += (gpr_uint32)sa.length + (gpr_uint32)sb.length;
   enc_flush_some(out);
 }
 
@@ -189,8 +190,9 @@ gpr_slice grpc_chttp2_base64_encode_and_huffman_compress(gpr_slice input) {
 
   /* encode full triplets */
   for (i = 0; i < input_triplets; i++) {
-    enc_add2(&out, in[0] >> 2, ((in[0] & 0x3) << 4) | (in[1] >> 4));
-    enc_add2(&out, ((in[1] & 0xf) << 2) | (in[2] >> 6), in[2] & 0x3f);
+    enc_add2(&out, in[0] >> 2, (gpr_uint8)((in[0] & 0x3) << 4) | (in[1] >> 4));
+    enc_add2(&out, (gpr_uint8)((in[1] & 0xf) << 2) | (in[2] >> 6),
+             (gpr_uint8)(in[2] & 0x3f));
     in += 3;
   }
 
@@ -199,19 +201,20 @@ gpr_slice grpc_chttp2_base64_encode_and_huffman_compress(gpr_slice input) {
     case 0:
       break;
     case 1:
-      enc_add2(&out, in[0] >> 2, (in[0] & 0x3) << 4);
+      enc_add2(&out, in[0] >> 2, (gpr_uint8)((in[0] & 0x3) << 4));
       in += 1;
       break;
     case 2:
-      enc_add2(&out, in[0] >> 2, ((in[0] & 0x3) << 4) | (in[1] >> 4));
-      enc_add1(&out, (in[1] & 0xf) << 2);
+      enc_add2(&out, in[0] >> 2,
+               (gpr_uint8)((in[0] & 0x3) << 4) | (gpr_uint8)(in[1] >> 4));
+      enc_add1(&out, (gpr_uint8)((in[1] & 0xf) << 2));
       in += 2;
       break;
   }
 
   if (out.temp_length) {
-    *out.out++ =
-        (out.temp << (8 - out.temp_length)) | (0xff >> out.temp_length);
+    *out.out++ = (gpr_uint8)(out.temp << (8u - out.temp_length)) |
+                 (gpr_uint8)(0xffu >> out.temp_length);
   }
 
   GPR_ASSERT(out.out <= GPR_SLICE_END_PTR(output));
diff --git a/src/core/transport/chttp2/frame_data.c b/src/core/transport/chttp2/frame_data.c
index 474c3d5ee6..403358016d 100644
--- a/src/core/transport/chttp2/frame_data.c
+++ b/src/core/transport/chttp2/frame_data.c
@@ -146,20 +146,23 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
       grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
                                                stream_parsing);
       if ((gpr_uint32)(end - cur) == p->frame_size) {
-        grpc_sopb_add_slice(&p->incoming_sopb,
-                            gpr_slice_sub(slice, cur - beg, end - beg));
+        grpc_sopb_add_slice(
+            &p->incoming_sopb,
+            gpr_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
         p->state = GRPC_CHTTP2_DATA_FH_0;
         return GRPC_CHTTP2_PARSE_OK;
       } else if ((gpr_uint32)(end - cur) > p->frame_size) {
-        grpc_sopb_add_slice(
-            &p->incoming_sopb,
-            gpr_slice_sub(slice, cur - beg, cur + p->frame_size - beg));
+        grpc_sopb_add_slice(&p->incoming_sopb,
+                            gpr_slice_sub(slice, (size_t)(cur - beg),
+                                          (size_t)(cur + p->frame_size - beg)));
         cur += p->frame_size;
         goto fh_0; /* loop */
       } else {
-        grpc_sopb_add_slice(&p->incoming_sopb,
-                            gpr_slice_sub(slice, cur - beg, end - beg));
-        p->frame_size -= (end - cur);
+        grpc_sopb_add_slice(
+            &p->incoming_sopb,
+            gpr_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
+        GPR_ASSERT(end - cur <= p->frame_size);
+        p->frame_size -= (gpr_uint32)(end - cur);
         return GRPC_CHTTP2_PARSE_OK;
       }
   }
diff --git a/src/core/transport/chttp2/frame_goaway.c b/src/core/transport/chttp2/frame_goaway.c
index 1ccbba840c..09d4da234c 100644
--- a/src/core/transport/chttp2/frame_goaway.c
+++ b/src/core/transport/chttp2/frame_goaway.c
@@ -136,14 +136,15 @@ grpc_chttp2_parse_error grpc_chttp2_goaway_parser_parse(
       ++cur;
     /* fallthrough */
     case GRPC_CHTTP2_GOAWAY_DEBUG:
-      memcpy(p->debug_data + p->debug_pos, cur, end - cur);
-      p->debug_pos += end - cur;
+      memcpy(p->debug_data + p->debug_pos, cur, (size_t)(end - cur));
+      GPR_ASSERT(end - cur < GPR_UINT32_MAX - p->debug_pos);
+      p->debug_pos += (gpr_uint32)(end - cur);
       p->state = GRPC_CHTTP2_GOAWAY_DEBUG;
       if (is_last) {
         transport_parsing->goaway_received = 1;
         transport_parsing->goaway_last_stream_index = p->last_stream_id;
         gpr_slice_unref(transport_parsing->goaway_text);
-        transport_parsing->goaway_error = p->error_code;
+        transport_parsing->goaway_error = (grpc_status_code)p->error_code;
         transport_parsing->goaway_text =
             gpr_slice_new(p->debug_data, p->debug_length, gpr_free);
         p->debug_data = NULL;
@@ -160,12 +161,14 @@ void grpc_chttp2_goaway_append(gpr_uint32 last_stream_id, gpr_uint32 error_code,
                                gpr_slice_buffer *slice_buffer) {
   gpr_slice header = gpr_slice_malloc(9 + 4 + 4);
   gpr_uint8 *p = GPR_SLICE_START_PTR(header);
-  gpr_uint32 frame_length = 4 + 4 + GPR_SLICE_LENGTH(debug_data);
+  gpr_uint32 frame_length;
+  GPR_ASSERT(GPR_SLICE_LENGTH(debug_data) < GPR_UINT32_MAX - 4 - 4);
+  frame_length = 4 + 4 + (gpr_uint32)GPR_SLICE_LENGTH(debug_data);
 
   /* frame header: length */
-  *p++ = frame_length >> 16;
-  *p++ = frame_length >> 8;
-  *p++ = frame_length;
+  *p++ = (gpr_uint8)(frame_length >> 16);
+  *p++ = (gpr_uint8)(frame_length >> 8);
+  *p++ = (gpr_uint8)(frame_length);
   /* frame header: type */
   *p++ = GRPC_CHTTP2_FRAME_GOAWAY;
   /* frame header: flags */
@@ -176,15 +179,15 @@ void grpc_chttp2_goaway_append(gpr_uint32 last_stream_id, gpr_uint32 error_code,
   *p++ = 0;
   *p++ = 0;
   /* payload: last stream id */
-  *p++ = last_stream_id >> 24;
-  *p++ = last_stream_id >> 16;
-  *p++ = last_stream_id >> 8;
-  *p++ = last_stream_id;
+  *p++ = (gpr_uint8)(last_stream_id >> 24);
+  *p++ = (gpr_uint8)(last_stream_id >> 16);
+  *p++ = (gpr_uint8)(last_stream_id >> 8);
+  *p++ = (gpr_uint8)(last_stream_id);
   /* payload: error code */
-  *p++ = error_code >> 24;
-  *p++ = error_code >> 16;
-  *p++ = error_code >> 8;
-  *p++ = error_code;
+  *p++ = (gpr_uint8)(error_code >> 24);
+  *p++ = (gpr_uint8)(error_code >> 16);
+  *p++ = (gpr_uint8)(error_code >> 8);
+  *p++ = (gpr_uint8)(error_code);
   GPR_ASSERT(p == GPR_SLICE_END_PTR(header));
   gpr_slice_buffer_add(slice_buffer, header);
   gpr_slice_buffer_add(slice_buffer, debug_data);
diff --git a/src/core/transport/chttp2/frame_rst_stream.c b/src/core/transport/chttp2/frame_rst_stream.c
index a878d936c1..67da245239 100644
--- a/src/core/transport/chttp2/frame_rst_stream.c
+++ b/src/core/transport/chttp2/frame_rst_stream.c
@@ -47,14 +47,14 @@ gpr_slice grpc_chttp2_rst_stream_create(gpr_uint32 id, gpr_uint32 code) {
   *p++ = 4;
   *p++ = GRPC_CHTTP2_FRAME_RST_STREAM;
   *p++ = 0;
-  *p++ = id >> 24;
-  *p++ = id >> 16;
-  *p++ = id >> 8;
-  *p++ = id;
-  *p++ = code >> 24;
-  *p++ = code >> 16;
-  *p++ = code >> 8;
-  *p++ = code;
+  *p++ = (gpr_uint8)(id >> 24);
+  *p++ = (gpr_uint8)(id >> 16);
+  *p++ = (gpr_uint8)(id >> 8);
+  *p++ = (gpr_uint8)(id);
+  *p++ = (gpr_uint8)(code >> 24);
+  *p++ = (gpr_uint8)(code >> 16);
+  *p++ = (gpr_uint8)(code >> 8);
+  *p++ = (gpr_uint8)(code);
 
   return slice;
 }
diff --git a/src/core/transport/chttp2/frame_settings.c b/src/core/transport/chttp2/frame_settings.c
index d42bc000ae..54d3694a5c 100644
--- a/src/core/transport/chttp2/frame_settings.c
+++ b/src/core/transport/chttp2/frame_settings.c
@@ -61,9 +61,9 @@ const grpc_chttp2_setting_parameters
 
 static gpr_uint8 *fill_header(gpr_uint8 *out, gpr_uint32 length,
                               gpr_uint8 flags) {
-  *out++ = length >> 16;
-  *out++ = length >> 8;
-  *out++ = length;
+  *out++ = (gpr_uint8)(length >> 16);
+  *out++ = (gpr_uint8)(length >> 8);
+  *out++ = (gpr_uint8)(length);
   *out++ = GRPC_CHTTP2_FRAME_SETTINGS;
   *out++ = flags;
   *out++ = 0;
@@ -76,26 +76,26 @@ static gpr_uint8 *fill_header(gpr_uint8 *out, gpr_uint32 length,
 gpr_slice grpc_chttp2_settings_create(gpr_uint32 *old, const gpr_uint32 *new,
                                       gpr_uint32 force_mask, size_t count) {
   size_t i;
-  size_t n = 0;
+  gpr_uint32 n = 0;
   gpr_slice output;
   gpr_uint8 *p;
 
   for (i = 0; i < count; i++) {
-    n += (new[i] != old[i] || (force_mask & (1 << i)) != 0);
+    n += (new[i] != old[i] || (force_mask & (1u << i)) != 0);
   }
 
   output = gpr_slice_malloc(9 + 6 * n);
   p = fill_header(GPR_SLICE_START_PTR(output), 6 * n, 0);
 
   for (i = 0; i < count; i++) {
-    if (new[i] != old[i] || (force_mask & (1 << i)) != 0) {
+    if (new[i] != old[i] || (force_mask & (1u << i)) != 0) {
       GPR_ASSERT(i);
-      *p++ = i >> 8;
-      *p++ = i;
-      *p++ = new[i] >> 24;
-      *p++ = new[i] >> 16;
-      *p++ = new[i] >> 8;
-      *p++ = new[i];
+      *p++ = (gpr_uint8)(i >> 8);
+      *p++ = (gpr_uint8)(i);
+      *p++ = (gpr_uint8)(new[i] >> 24);
+      *p++ = (gpr_uint8)(new[i] >> 16);
+      *p++ = (gpr_uint8)(new[i] >> 8);
+      *p++ = (gpr_uint8)(new[i]);
       old[i] = new[i];
     }
   }
@@ -162,7 +162,7 @@ grpc_chttp2_parse_error grpc_chttp2_settings_parser_parse(
           }
           return GRPC_CHTTP2_PARSE_OK;
         }
-        parser->id = ((gpr_uint16)*cur) << 8;
+        parser->id = (gpr_uint16)(((gpr_uint16)*cur) << 8);
         cur++;
       /* fallthrough */
       case GRPC_CHTTP2_SPS_ID1:
@@ -170,7 +170,7 @@ grpc_chttp2_parse_error grpc_chttp2_settings_parser_parse(
           parser->state = GRPC_CHTTP2_SPS_ID1;
           return GRPC_CHTTP2_PARSE_OK;
         }
-        parser->id |= (*cur);
+        parser->id = (gpr_uint16)(parser->id | (*cur));
         cur++;
       /* fallthrough */
       case GRPC_CHTTP2_SPS_VAL0:
diff --git a/src/core/transport/chttp2/frame_window_update.c b/src/core/transport/chttp2/frame_window_update.c
index d624298ad2..ea13969e8c 100644
--- a/src/core/transport/chttp2/frame_window_update.c
+++ b/src/core/transport/chttp2/frame_window_update.c
@@ -48,14 +48,14 @@ gpr_slice grpc_chttp2_window_update_create(gpr_uint32 id,
   *p++ = 4;
   *p++ = GRPC_CHTTP2_FRAME_WINDOW_UPDATE;
   *p++ = 0;
-  *p++ = id >> 24;
-  *p++ = id >> 16;
-  *p++ = id >> 8;
-  *p++ = id;
-  *p++ = window_update >> 24;
-  *p++ = window_update >> 16;
-  *p++ = window_update >> 8;
-  *p++ = window_update;
+  *p++ = (gpr_uint8)(id >> 24);
+  *p++ = (gpr_uint8)(id >> 16);
+  *p++ = (gpr_uint8)(id >> 8);
+  *p++ = (gpr_uint8)(id);
+  *p++ = (gpr_uint8)(window_update >> 24);
+  *p++ = (gpr_uint8)(window_update >> 16);
+  *p++ = (gpr_uint8)(window_update >> 8);
+  *p++ = (gpr_uint8)(window_update);
 
   return slice;
 }
diff --git a/src/core/transport/chttp2/hpack_parser.c b/src/core/transport/chttp2/hpack_parser.c
index f8bff42ed6..9c40e8a4e6 100644
--- a/src/core/transport/chttp2/hpack_parser.c
+++ b/src/core/transport/chttp2/hpack_parser.c
@@ -1085,11 +1085,13 @@ static int parse_string_prefix(grpc_chttp2_hpack_parser *p,
 static void append_bytes(grpc_chttp2_hpack_parser_string *str,
                          const gpr_uint8 *data, size_t length) {
   if (length + str->length > str->capacity) {
-    str->capacity = str->length + length;
+    GPR_ASSERT(str->length + length <= GPR_UINT32_MAX);
+    str->capacity = (gpr_uint32)(str->length + length);
     str->str = gpr_realloc(str->str, str->capacity);
   }
   memcpy(str->str + str->length, data, length);
-  str->length += length;
+  GPR_ASSERT(length <= GPR_UINT32_MAX - str->length);
+  str->length += (gpr_uint32)length;
 }
 
 static int append_string(grpc_chttp2_hpack_parser *p, const gpr_uint8 *cur,
@@ -1099,7 +1101,7 @@ static int append_string(grpc_chttp2_hpack_parser *p, const gpr_uint8 *cur,
   gpr_uint8 decoded[3];
   switch ((binary_state)p->binary) {
     case NOT_BINARY:
-      append_bytes(str, cur, end - cur);
+      append_bytes(str, cur, (size_t)(end - cur));
       return 1;
     b64_byte0:
     case B64_BYTE0:
@@ -1157,9 +1159,9 @@ static int append_string(grpc_chttp2_hpack_parser *p, const gpr_uint8 *cur,
         goto b64_byte3;
       p->base64_buffer |= bits;
       bits = p->base64_buffer;
-      decoded[0] = bits >> 16;
-      decoded[1] = bits >> 8;
-      decoded[2] = bits;
+      decoded[0] = (gpr_uint8)(bits >> 16);
+      decoded[1] = (gpr_uint8)(bits >> 8);
+      decoded[2] = (gpr_uint8)(bits);
       append_bytes(str, decoded, 3);
       goto b64_byte0;
   }
@@ -1189,7 +1191,7 @@ static int finish_str(grpc_chttp2_hpack_parser *p) {
                 bits & 0xffff);
         return 0;
       }
-      decoded[0] = bits >> 16;
+      decoded[0] = (gpr_uint8)(bits >> 16);
       append_bytes(str, decoded, 1);
       break;
     case B64_BYTE3:
@@ -1199,8 +1201,8 @@ static int finish_str(grpc_chttp2_hpack_parser *p) {
                 bits & 0xff);
         return 0;
       }
-      decoded[0] = bits >> 16;
-      decoded[1] = bits >> 8;
+      decoded[0] = (gpr_uint8)(bits >> 16);
+      decoded[1] = (gpr_uint8)(bits >> 8);
       append_bytes(str, decoded, 2);
       break;
   }
@@ -1249,13 +1251,14 @@ static int add_str_bytes(grpc_chttp2_hpack_parser *p, const gpr_uint8 *cur,
 static int parse_string(grpc_chttp2_hpack_parser *p, const gpr_uint8 *cur,
                         const gpr_uint8 *end) {
   size_t remaining = p->strlen - p->strgot;
-  size_t given = end - cur;
+  size_t given = (size_t)(end - cur);
   if (remaining <= given) {
     return add_str_bytes(p, cur, cur + remaining) && finish_str(p) &&
            parse_next(p, cur + remaining, end);
   } else {
     if (!add_str_bytes(p, cur, cur + given)) return 0;
-    p->strgot += given;
+    GPR_ASSERT(given <= GPR_UINT32_MAX - p->strgot);
+    p->strgot += (gpr_uint32)given;
     p->state = parse_string;
     return 1;
   }
diff --git a/src/core/transport/chttp2/hpack_parser.h b/src/core/transport/chttp2/hpack_parser.h
index c1768d9d5d..4f489d67fb 100644
--- a/src/core/transport/chttp2/hpack_parser.h
+++ b/src/core/transport/chttp2/hpack_parser.h
@@ -79,7 +79,7 @@ struct grpc_chttp2_hpack_parser {
   /* number of source bytes read for the currently parsing string */
   gpr_uint32 strgot;
   /* huffman decoding state */
-  gpr_uint16 huff_state;
+  gpr_int16 huff_state;
   /* is the string being decoded binary? */
   gpr_uint8 binary;
   /* is the current string huffman encoded? */
diff --git a/src/core/transport/chttp2/hpack_table.c b/src/core/transport/chttp2/hpack_table.c
index 4fc154380e..e18778ab0b 100644
--- a/src/core/transport/chttp2/hpack_table.c
+++ b/src/core/transport/chttp2/hpack_table.c
@@ -139,7 +139,7 @@ grpc_mdelem *grpc_chttp2_hptbl_lookup(const grpc_chttp2_hptbl *tbl,
   /* Otherwise, find the value in the list of valid entries */
   index -= (GRPC_CHTTP2_LAST_STATIC_ENTRY + 1);
   if (index < tbl->num_ents) {
-    gpr_uint32 offset = (tbl->num_ents - 1 - index + tbl->first_ent) %
+    gpr_uint32 offset = (tbl->num_ents - 1u - index + tbl->first_ent) %
                         GRPC_CHTTP2_MAX_TABLE_COUNT;
     return tbl->ents[offset];
   }
@@ -150,19 +150,22 @@ grpc_mdelem *grpc_chttp2_hptbl_lookup(const grpc_chttp2_hptbl *tbl,
 /* Evict one element from the table */
 static void evict1(grpc_chttp2_hptbl *tbl) {
   grpc_mdelem *first_ent = tbl->ents[tbl->first_ent];
-  tbl->mem_used -= GPR_SLICE_LENGTH(first_ent->key->slice) +
-                   GPR_SLICE_LENGTH(first_ent->value->slice) +
-                   GRPC_CHTTP2_HPACK_ENTRY_OVERHEAD;
-  tbl->first_ent = (tbl->first_ent + 1) % GRPC_CHTTP2_MAX_TABLE_COUNT;
+  size_t elem_bytes = GPR_SLICE_LENGTH(first_ent->key->slice) +
+                      GPR_SLICE_LENGTH(first_ent->value->slice) +
+                      GRPC_CHTTP2_HPACK_ENTRY_OVERHEAD;
+  GPR_ASSERT(elem_bytes <= tbl->mem_used);
+  tbl->mem_used = (gpr_uint16)(tbl->mem_used - elem_bytes);
+  tbl->first_ent =
+      (gpr_uint16)((tbl->first_ent + 1) % GRPC_CHTTP2_MAX_TABLE_COUNT);
   tbl->num_ents--;
   GRPC_MDELEM_UNREF(first_ent);
 }
 
 void grpc_chttp2_hptbl_add(grpc_chttp2_hptbl *tbl, grpc_mdelem *md) {
   /* determine how many bytes of buffer this entry represents */
-  gpr_uint16 elem_bytes = GPR_SLICE_LENGTH(md->key->slice) +
-                          GPR_SLICE_LENGTH(md->value->slice) +
-                          GRPC_CHTTP2_HPACK_ENTRY_OVERHEAD;
+  size_t elem_bytes = GPR_SLICE_LENGTH(md->key->slice) +
+                      GPR_SLICE_LENGTH(md->value->slice) +
+                      GRPC_CHTTP2_HPACK_ENTRY_OVERHEAD;
 
   /* we can't add elements bigger than the max table size */
   if (elem_bytes > tbl->max_bytes) {
@@ -182,7 +185,7 @@ void grpc_chttp2_hptbl_add(grpc_chttp2_hptbl *tbl, grpc_mdelem *md) {
   }
 
   /* evict entries to ensure no overflow */
-  while (elem_bytes > tbl->max_bytes - tbl->mem_used) {
+  while (elem_bytes > (size_t)tbl->max_bytes - tbl->mem_used) {
     evict1(tbl);
   }
 
@@ -190,28 +193,30 @@ void grpc_chttp2_hptbl_add(grpc_chttp2_hptbl *tbl, grpc_mdelem *md) {
   tbl->ents[tbl->last_ent] = md;
 
   /* update accounting values */
-  tbl->last_ent = (tbl->last_ent + 1) % GRPC_CHTTP2_MAX_TABLE_COUNT;
+  tbl->last_ent =
+      (gpr_uint16)((tbl->last_ent + 1) % GRPC_CHTTP2_MAX_TABLE_COUNT);
   tbl->num_ents++;
-  tbl->mem_used += elem_bytes;
+  tbl->mem_used = (gpr_uint16)(tbl->mem_used + elem_bytes);
 }
 
 grpc_chttp2_hptbl_find_result grpc_chttp2_hptbl_find(
     const grpc_chttp2_hptbl *tbl, grpc_mdelem *md) {
   grpc_chttp2_hptbl_find_result r = {0, 0};
-  int i;
+  gpr_uint16 i;
 
   /* See if the string is in the static table */
   for (i = 0; i < GRPC_CHTTP2_LAST_STATIC_ENTRY; i++) {
     grpc_mdelem *ent = tbl->static_ents[i];
     if (md->key != ent->key) continue;
-    r.index = i + 1;
+    r.index = (gpr_uint16)(i + 1);
     r.has_value = md->value == ent->value;
     if (r.has_value) return r;
   }
 
   /* Scan the dynamic table */
   for (i = 0; i < tbl->num_ents; i++) {
-    int idx = tbl->num_ents - i + GRPC_CHTTP2_LAST_STATIC_ENTRY;
+    gpr_uint16 idx =
+        (gpr_uint16)(tbl->num_ents - i + GRPC_CHTTP2_LAST_STATIC_ENTRY);
     grpc_mdelem *ent =
         tbl->ents[(tbl->first_ent + i) % GRPC_CHTTP2_MAX_TABLE_COUNT];
     if (md->key != ent->key) continue;
diff --git a/src/core/transport/chttp2/incoming_metadata.c b/src/core/transport/chttp2/incoming_metadata.c
index 974b864ffb..d216c42113 100644
--- a/src/core/transport/chttp2/incoming_metadata.c
+++ b/src/core/transport/chttp2/incoming_metadata.c
@@ -122,7 +122,7 @@ void grpc_incoming_metadata_buffer_move_to_referencing_sopb(
   for (i = 0; i < sopb->nops; i++) {
     if (sopb->ops[i].type != GRPC_OP_METADATA) continue;
     sopb->ops[i].data.metadata.list.tail =
-        (void *)(delta + (gpr_intptr)sopb->ops[i].data.metadata.list.tail);
+        (void *)(delta + (gpr_uintptr)sopb->ops[i].data.metadata.list.tail);
   }
   src->count = 0;
 }
diff --git a/src/core/transport/chttp2/internal.h b/src/core/transport/chttp2/internal.h
index 7a42de9245..c8c1abb750 100644
--- a/src/core/transport/chttp2/internal.h
+++ b/src/core/transport/chttp2/internal.h
@@ -168,7 +168,7 @@ typedef struct {
   grpc_iomgr_closure *pending_closures_tail;
 
   /** window available for us to send to peer */
-  gpr_uint32 outgoing_window;
+  gpr_int64 outgoing_window;
   /** window available for peer to send to us - updated after parse */
   gpr_uint32 incoming_window;
   /** how much window would we like to have for incoming_window */
@@ -280,7 +280,7 @@ struct grpc_chttp2_transport_parsing {
   gpr_uint32 goaway_last_stream_index;
   gpr_slice goaway_text;
 
-  gpr_uint64 outgoing_window_update;
+  gpr_int64 outgoing_window_update;
 
   /** pings awaiting responses */
   grpc_chttp2_outstanding_ping pings;
@@ -609,20 +609,21 @@ extern int grpc_flowctl_trace;
   else                               \
   stmt
 
-#define GRPC_CHTTP2_FLOWCTL_TRACE_STREAM(reason, transport, context, var,      \
-                                         delta)                                \
-  if (!(grpc_flowctl_trace)) {                                                 \
-  } else {                                                                     \
-    grpc_chttp2_flowctl_trace(__FILE__, __LINE__, reason, #context, #var,      \
-                              transport->is_client, context->id, context->var, \
-                              delta);                                          \
+#define GRPC_CHTTP2_FLOWCTL_TRACE_STREAM(reason, transport, context, var,     \
+                                         delta)                               \
+  if (!(grpc_flowctl_trace)) {                                                \
+  } else {                                                                    \
+    grpc_chttp2_flowctl_trace(__FILE__, __LINE__, reason, #context, #var,     \
+                              transport->is_client, context->id,              \
+                              (gpr_int64)(context->var), (gpr_int64)(delta)); \
   }
 
-#define GRPC_CHTTP2_FLOWCTL_TRACE_TRANSPORT(reason, context, var, delta)   \
-  if (!(grpc_flowctl_trace)) {                                             \
-  } else {                                                                 \
-    grpc_chttp2_flowctl_trace(__FILE__, __LINE__, reason, #context, #var,  \
-                              context->is_client, 0, context->var, delta); \
+#define GRPC_CHTTP2_FLOWCTL_TRACE_TRANSPORT(reason, context, var, delta)      \
+  if (!(grpc_flowctl_trace)) {                                                \
+  } else {                                                                    \
+    grpc_chttp2_flowctl_trace(__FILE__, __LINE__, reason, #context, #var,     \
+                              context->is_client, 0,                          \
+                              (gpr_int64)(context->var), (gpr_int64)(delta)); \
   }
 
 void grpc_chttp2_flowctl_trace(const char *file, int line, const char *reason,
diff --git a/src/core/transport/chttp2/parsing.c b/src/core/transport/chttp2/parsing.c
index dc5eb18e42..a592ce7d28 100644
--- a/src/core/transport/chttp2/parsing.c
+++ b/src/core/transport/chttp2/parsing.c
@@ -131,7 +131,7 @@ void grpc_chttp2_publish_reads(
      published later */
   if (transport_parsing->goaway_received) {
     grpc_chttp2_add_incoming_goaway(transport_global,
-                                    transport_parsing->goaway_error,
+                                    (gpr_uint32)transport_parsing->goaway_error,
                                     transport_parsing->goaway_text);
     transport_parsing->goaway_text = gpr_empty_slice();
     transport_parsing->goaway_received = 0;
@@ -194,7 +194,9 @@ void grpc_chttp2_publish_reads(
       GRPC_CHTTP2_FLOWCTL_TRACE_STREAM(
           "parsed", transport_parsing, stream_parsing, outgoing_window_update,
           -(gpr_int64)stream_parsing->outgoing_window_update);
-      stream_global->outgoing_window += stream_parsing->outgoing_window_update;
+      GPR_ASSERT(stream_parsing->outgoing_window_update <= GPR_UINT32_MAX);
+      stream_global->outgoing_window +=
+          (gpr_uint32)stream_parsing->outgoing_window_update;
       stream_parsing->outgoing_window_update = 0;
       is_zero = stream_global->outgoing_window <= 0;
       if (was_zero && !is_zero) {
@@ -211,7 +213,7 @@ void grpc_chttp2_publish_reads(
     if (stream_parsing->saw_rst_stream) {
       stream_global->cancelled = 1;
       stream_global->cancelled_status = grpc_chttp2_http2_error_to_grpc_status(
-          stream_parsing->rst_stream_reason);
+          (grpc_chttp2_error_code)stream_parsing->rst_stream_reason);
       if (stream_parsing->rst_stream_reason == GRPC_CHTTP2_NO_ERROR) {
         stream_global->published_cancelled = 1;
       }
@@ -379,9 +381,10 @@ int grpc_chttp2_perform_read(grpc_chttp2_transport_parsing *transport_parsing,
     case GRPC_DTS_FRAME:
       GPR_ASSERT(cur < end);
       if ((gpr_uint32)(end - cur) == transport_parsing->incoming_frame_size) {
-        if (!parse_frame_slice(
-                transport_parsing,
-                gpr_slice_sub_no_ref(slice, cur - beg, end - beg), 1)) {
+        if (!parse_frame_slice(transport_parsing,
+                               gpr_slice_sub_no_ref(slice, (size_t)(cur - beg),
+                                                    (size_t)(end - beg)),
+                               1)) {
           return 0;
         }
         transport_parsing->deframe_state = GRPC_DTS_FH_0;
@@ -389,11 +392,12 @@ int grpc_chttp2_perform_read(grpc_chttp2_transport_parsing *transport_parsing,
         return 1;
       } else if ((gpr_uint32)(end - cur) >
                  transport_parsing->incoming_frame_size) {
+        size_t cur_offset = (size_t)(cur - beg);
         if (!parse_frame_slice(
                 transport_parsing,
                 gpr_slice_sub_no_ref(
-                    slice, cur - beg,
-                    cur + transport_parsing->incoming_frame_size - beg),
+                    slice, cur_offset,
+                    cur_offset + transport_parsing->incoming_frame_size),
                 1)) {
           return 0;
         }
@@ -401,12 +405,13 @@ int grpc_chttp2_perform_read(grpc_chttp2_transport_parsing *transport_parsing,
         transport_parsing->incoming_stream = NULL;
         goto dts_fh_0; /* loop */
       } else {
-        if (!parse_frame_slice(
-                transport_parsing,
-                gpr_slice_sub_no_ref(slice, cur - beg, end - beg), 0)) {
+        if (!parse_frame_slice(transport_parsing,
+                               gpr_slice_sub_no_ref(slice, (size_t)(cur - beg),
+                                                    (size_t)(end - beg)),
+                               0)) {
           return 0;
         }
-        transport_parsing->incoming_frame_size -= (end - cur);
+        transport_parsing->incoming_frame_size -= (gpr_uint32)(end - cur);
         return 1;
       }
       gpr_log(GPR_ERROR, "should never reach here");
@@ -474,7 +479,7 @@ static void skip_header(void *tp, grpc_mdelem *md) { GRPC_MDELEM_UNREF(md); }
 static int init_skip_frame_parser(
     grpc_chttp2_transport_parsing *transport_parsing, int is_header) {
   if (is_header) {
-    int is_eoh = transport_parsing->expect_continuation_stream_id != 0;
+    gpr_uint8 is_eoh = transport_parsing->expect_continuation_stream_id != 0;
     transport_parsing->parser = grpc_chttp2_header_parser_parse;
     transport_parsing->parser_data = &transport_parsing->hpack_parser;
     transport_parsing->hpack_parser.on_header = skip_header;
@@ -617,8 +622,8 @@ static void on_header(void *tp, grpc_mdelem *md) {
 
 static int init_header_frame_parser(
     grpc_chttp2_transport_parsing *transport_parsing, int is_continuation) {
-  int is_eoh = (transport_parsing->incoming_frame_flags &
-                GRPC_CHTTP2_DATA_FLAG_END_HEADERS) != 0;
+  gpr_uint8 is_eoh = (transport_parsing->incoming_frame_flags &
+                      GRPC_CHTTP2_DATA_FLAG_END_HEADERS) != 0;
   int via_accept = 0;
   grpc_chttp2_stream_parsing *stream_parsing;
 
diff --git a/src/core/transport/chttp2/stream_encoder.c b/src/core/transport/chttp2/stream_encoder.c
index 1ea697f71e..6a22532bc2 100644
--- a/src/core/transport/chttp2/stream_encoder.c
+++ b/src/core/transport/chttp2/stream_encoder.c
@@ -74,17 +74,18 @@ typedef struct {
 } framer_state;
 
 /* fills p (which is expected to be 9 bytes long) with a data frame header */
-static void fill_header(gpr_uint8 *p, gpr_uint8 type, gpr_uint32 id,
-                        gpr_uint32 len, gpr_uint8 flags) {
-  *p++ = len >> 16;
-  *p++ = len >> 8;
-  *p++ = len;
+static void fill_header(gpr_uint8 *p, gpr_uint8 type, gpr_uint32 id, size_t len,
+                        gpr_uint8 flags) {
+  GPR_ASSERT(len < 16777316);
+  *p++ = (gpr_uint8)(len >> 16);
+  *p++ = (gpr_uint8)(len >> 8);
+  *p++ = (gpr_uint8)(len);
   *p++ = type;
   *p++ = flags;
-  *p++ = id >> 24;
-  *p++ = id >> 16;
-  *p++ = id >> 8;
-  *p++ = id;
+  *p++ = (gpr_uint8)(id >> 24);
+  *p++ = (gpr_uint8)(id >> 16);
+  *p++ = (gpr_uint8)(id >> 8);
+  *p++ = (gpr_uint8)(id);
 }
 
 /* finish a frame - fill in the previously reserved header */
@@ -105,11 +106,12 @@ static void finish_frame(framer_state *st, int is_header_boundary,
     case NONE:
       return;
   }
-  fill_header(GPR_SLICE_START_PTR(st->output->slices[st->header_idx]), type,
-              st->stream_id,
-              st->output->length - st->output_length_at_start_of_frame,
-              (is_last_in_stream ? GRPC_CHTTP2_DATA_FLAG_END_STREAM : 0) |
-                  (is_header_boundary ? GRPC_CHTTP2_DATA_FLAG_END_HEADERS : 0));
+  fill_header(
+      GPR_SLICE_START_PTR(st->output->slices[st->header_idx]), type,
+      st->stream_id, st->output->length - st->output_length_at_start_of_frame,
+      (gpr_uint8)(
+          (is_last_in_stream ? GRPC_CHTTP2_DATA_FLAG_END_STREAM : 0) |
+          (is_header_boundary ? GRPC_CHTTP2_DATA_FLAG_END_HEADERS : 0)));
   st->cur_frame_type = NONE;
 }
 
@@ -134,7 +136,7 @@ static void begin_new_frame(framer_state *st, frame_type type) {
    space to add at least about_to_add bytes -- finishes the current frame if
    needed */
 static void ensure_frame_type(framer_state *st, frame_type type,
-                              int need_bytes) {
+                              size_t need_bytes) {
   if (st->cur_frame_type == type &&
       st->output->length - st->output_length_at_start_of_frame + need_bytes <=
           GRPC_CHTTP2_MAX_PAYLOAD_LENGTH) {
@@ -174,7 +176,7 @@ static void add_header_data(framer_state *st, gpr_slice slice) {
   }
 }
 
-static gpr_uint8 *add_tiny_header_data(framer_state *st, int len) {
+static gpr_uint8 *add_tiny_header_data(framer_state *st, size_t len) {
   ensure_frame_type(st, HEADER, len);
   return gpr_slice_buffer_tiny_add(st->output, len);
 }
@@ -185,10 +187,12 @@ static grpc_mdelem *add_elem(grpc_chttp2_hpack_compressor *c,
   gpr_uint32 key_hash = elem->key->hash;
   gpr_uint32 elem_hash = GRPC_MDSTR_KV_HASH(key_hash, elem->value->hash);
   gpr_uint32 new_index = c->tail_remote_index + c->table_elems + 1;
-  gpr_uint32 elem_size = 32 + GPR_SLICE_LENGTH(elem->key->slice) +
-                         GPR_SLICE_LENGTH(elem->value->slice);
+  size_t elem_size = 32 + GPR_SLICE_LENGTH(elem->key->slice) +
+                     GPR_SLICE_LENGTH(elem->value->slice);
   grpc_mdelem *elem_to_unref;
 
+  GPR_ASSERT(elem_size < 65536);
+
   /* Reserve space for this element in the remote table: if this overflows
      the current table, drop elements until it fits, matching the decompressor
      algorithm */
@@ -200,14 +204,16 @@ static grpc_mdelem *add_elem(grpc_chttp2_hpack_compressor *c,
                c->table_elem_size[c->tail_remote_index %
                                   GRPC_CHTTP2_HPACKC_MAX_TABLE_ELEMS]);
     GPR_ASSERT(c->table_elems > 0);
-    c->table_size -= c->table_elem_size[c->tail_remote_index %
-                                        GRPC_CHTTP2_HPACKC_MAX_TABLE_ELEMS];
+    c->table_size =
+        (gpr_uint16)(c->table_size -
+                     c->table_elem_size[c->tail_remote_index %
+                                        GRPC_CHTTP2_HPACKC_MAX_TABLE_ELEMS]);
     c->table_elems--;
   }
   GPR_ASSERT(c->table_elems < GRPC_CHTTP2_HPACKC_MAX_TABLE_ELEMS);
   c->table_elem_size[new_index % GRPC_CHTTP2_HPACKC_MAX_TABLE_ELEMS] =
-      elem_size;
-  c->table_size += elem_size;
+      (gpr_uint16)elem_size;
+  c->table_size = (gpr_uint16)(c->table_size + elem_size);
   c->table_elems++;
 
   /* Store this element into {entries,indices}_elem */
@@ -270,7 +276,7 @@ static grpc_mdelem *add_elem(grpc_chttp2_hpack_compressor *c,
 
 static void emit_indexed(grpc_chttp2_hpack_compressor *c, gpr_uint32 index,
                          framer_state *st) {
-  int len = GRPC_CHTTP2_VARINT_LENGTH(index, 1);
+  gpr_uint32 len = GRPC_CHTTP2_VARINT_LENGTH(index, 1);
   GRPC_CHTTP2_WRITE_VARINT(index, 1, 0x80, add_tiny_header_data(st, len), len);
 }
 
@@ -288,14 +294,16 @@ static gpr_slice get_wire_value(grpc_mdelem *elem, gpr_uint8 *huffman_prefix) {
 static void emit_lithdr_incidx(grpc_chttp2_hpack_compressor *c,
                                gpr_uint32 key_index, grpc_mdelem *elem,
                                framer_state *st) {
-  int len_pfx = GRPC_CHTTP2_VARINT_LENGTH(key_index, 2);
+  gpr_uint32 len_pfx = GRPC_CHTTP2_VARINT_LENGTH(key_index, 2);
   gpr_uint8 huffman_prefix;
   gpr_slice value_slice = get_wire_value(elem, &huffman_prefix);
-  int len_val = GPR_SLICE_LENGTH(value_slice);
-  int len_val_len = GRPC_CHTTP2_VARINT_LENGTH(len_val, 1);
+  size_t len_val = GPR_SLICE_LENGTH(value_slice);
+  gpr_uint32 len_val_len;
+  GPR_ASSERT(len_val <= GPR_UINT32_MAX);
+  len_val_len = GRPC_CHTTP2_VARINT_LENGTH((gpr_uint32)len_val, 1);
   GRPC_CHTTP2_WRITE_VARINT(key_index, 2, 0x40,
                            add_tiny_header_data(st, len_pfx), len_pfx);
-  GRPC_CHTTP2_WRITE_VARINT(len_val, 1, 0x00,
+  GRPC_CHTTP2_WRITE_VARINT((gpr_uint32)len_val, 1, 0x00,
                            add_tiny_header_data(st, len_val_len), len_val_len);
   add_header_data(st, gpr_slice_ref(value_slice));
 }
@@ -303,26 +311,30 @@ static void emit_lithdr_incidx(grpc_chttp2_hpack_compressor *c,
 static void emit_lithdr_noidx(grpc_chttp2_hpack_compressor *c,
                               gpr_uint32 key_index, grpc_mdelem *elem,
                               framer_state *st) {
-  int len_pfx = GRPC_CHTTP2_VARINT_LENGTH(key_index, 4);
+  gpr_uint32 len_pfx = GRPC_CHTTP2_VARINT_LENGTH(key_index, 4);
   gpr_uint8 huffman_prefix;
   gpr_slice value_slice = get_wire_value(elem, &huffman_prefix);
-  int len_val = GPR_SLICE_LENGTH(value_slice);
-  int len_val_len = GRPC_CHTTP2_VARINT_LENGTH(len_val, 1);
+  size_t len_val = GPR_SLICE_LENGTH(value_slice);
+  gpr_uint32 len_val_len;
+  GPR_ASSERT(len_val <= GPR_UINT32_MAX);
+  len_val_len = GRPC_CHTTP2_VARINT_LENGTH((gpr_uint32)len_val, 1);
   GRPC_CHTTP2_WRITE_VARINT(key_index, 4, 0x00,
                            add_tiny_header_data(st, len_pfx), len_pfx);
-  GRPC_CHTTP2_WRITE_VARINT(len_val, 1, 0x00,
+  GRPC_CHTTP2_WRITE_VARINT((gpr_uint32)len_val, 1, 0x00,
                            add_tiny_header_data(st, len_val_len), len_val_len);
   add_header_data(st, gpr_slice_ref(value_slice));
 }
 
 static void emit_lithdr_incidx_v(grpc_chttp2_hpack_compressor *c,
                                  grpc_mdelem *elem, framer_state *st) {
-  int len_key = GPR_SLICE_LENGTH(elem->key->slice);
+  gpr_uint32 len_key = (gpr_uint32)GPR_SLICE_LENGTH(elem->key->slice);
   gpr_uint8 huffman_prefix;
   gpr_slice value_slice = get_wire_value(elem, &huffman_prefix);
-  int len_val = GPR_SLICE_LENGTH(value_slice);
-  int len_key_len = GRPC_CHTTP2_VARINT_LENGTH(len_key, 1);
-  int len_val_len = GRPC_CHTTP2_VARINT_LENGTH(len_val, 1);
+  gpr_uint32 len_val = (gpr_uint32)GPR_SLICE_LENGTH(value_slice);
+  gpr_uint32 len_key_len = GRPC_CHTTP2_VARINT_LENGTH(len_key, 1);
+  gpr_uint32 len_val_len = GRPC_CHTTP2_VARINT_LENGTH(len_val, 1);
+  GPR_ASSERT(len_key <= GPR_UINT32_MAX);
+  GPR_ASSERT(GPR_SLICE_LENGTH(value_slice) <= GPR_UINT32_MAX);
   *add_tiny_header_data(st, 1) = 0x40;
   GRPC_CHTTP2_WRITE_VARINT(len_key, 1, 0x00,
                            add_tiny_header_data(st, len_key_len), len_key_len);
@@ -334,12 +346,14 @@ static void emit_lithdr_incidx_v(grpc_chttp2_hpack_compressor *c,
 
 static void emit_lithdr_noidx_v(grpc_chttp2_hpack_compressor *c,
                                 grpc_mdelem *elem, framer_state *st) {
-  int len_key = GPR_SLICE_LENGTH(elem->key->slice);
+  gpr_uint32 len_key = (gpr_uint32)GPR_SLICE_LENGTH(elem->key->slice);
   gpr_uint8 huffman_prefix;
   gpr_slice value_slice = get_wire_value(elem, &huffman_prefix);
-  int len_val = GPR_SLICE_LENGTH(value_slice);
-  int len_key_len = GRPC_CHTTP2_VARINT_LENGTH(len_key, 1);
-  int len_val_len = GRPC_CHTTP2_VARINT_LENGTH(len_val, 1);
+  gpr_uint32 len_val = (gpr_uint32)GPR_SLICE_LENGTH(value_slice);
+  gpr_uint32 len_key_len = GRPC_CHTTP2_VARINT_LENGTH(len_key, 1);
+  gpr_uint32 len_val_len = GRPC_CHTTP2_VARINT_LENGTH(len_val, 1);
+  GPR_ASSERT(len_key <= GPR_UINT32_MAX);
+  GPR_ASSERT(GPR_SLICE_LENGTH(value_slice) <= GPR_UINT32_MAX);
   *add_tiny_header_data(st, 1) = 0x00;
   GRPC_CHTTP2_WRITE_VARINT(len_key, 1, 0x00,
                            add_tiny_header_data(st, len_key_len), len_key_len);
@@ -488,7 +502,7 @@ gpr_uint32 grpc_chttp2_preencode(grpc_stream_op *inops, size_t *inops_count,
   gpr_uint32 flow_controlled_bytes_taken = 0;
   gpr_uint32 curop = 0;
   gpr_uint8 *p;
-  int compressed_flag_set = 0;
+  gpr_uint8 compressed_flag_set = 0;
 
   while (curop < *inops_count) {
     GPR_ASSERT(flow_controlled_bytes_taken <= max_flow_controlled_bytes);
@@ -514,10 +528,10 @@ gpr_uint32 grpc_chttp2_preencode(grpc_stream_op *inops, size_t *inops_count,
 
         p = GPR_SLICE_START_PTR(slice);
         p[0] = compressed_flag_set;
-        p[1] = op->data.begin_message.length >> 24;
-        p[2] = op->data.begin_message.length >> 16;
-        p[3] = op->data.begin_message.length >> 8;
-        p[4] = op->data.begin_message.length;
+        p[1] = (gpr_uint8)(op->data.begin_message.length >> 24);
+        p[2] = (gpr_uint8)(op->data.begin_message.length >> 16);
+        p[3] = (gpr_uint8)(op->data.begin_message.length >> 8);
+        p[4] = (gpr_uint8)(op->data.begin_message.length);
         op->type = GRPC_OP_SLICE;
         op->data.slice = slice;
       /* fallthrough */
@@ -541,7 +555,7 @@ gpr_uint32 grpc_chttp2_preencode(grpc_stream_op *inops, size_t *inops_count,
           grpc_sopb_append(outops, op, 1);
           curop++;
         }
-        flow_controlled_bytes_taken += GPR_SLICE_LENGTH(slice);
+        flow_controlled_bytes_taken += (gpr_uint32)GPR_SLICE_LENGTH(slice);
         break;
     }
   }
@@ -565,7 +579,7 @@ void grpc_chttp2_encode(grpc_stream_op *ops, size_t ops_count, int eof,
   framer_state st;
   gpr_slice slice;
   grpc_stream_op *op;
-  gpr_uint32 max_take_size;
+  size_t max_take_size;
   gpr_uint32 curop = 0;
   gpr_uint32 unref_op;
   grpc_mdctx *mdctx = compressor->mdctx;
diff --git a/src/core/transport/chttp2/timeout_encoding.c b/src/core/transport/chttp2/timeout_encoding.c
index 1dd768ada4..8a9b290ecb 100644
--- a/src/core/transport/chttp2/timeout_encoding.c
+++ b/src/core/transport/chttp2/timeout_encoding.c
@@ -123,7 +123,7 @@ void grpc_chttp2_encode_timeout(gpr_timespec timeout, char *buffer) {
     enc_nanos(buffer, timeout.tv_nsec);
   } else if (timeout.tv_sec < 1000 && timeout.tv_nsec != 0) {
     enc_micros(buffer,
-               timeout.tv_sec * 1000000 +
+               (int)(timeout.tv_sec * 1000000) +
                    (timeout.tv_nsec / 1000 + (timeout.tv_nsec % 1000 != 0)));
   } else {
     enc_seconds(buffer, timeout.tv_sec + (timeout.tv_nsec != 0));
@@ -137,14 +137,14 @@ static int is_all_whitespace(const char *p) {
 
 int grpc_chttp2_decode_timeout(const char *buffer, gpr_timespec *timeout) {
   gpr_uint32 x = 0;
-  const char *p = buffer;
+  const gpr_uint8 *p = (const gpr_uint8 *)buffer;
   int have_digit = 0;
   /* skip whitespace */
   for (; *p == ' '; p++)
     ;
   /* decode numeric part */
   for (; *p >= '0' && *p <= '9'; p++) {
-    gpr_uint32 xp = x * 10 + *p - '0';
+    gpr_uint32 xp = x * 10u + (gpr_uint32)*p - (gpr_uint32)'0';
     have_digit = 1;
     if (xp < x) {
       *timeout = gpr_inf_future(GPR_CLOCK_REALTIME);
@@ -180,5 +180,5 @@ int grpc_chttp2_decode_timeout(const char *buffer, gpr_timespec *timeout) {
       return 0;
   }
   p++;
-  return is_all_whitespace(p);
+  return is_all_whitespace((const char *)p);
 }
diff --git a/src/core/transport/chttp2/varint.c b/src/core/transport/chttp2/varint.c
index 0722c9ada9..056f68047b 100644
--- a/src/core/transport/chttp2/varint.c
+++ b/src/core/transport/chttp2/varint.c
@@ -33,7 +33,7 @@
 
 #include "src/core/transport/chttp2/varint.h"
 
-int grpc_chttp2_hpack_varint_length(gpr_uint32 tail_value) {
+gpr_uint32 grpc_chttp2_hpack_varint_length(gpr_uint32 tail_value) {
   if (tail_value < (1 << 7)) {
     return 2;
   } else if (tail_value < (1 << 14)) {
@@ -48,7 +48,8 @@ int grpc_chttp2_hpack_varint_length(gpr_uint32 tail_value) {
 }
 
 void grpc_chttp2_hpack_write_varint_tail(gpr_uint32 tail_value,
-                                         gpr_uint8* target, int tail_length) {
+                                         gpr_uint8* target,
+                                         gpr_uint32 tail_length) {
   switch (tail_length) {
     case 5:
       target[4] = (gpr_uint8)((tail_value >> 28) | 0x80);
diff --git a/src/core/transport/chttp2/varint.h b/src/core/transport/chttp2/varint.h
index 0a6fb55248..4dfcc76773 100644
--- a/src/core/transport/chttp2/varint.h
+++ b/src/core/transport/chttp2/varint.h
@@ -41,10 +41,11 @@
 /* length of a value that needs varint tail encoding (it's bigger than can be
    bitpacked into the opcode byte) - returned value includes the length of the
    opcode byte */
-int grpc_chttp2_hpack_varint_length(gpr_uint32 tail_value);
+gpr_uint32 grpc_chttp2_hpack_varint_length(gpr_uint32 tail_value);
 
 void grpc_chttp2_hpack_write_varint_tail(gpr_uint32 tail_value,
-                                         gpr_uint8* target, int tail_length);
+                                         gpr_uint8* target,
+                                         gpr_uint32 tail_length);
 
 /* maximum value that can be bitpacked with the opcode if the opcode has a
    prefix
@@ -54,15 +55,15 @@ void grpc_chttp2_hpack_write_varint_tail(gpr_uint32 tail_value,
 /* length required to bitpack a value */
 #define GRPC_CHTTP2_VARINT_LENGTH(n, prefix_bits) \
   ((n) < GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits)   \
-       ? 1                                        \
+       ? 1u                                       \
        : grpc_chttp2_hpack_varint_length(         \
              (n)-GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits)))
 
 #define GRPC_CHTTP2_WRITE_VARINT(n, prefix_bits, prefix_or, target, length)   \
   do {                                                                        \
     gpr_uint8* tgt = target;                                                  \
-    if ((length) == 1) {                                                      \
-      (tgt)[0] = (prefix_or) | (n);                                           \
+    if ((length) == 1u) {                                                     \
+      (tgt)[0] = (gpr_uint8)((prefix_or) | (n));                              \
     } else {                                                                  \
       (tgt)[0] = (prefix_or) | GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits);        \
       grpc_chttp2_hpack_write_varint_tail(                                    \
diff --git a/src/core/transport/chttp2/writing.c b/src/core/transport/chttp2/writing.c
index ac79044e08..c015e82931 100644
--- a/src/core/transport/chttp2/writing.c
+++ b/src/core/transport/chttp2/writing.c
@@ -32,10 +32,13 @@
  */
 
 #include "src/core/transport/chttp2/internal.h"
-#include "src/core/transport/chttp2/http2_errors.h"
+
+#include <limits.h>
 
 #include <grpc/support/log.h>
 
+#include "src/core/transport/chttp2/http2_errors.h"
+
 static void finalize_outbuf(grpc_chttp2_transport_writing *transport_writing);
 
 int grpc_chttp2_unlocking_check_writes(
@@ -78,12 +81,13 @@ int grpc_chttp2_unlocking_check_writes(
     stream_writing->send_closed = GRPC_DONT_SEND_CLOSED;
 
     if (stream_global->outgoing_sopb) {
-      window_delta =
-          grpc_chttp2_preencode(stream_global->outgoing_sopb->ops,
-                                &stream_global->outgoing_sopb->nops,
-                                GPR_MIN(transport_global->outgoing_window,
-                                        stream_global->outgoing_window),
-                                &stream_writing->sopb);
+      window_delta = grpc_chttp2_preencode(
+          stream_global->outgoing_sopb->ops,
+          &stream_global->outgoing_sopb->nops,
+          (gpr_uint32)GPR_MIN(GPR_MIN(transport_global->outgoing_window,
+                                      stream_global->outgoing_window),
+                              GPR_UINT32_MAX),
+          &stream_writing->sopb);
       GRPC_CHTTP2_FLOWCTL_TRACE_TRANSPORT(
           "write", transport_global, outgoing_window, -(gpr_int64)window_delta);
       GRPC_CHTTP2_FLOWCTL_TRACE_STREAM("write", transport_global, stream_global,
diff --git a/src/core/transport/chttp2_transport.c b/src/core/transport/chttp2_transport.c
index 9e3d7dd551..deb2fedf0c 100644
--- a/src/core/transport/chttp2_transport.c
+++ b/src/core/transport/chttp2_transport.c
@@ -209,7 +209,7 @@ static void ref_transport(grpc_chttp2_transport *t) { gpr_ref(&t->refs); }
 static void init_transport(grpc_chttp2_transport *t,
                            const grpc_channel_args *channel_args,
                            grpc_endpoint *ep, grpc_mdctx *mdctx,
-                           int is_client) {
+                           gpr_uint8 is_client) {
   size_t i;
   int j;
 
@@ -306,7 +306,7 @@ static void init_transport(grpc_chttp2_transport *t,
                   GRPC_ARG_MAX_CONCURRENT_STREAMS);
         } else {
           push_setting(t, GRPC_CHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS,
-                       channel_args->args[i].value.integer);
+                       (gpr_uint32)channel_args->args[i].value.integer);
         }
       } else if (0 == strcmp(channel_args->args[i].key,
                              GRPC_ARG_HTTP2_INITIAL_SEQUENCE_NUMBER)) {
@@ -320,7 +320,8 @@ static void init_transport(grpc_chttp2_transport *t,
                   t->global.next_stream_id & 1,
                   is_client ? "client" : "server");
         } else {
-          t->global.next_stream_id = channel_args->args[i].value.integer;
+          t->global.next_stream_id =
+              (gpr_uint32)channel_args->args[i].value.integer;
         }
       }
     }
@@ -682,6 +683,8 @@ static void perform_stream_op_locked(
     stream_global->publish_sopb = op->recv_ops;
     stream_global->publish_sopb->nops = 0;
     stream_global->publish_state = op->recv_state;
+    /* clamp max recv bytes */
+    op->max_recv_bytes = GPR_MIN(op->max_recv_bytes, GPR_UINT32_MAX);
     if (stream_global->max_recv_bytes < op->max_recv_bytes) {
       GRPC_CHTTP2_FLOWCTL_TRACE_STREAM(
           "op", transport_global, stream_global, max_recv_bytes,
@@ -690,8 +693,8 @@ static void perform_stream_op_locked(
           "op", transport_global, stream_global, unannounced_incoming_window,
           op->max_recv_bytes - stream_global->max_recv_bytes);
       stream_global->unannounced_incoming_window +=
-          op->max_recv_bytes - stream_global->max_recv_bytes;
-      stream_global->max_recv_bytes = op->max_recv_bytes;
+          (gpr_uint32)op->max_recv_bytes - stream_global->max_recv_bytes;
+      stream_global->max_recv_bytes = (gpr_uint32)op->max_recv_bytes;
     }
     grpc_chttp2_incoming_metadata_live_op_buffer_end(
         &stream_global->outstanding_metadata);
@@ -728,14 +731,14 @@ static void send_ping_locked(grpc_chttp2_transport *t,
   p->next = &t->global.pings;
   p->prev = p->next->prev;
   p->prev->next = p->next->prev = p;
-  p->id[0] = (t->global.ping_counter >> 56) & 0xff;
-  p->id[1] = (t->global.ping_counter >> 48) & 0xff;
-  p->id[2] = (t->global.ping_counter >> 40) & 0xff;
-  p->id[3] = (t->global.ping_counter >> 32) & 0xff;
-  p->id[4] = (t->global.ping_counter >> 24) & 0xff;
-  p->id[5] = (t->global.ping_counter >> 16) & 0xff;
-  p->id[6] = (t->global.ping_counter >> 8) & 0xff;
-  p->id[7] = t->global.ping_counter & 0xff;
+  p->id[0] = (gpr_uint8)((t->global.ping_counter >> 56) & 0xff);
+  p->id[1] = (gpr_uint8)((t->global.ping_counter >> 48) & 0xff);
+  p->id[2] = (gpr_uint8)((t->global.ping_counter >> 40) & 0xff);
+  p->id[3] = (gpr_uint8)((t->global.ping_counter >> 32) & 0xff);
+  p->id[4] = (gpr_uint8)((t->global.ping_counter >> 24) & 0xff);
+  p->id[5] = (gpr_uint8)((t->global.ping_counter >> 16) & 0xff);
+  p->id[6] = (gpr_uint8)((t->global.ping_counter >> 8) & 0xff);
+  p->id[7] = (gpr_uint8)(t->global.ping_counter & 0xff);
   p->on_recv = on_recv;
   gpr_slice_buffer_add(&t->global.qbuf, grpc_chttp2_ping_create(0, p->id));
 }
@@ -760,7 +763,7 @@ static void perform_transport_op(grpc_transport *gt, grpc_transport_op *op) {
     t->global.sent_goaway = 1;
     grpc_chttp2_goaway_append(
         t->global.last_incoming_stream_id,
-        grpc_chttp2_grpc_status_to_http2_error(op->goaway_status),
+        (gpr_uint32)grpc_chttp2_grpc_status_to_http2_error(op->goaway_status),
         gpr_slice_ref(*op->goaway_message), &t->global.qbuf);
     close_transport = !grpc_chttp2_has_streams(t);
   }
@@ -828,8 +831,9 @@ static void remove_stream(grpc_chttp2_transport *t, gpr_uint32 id) {
 
   new_stream_count = grpc_chttp2_stream_map_size(&t->parsing_stream_map) +
                      grpc_chttp2_stream_map_size(&t->new_stream_map);
+  GPR_ASSERT(new_stream_count <= GPR_UINT32_MAX);
   if (new_stream_count != t->global.concurrent_stream_count) {
-    t->global.concurrent_stream_count = new_stream_count;
+    t->global.concurrent_stream_count = (gpr_uint32)new_stream_count;
     maybe_start_some_streams(&t->global);
   }
 }
@@ -942,7 +946,8 @@ static void cancel_from_api(grpc_chttp2_transport_global *transport_global,
     gpr_slice_buffer_add(
         &transport_global->qbuf,
         grpc_chttp2_rst_stream_create(
-            stream_global->id, grpc_chttp2_grpc_status_to_http2_error(status)));
+            stream_global->id,
+            (gpr_uint32)grpc_chttp2_grpc_status_to_http2_error(status)));
   }
   grpc_chttp2_list_add_read_write_state_changed(transport_global,
                                                 stream_global);
@@ -988,14 +993,14 @@ static void close_from_api(grpc_chttp2_transport_global *transport_global,
   *p++ = 's';
   if (status < 10) {
     *p++ = 1;
-    *p++ = '0' + status;
+    *p++ = (gpr_uint8)('0' + status);
   } else {
     *p++ = 2;
-    *p++ = '0' + (status / 10);
-    *p++ = '0' + (status % 10);
+    *p++ = (gpr_uint8)('0' + (status / 10));
+    *p++ = (gpr_uint8)('0' + (status % 10));
   }
   GPR_ASSERT(p == GPR_SLICE_END_PTR(status_hdr));
-  len += GPR_SLICE_LENGTH(status_hdr);
+  len += (gpr_uint32)GPR_SLICE_LENGTH(status_hdr);
 
   if (optional_message) {
     GPR_ASSERT(GPR_SLICE_LENGTH(*optional_message) < 127);
@@ -1015,23 +1020,23 @@ static void close_from_api(grpc_chttp2_transport_global *transport_global,
     *p++ = 'a';
     *p++ = 'g';
     *p++ = 'e';
-    *p++ = GPR_SLICE_LENGTH(*optional_message);
+    *p++ = (gpr_uint8)GPR_SLICE_LENGTH(*optional_message);
     GPR_ASSERT(p == GPR_SLICE_END_PTR(message_pfx));
-    len += GPR_SLICE_LENGTH(message_pfx);
-    len += GPR_SLICE_LENGTH(*optional_message);
+    len += (gpr_uint32)GPR_SLICE_LENGTH(message_pfx);
+    len += (gpr_uint32)GPR_SLICE_LENGTH(*optional_message);
   }
 
   hdr = gpr_slice_malloc(9);
   p = GPR_SLICE_START_PTR(hdr);
-  *p++ = len >> 16;
-  *p++ = len >> 8;
-  *p++ = len;
+  *p++ = (gpr_uint8)(len >> 16);
+  *p++ = (gpr_uint8)(len >> 8);
+  *p++ = (gpr_uint8)(len);
   *p++ = GRPC_CHTTP2_FRAME_HEADER;
   *p++ = GRPC_CHTTP2_DATA_FLAG_END_STREAM | GRPC_CHTTP2_DATA_FLAG_END_HEADERS;
-  *p++ = stream_global->id >> 24;
-  *p++ = stream_global->id >> 16;
-  *p++ = stream_global->id >> 8;
-  *p++ = stream_global->id;
+  *p++ = (gpr_uint8)(stream_global->id >> 24);
+  *p++ = (gpr_uint8)(stream_global->id >> 16);
+  *p++ = (gpr_uint8)(stream_global->id >> 8);
+  *p++ = (gpr_uint8)(stream_global->id);
   GPR_ASSERT(p == GPR_SLICE_END_PTR(hdr));
 
   gpr_slice_buffer_add(&transport_global->qbuf, hdr);
@@ -1120,7 +1125,7 @@ static int recv_data_loop(grpc_chttp2_transport *t, int *success) {
     grpc_chttp2_stream_map_move_into(&t->new_stream_map,
                                      &t->parsing_stream_map);
     t->global.concurrent_stream_count =
-        grpc_chttp2_stream_map_size(&t->parsing_stream_map);
+        (gpr_uint32)grpc_chttp2_stream_map_size(&t->parsing_stream_map);
     if (t->parsing.initial_window_update != 0) {
       grpc_chttp2_stream_map_for_each(&t->parsing_stream_map,
                                       update_global_window, t);
@@ -1277,7 +1282,7 @@ grpc_transport *grpc_create_chttp2_transport(
     const grpc_channel_args *channel_args, grpc_endpoint *ep, grpc_mdctx *mdctx,
     int is_client) {
   grpc_chttp2_transport *t = gpr_malloc(sizeof(grpc_chttp2_transport));
-  init_transport(t, channel_args, ep, mdctx, is_client);
+  init_transport(t, channel_args, ep, mdctx, is_client != 0);
   return &t->base;
 }
 
diff --git a/src/core/transport/metadata.c b/src/core/transport/metadata.c
index 61638764a6..9d135f4356 100644
--- a/src/core/transport/metadata.c
+++ b/src/core/transport/metadata.c
@@ -186,7 +186,8 @@ grpc_mdctx *grpc_mdctx_create(void) {
   /* This seed is used to prevent remote connections from controlling hash table
    * collisions. It needs to be somewhat unpredictable to a remote connection.
    */
-  return grpc_mdctx_create_with_seed(gpr_now(GPR_CLOCK_REALTIME).tv_nsec);
+  return grpc_mdctx_create_with_seed(
+      (gpr_uint32)gpr_now(GPR_CLOCK_REALTIME).tv_nsec);
 }
 
 static void discard_metadata(grpc_mdctx *ctx) {
@@ -333,7 +334,7 @@ grpc_mdstr *grpc_mdstr_from_string(grpc_mdctx *ctx, const char *str,
       grpc_mdstr *ret;
       for (i = 0; i < len; i++) {
         if (str[i] >= 'A' && str[i] <= 'Z') {
-          copy[i] = str[i] - 'A' + 'a';
+          copy[i] = (char)(str[i] - 'A' + 'a');
         } else {
           copy[i] = str[i];
         }
@@ -378,7 +379,7 @@ grpc_mdstr *grpc_mdstr_from_buffer(grpc_mdctx *ctx, const gpr_uint8 *buf,
     s->slice.refcount = NULL;
     memcpy(s->slice.data.inlined.bytes, buf, length);
     s->slice.data.inlined.bytes[length] = 0;
-    s->slice.data.inlined.length = length;
+    s->slice.data.inlined.length = (gpr_uint8)length;
   } else {
     /* string data goes after the internal_string header, and we +1 for null
        terminator */
diff --git a/src/core/transport/transport.h b/src/core/transport/transport.h
index 92c1f38c5e..6e1ec2f64c 100644
--- a/src/core/transport/transport.h
+++ b/src/core/transport/transport.h
@@ -75,7 +75,7 @@ typedef struct grpc_transport_stream_op {
   /** The number of bytes this peer is currently prepared to receive.
       These bytes will be eventually used to replenish per-stream flow control
       windows. */
-  gpr_uint32 max_recv_bytes;
+  size_t max_recv_bytes;
   grpc_iomgr_closure *on_done_recv;
 
   grpc_pollset *bind_pollset;
diff --git a/src/core/tsi/fake_transport_security.c b/src/core/tsi/fake_transport_security.c
index 29127c4269..b1a975155a 100644
--- a/src/core/tsi/fake_transport_security.c
+++ b/src/core/tsi/fake_transport_security.c
@@ -100,7 +100,7 @@ static const char* tsi_fake_handshake_message_to_string(int msg) {
 
 static tsi_result tsi_fake_handshake_message_from_string(
     const char* msg_string, tsi_fake_handshake_message* msg) {
-  int i;
+  tsi_fake_handshake_message i;
   for (i = 0; i < TSI_FAKE_HANDSHAKE_MESSAGE_MAX; i++) {
     if (strncmp(msg_string, tsi_fake_handshake_message_strings[i],
                 strlen(tsi_fake_handshake_message_strings[i])) == 0) {
@@ -171,7 +171,7 @@ static tsi_result fill_frame_from_bytes(const unsigned char* incoming_bytes,
       memcpy(frame->data + frame->offset, bytes_cursor, available_size);
       bytes_cursor += available_size;
       frame->offset += available_size;
-      *incoming_bytes_size = bytes_cursor - incoming_bytes;
+      *incoming_bytes_size = (size_t)(bytes_cursor - incoming_bytes);
       return TSI_INCOMPLETE_DATA;
     }
     memcpy(frame->data + frame->offset, bytes_cursor, to_read_size);
@@ -187,12 +187,12 @@ static tsi_result fill_frame_from_bytes(const unsigned char* incoming_bytes,
     memcpy(frame->data + frame->offset, bytes_cursor, available_size);
     frame->offset += available_size;
     bytes_cursor += available_size;
-    *incoming_bytes_size = bytes_cursor - incoming_bytes;
+    *incoming_bytes_size = (size_t)(bytes_cursor - incoming_bytes);
     return TSI_INCOMPLETE_DATA;
   }
   memcpy(frame->data + frame->offset, bytes_cursor, to_read_size);
   bytes_cursor += to_read_size;
-  *incoming_bytes_size = bytes_cursor - incoming_bytes;
+  *incoming_bytes_size = (size_t)(bytes_cursor - incoming_bytes);
   tsi_fake_frame_reset(frame, 1 /* needs_draining */);
   return TSI_OK;
 }
@@ -219,7 +219,7 @@ static tsi_result bytes_to_frame(unsigned char* bytes, size_t bytes_size,
   frame->offset = 0;
   frame->size = bytes_size + TSI_FAKE_FRAME_HEADER_SIZE;
   if (!tsi_fake_frame_ensure_size(frame)) return TSI_OUT_OF_RESOURCES;
-  store32_little_endian(frame->size, frame->data);
+  store32_little_endian((gpr_uint32)frame->size, frame->data);
   memcpy(frame->data + TSI_FAKE_FRAME_HEADER_SIZE, bytes, bytes_size);
   tsi_fake_frame_reset(frame, 1 /* needs draining */);
   return TSI_OK;
@@ -266,7 +266,7 @@ static tsi_result fake_protector_protect(tsi_frame_protector* self,
   if (frame->size == 0) {
     /* New frame, create a header. */
     size_t written_in_frame_size = 0;
-    store32_little_endian(impl->max_frame_size, frame_header);
+    store32_little_endian((gpr_uint32)impl->max_frame_size, frame_header);
     written_in_frame_size = TSI_FAKE_FRAME_HEADER_SIZE;
     result = fill_frame_from_bytes(frame_header, &written_in_frame_size, frame);
     if (result != TSI_INCOMPLETE_DATA) {
@@ -303,7 +303,8 @@ static tsi_result fake_protector_protect_flush(
     frame->size = frame->offset;
     frame->offset = 0;
     frame->needs_draining = 1;
-    store32_little_endian(frame->size, frame->data); /* Overwrite header. */
+    store32_little_endian((gpr_uint32)frame->size,
+                          frame->data); /* Overwrite header. */
   }
   result = drain_frame_to_bytes(protected_output_frames,
                                 protected_output_frames_size, frame);
@@ -384,7 +385,8 @@ static tsi_result fake_handshaker_get_bytes_to_send_to_peer(
     return TSI_OK;
   }
   if (!impl->outgoing.needs_draining) {
-    int next_message_to_send = impl->next_message_to_send + 2;
+    tsi_fake_handshake_message next_message_to_send =
+        impl->next_message_to_send + 2;
     const char* msg_string =
         tsi_fake_handshake_message_to_string(impl->next_message_to_send);
     result = bytes_to_frame((unsigned char*)msg_string, strlen(msg_string),
diff --git a/src/core/tsi/ssl_transport_security.c b/src/core/tsi/ssl_transport_security.c
index 0b416f6c9d..99ce7ecadf 100644
--- a/src/core/tsi/ssl_transport_security.c
+++ b/src/core/tsi/ssl_transport_security.c
@@ -131,10 +131,13 @@ static unsigned long openssl_thread_id_cb(void) {
 
 static void init_openssl(void) {
   int i;
+  int num_locks;
   SSL_library_init();
   SSL_load_error_strings();
   OpenSSL_add_all_algorithms();
-  openssl_mutexes = malloc(CRYPTO_num_locks() * sizeof(gpr_mu));
+  num_locks = CRYPTO_num_locks();
+  GPR_ASSERT(num_locks > 0);
+  openssl_mutexes = malloc((size_t)num_locks * sizeof(gpr_mu));
   GPR_ASSERT(openssl_mutexes != NULL);
   for (i = 0; i < CRYPTO_num_locks(); i++) {
     gpr_mu_init(&openssl_mutexes[i]);
@@ -249,7 +252,7 @@ static tsi_result ssl_get_x509_common_name(X509* cert, unsigned char** utf8,
     gpr_log(GPR_ERROR, "Could not extract utf8 from asn1 string.");
     return TSI_OUT_OF_RESOURCES;
   }
-  *utf8_size = utf8_returned_size;
+  *utf8_size = (size_t)utf8_returned_size;
   return TSI_OK;
 }
 
@@ -279,8 +282,8 @@ static tsi_result peer_property_from_x509_common_name(
 /* Gets the subject SANs from an X509 cert as a tsi_peer_property. */
 static tsi_result add_subject_alt_names_properties_to_peer(
     tsi_peer* peer, GENERAL_NAMES* subject_alt_names,
-    int subject_alt_name_count) {
-  int i;
+    size_t subject_alt_name_count) {
+  size_t i;
   tsi_result result = TSI_OK;
 
   /* Reset for DNS entries filtering. */
@@ -288,7 +291,7 @@ static tsi_result add_subject_alt_names_properties_to_peer(
 
   for (i = 0; i < subject_alt_name_count; i++) {
     GENERAL_NAME* subject_alt_name =
-        sk_GENERAL_NAME_value(subject_alt_names, i);
+        sk_GENERAL_NAME_value(subject_alt_names, (int)i);
     /* Filter out the non-dns entries names. */
     if (subject_alt_name->type == GEN_DNS) {
       unsigned char* dns_name = NULL;
@@ -301,7 +304,7 @@ static tsi_result add_subject_alt_names_properties_to_peer(
       }
       result = tsi_construct_string_peer_property(
           TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY,
-          (const char*)dns_name, dns_name_size,
+          (const char*)dns_name, (size_t)dns_name_size,
           &peer->properties[peer->property_count++]);
       OPENSSL_free(dns_name);
       if (result != TSI_OK) break;
@@ -318,9 +321,12 @@ static tsi_result peer_from_x509(X509* cert, int include_certificate_type,
       X509_get_ext_d2i(cert, NID_subject_alt_name, 0, 0);
   int subject_alt_name_count =
       (subject_alt_names != NULL) ? sk_GENERAL_NAME_num(subject_alt_names) : 0;
-  size_t property_count = (include_certificate_type ? 1 : 0) +
-                          1 /* common name */ + subject_alt_name_count;
-  tsi_result result = tsi_construct_peer(property_count, peer);
+  size_t property_count;
+  tsi_result result;
+  GPR_ASSERT(subject_alt_name_count >= 0);
+  property_count = (include_certificate_type ? (size_t)1 : 0) +
+                   1 /* common name */ + (size_t)subject_alt_name_count;
+  result = tsi_construct_peer(property_count, peer);
   if (result != TSI_OK) return result;
   do {
     if (include_certificate_type) {
@@ -334,8 +340,8 @@ static tsi_result peer_from_x509(X509* cert, int include_certificate_type,
     if (result != TSI_OK) break;
 
     if (subject_alt_name_count != 0) {
-      result = add_subject_alt_names_properties_to_peer(peer, subject_alt_names,
-                                                        subject_alt_name_count);
+      result = add_subject_alt_names_properties_to_peer(
+          peer, subject_alt_names, (size_t)subject_alt_name_count);
       if (result != TSI_OK) break;
     }
   } while (0);
@@ -360,7 +366,10 @@ static void log_ssl_error_stack(void) {
 /* Performs an SSL_read and handle errors. */
 static tsi_result do_ssl_read(SSL* ssl, unsigned char* unprotected_bytes,
                               size_t* unprotected_bytes_size) {
-  int read_from_ssl = SSL_read(ssl, unprotected_bytes, *unprotected_bytes_size);
+  int read_from_ssl;
+  GPR_ASSERT(*unprotected_bytes_size <= INT_MAX);
+  read_from_ssl =
+      SSL_read(ssl, unprotected_bytes, (int)*unprotected_bytes_size);
   if (read_from_ssl == 0) {
     gpr_log(GPR_ERROR, "SSL_read returned 0 unexpectedly.");
     return TSI_INTERNAL_ERROR;
@@ -387,15 +396,17 @@ static tsi_result do_ssl_read(SSL* ssl, unsigned char* unprotected_bytes,
         return TSI_PROTOCOL_FAILURE;
     }
   }
-  *unprotected_bytes_size = read_from_ssl;
+  *unprotected_bytes_size = (size_t)read_from_ssl;
   return TSI_OK;
 }
 
 /* Performs an SSL_write and handle errors. */
 static tsi_result do_ssl_write(SSL* ssl, unsigned char* unprotected_bytes,
                                size_t unprotected_bytes_size) {
-  int ssl_write_result =
-      SSL_write(ssl, unprotected_bytes, unprotected_bytes_size);
+  int ssl_write_result;
+  GPR_ASSERT(unprotected_bytes_size <= INT_MAX);
+  ssl_write_result =
+      SSL_write(ssl, unprotected_bytes, (int)unprotected_bytes_size);
   if (ssl_write_result < 0) {
     ssl_write_result = SSL_get_error(ssl, ssl_write_result);
     if (ssl_write_result == SSL_ERROR_WANT_READ) {
@@ -417,7 +428,9 @@ static tsi_result ssl_ctx_use_certificate_chain(
     size_t pem_cert_chain_size) {
   tsi_result result = TSI_OK;
   X509* certificate = NULL;
-  BIO* pem = BIO_new_mem_buf((void*)pem_cert_chain, pem_cert_chain_size);
+  BIO* pem;
+  GPR_ASSERT(pem_cert_chain_size <= INT_MAX);
+  pem = BIO_new_mem_buf((void*)pem_cert_chain, (int)pem_cert_chain_size);
   if (pem == NULL) return TSI_OUT_OF_RESOURCES;
 
   do {
@@ -458,7 +471,9 @@ static tsi_result ssl_ctx_use_private_key(SSL_CTX* context,
                                           size_t pem_key_size) {
   tsi_result result = TSI_OK;
   EVP_PKEY* private_key = NULL;
-  BIO* pem = BIO_new_mem_buf((void*)pem_key, pem_key_size);
+  BIO* pem;
+  GPR_ASSERT(pem_key_size <= INT_MAX);
+  pem = BIO_new_mem_buf((void*)pem_key, (int)pem_key_size);
   if (pem == NULL) return TSI_OUT_OF_RESOURCES;
   do {
     private_key = PEM_read_bio_PrivateKey(pem, NULL, NULL, "");
@@ -485,8 +500,11 @@ static tsi_result ssl_ctx_load_verification_certs(
   size_t num_roots = 0;
   X509* root = NULL;
   X509_NAME* root_name = NULL;
-  BIO* pem = BIO_new_mem_buf((void*)pem_roots, pem_roots_size);
-  X509_STORE* root_store = SSL_CTX_get_cert_store(context);
+  BIO* pem;
+  X509_STORE* root_store;
+  GPR_ASSERT(pem_roots_size <= INT_MAX);
+  pem = BIO_new_mem_buf((void*)pem_roots, (int)pem_roots_size);
+  root_store = SSL_CTX_get_cert_store(context);
   if (root_store == NULL) return TSI_INVALID_ARGUMENT;
   if (pem == NULL) return TSI_OUT_OF_RESOURCES;
   if (root_names != NULL) {
@@ -586,7 +604,9 @@ static tsi_result extract_x509_subject_names_from_pem_cert(
     const unsigned char* pem_cert, size_t pem_cert_size, tsi_peer* peer) {
   tsi_result result = TSI_OK;
   X509* cert = NULL;
-  BIO* pem = BIO_new_mem_buf((void*)pem_cert, pem_cert_size);
+  BIO* pem;
+  GPR_ASSERT(pem_cert_size <= INT_MAX);
+  pem = BIO_new_mem_buf((void*)pem_cert, (int)pem_cert_size);
   if (pem == NULL) return TSI_OUT_OF_RESOURCES;
 
   cert = PEM_read_bio_X509(pem, NULL, NULL, "");
@@ -616,7 +636,7 @@ static tsi_result build_alpn_protocol_name_list(
       gpr_log(GPR_ERROR, "Invalid 0-length protocol name.");
       return TSI_INVALID_ARGUMENT;
     }
-    *protocol_name_list_length += alpn_protocols_lengths[i] + 1;
+    *protocol_name_list_length += (size_t)alpn_protocols_lengths[i] + 1;
   }
   *protocol_name_list = malloc(*protocol_name_list_length);
   if (*protocol_name_list == NULL) return TSI_OUT_OF_RESOURCES;
@@ -648,17 +668,18 @@ static tsi_result ssl_protector_protect(tsi_frame_protector* self,
   tsi_result result = TSI_OK;
 
   /* First see if we have some pending data in the SSL BIO. */
-  size_t pending_in_ssl = BIO_pending(impl->from_ssl);
+  int pending_in_ssl = BIO_pending(impl->from_ssl);
   if (pending_in_ssl > 0) {
     *unprotected_bytes_size = 0;
+    GPR_ASSERT(*protected_output_frames_size <= INT_MAX);
     read_from_ssl = BIO_read(impl->from_ssl, protected_output_frames,
-                             *protected_output_frames_size);
+                             (int)*protected_output_frames_size);
     if (read_from_ssl < 0) {
       gpr_log(GPR_ERROR,
               "Could not read from BIO even though some data is pending");
       return TSI_INTERNAL_ERROR;
     }
-    *protected_output_frames_size = read_from_ssl;
+    *protected_output_frames_size = (size_t)read_from_ssl;
     return TSI_OK;
   }
 
@@ -678,13 +699,14 @@ static tsi_result ssl_protector_protect(tsi_frame_protector* self,
   result = do_ssl_write(impl->ssl, impl->buffer, impl->buffer_size);
   if (result != TSI_OK) return result;
 
+  GPR_ASSERT(*protected_output_frames_size <= INT_MAX);
   read_from_ssl = BIO_read(impl->from_ssl, protected_output_frames,
-                           *protected_output_frames_size);
+                           (int)*protected_output_frames_size);
   if (read_from_ssl < 0) {
     gpr_log(GPR_ERROR, "Could not read from BIO after SSL_write.");
     return TSI_INTERNAL_ERROR;
   }
-  *protected_output_frames_size = read_from_ssl;
+  *protected_output_frames_size = (size_t)read_from_ssl;
   *unprotected_bytes_size = available;
   impl->buffer_offset = 0;
   return TSI_OK;
@@ -696,6 +718,7 @@ static tsi_result ssl_protector_protect_flush(
   tsi_result result = TSI_OK;
   tsi_ssl_frame_protector* impl = (tsi_ssl_frame_protector*)self;
   int read_from_ssl = 0;
+  int pending;
 
   if (impl->buffer_offset != 0) {
     result = do_ssl_write(impl->ssl, impl->buffer, impl->buffer_offset);
@@ -703,17 +726,22 @@ static tsi_result ssl_protector_protect_flush(
     impl->buffer_offset = 0;
   }
 
-  *still_pending_size = BIO_pending(impl->from_ssl);
+  pending = BIO_pending(impl->from_ssl);
+  GPR_ASSERT(pending >= 0);
+  *still_pending_size = (size_t)pending;
   if (*still_pending_size == 0) return TSI_OK;
 
+  GPR_ASSERT(*protected_output_frames_size <= INT_MAX);
   read_from_ssl = BIO_read(impl->from_ssl, protected_output_frames,
-                           *protected_output_frames_size);
+                           (int)*protected_output_frames_size);
   if (read_from_ssl <= 0) {
     gpr_log(GPR_ERROR, "Could not read from BIO after SSL_write.");
     return TSI_INTERNAL_ERROR;
   }
-  *protected_output_frames_size = read_from_ssl;
-  *still_pending_size = BIO_pending(impl->from_ssl);
+  *protected_output_frames_size = (size_t)read_from_ssl;
+  pending = BIO_pending(impl->from_ssl);
+  GPR_ASSERT(pending >= 0);
+  *still_pending_size = (size_t)pending;
   return TSI_OK;
 }
 
@@ -740,14 +768,15 @@ static tsi_result ssl_protector_unprotect(
   *unprotected_bytes_size = output_bytes_size - output_bytes_offset;
 
   /* Then, try to write some data to ssl. */
+  GPR_ASSERT(*protected_frames_bytes_size <= INT_MAX);
   written_into_ssl = BIO_write(impl->into_ssl, protected_frames_bytes,
-                               *protected_frames_bytes_size);
+                               (int)*protected_frames_bytes_size);
   if (written_into_ssl < 0) {
     gpr_log(GPR_ERROR, "Sending protected frame to ssl failed with %d",
             written_into_ssl);
     return TSI_INTERNAL_ERROR;
   }
-  *protected_frames_bytes_size = written_into_ssl;
+  *protected_frames_bytes_size = (size_t)written_into_ssl;
 
   /* Now try to read some data again. */
   result = do_ssl_read(impl->ssl, unprotected_bytes, unprotected_bytes_size);
@@ -781,7 +810,8 @@ static tsi_result ssl_handshaker_get_bytes_to_send_to_peer(tsi_handshaker* self,
       *bytes_size > INT_MAX) {
     return TSI_INVALID_ARGUMENT;
   }
-  bytes_read_from_ssl = BIO_read(impl->from_ssl, bytes, *bytes_size);
+  GPR_ASSERT(*bytes_size <= INT_MAX);
+  bytes_read_from_ssl = BIO_read(impl->from_ssl, bytes, (int)*bytes_size);
   if (bytes_read_from_ssl < 0) {
     *bytes_size = 0;
     if (!BIO_should_retry(impl->from_ssl)) {
@@ -811,13 +841,15 @@ static tsi_result ssl_handshaker_process_bytes_from_peer(
   if (bytes == NULL || bytes_size == 0 || *bytes_size > INT_MAX) {
     return TSI_INVALID_ARGUMENT;
   }
-  bytes_written_into_ssl_size = BIO_write(impl->into_ssl, bytes, *bytes_size);
+  GPR_ASSERT(*bytes_size <= INT_MAX);
+  bytes_written_into_ssl_size =
+      BIO_write(impl->into_ssl, bytes, (int)*bytes_size);
   if (bytes_written_into_ssl_size < 0) {
     gpr_log(GPR_ERROR, "Could not write to memory BIO.");
     impl->result = TSI_INTERNAL_ERROR;
     return impl->result;
   }
-  *bytes_size = bytes_written_into_ssl_size;
+  *bytes_size = (size_t)bytes_written_into_ssl_size;
 
   if (!tsi_handshaker_is_in_progress(self)) {
     impl->result = TSI_OK;
@@ -1033,9 +1065,9 @@ static tsi_result create_tsi_ssl_handshaker(SSL_CTX* ctx, int is_client,
 static int select_protocol_list(const unsigned char** out,
                                 unsigned char* outlen,
                                 const unsigned char* client_list,
-                                unsigned int client_list_len,
+                                size_t client_list_len,
                                 const unsigned char* server_list,
-                                unsigned int server_list_len) {
+                                size_t server_list_len) {
   const unsigned char* client_current = client_list;
   while ((unsigned int)(client_current - client_list) < client_list_len) {
     unsigned char client_current_len = *(client_current++);
@@ -1208,7 +1240,8 @@ static int server_handshaker_factory_npn_advertised_callback(
   tsi_ssl_server_handshaker_factory* factory =
       (tsi_ssl_server_handshaker_factory*)arg;
   *out = factory->alpn_protocol_list;
-  *outlen = factory->alpn_protocol_list_length;
+  GPR_ASSERT(factory->alpn_protocol_list_length <= UINT_MAX);
+  *outlen = (unsigned int)factory->alpn_protocol_list_length;
   return SSL_TLSEXT_ERR_OK;
 }
 
@@ -1266,8 +1299,10 @@ tsi_result tsi_create_ssl_client_handshaker_factory(
         break;
       }
 #if TSI_OPENSSL_ALPN_SUPPORT
-      if (SSL_CTX_set_alpn_protos(ssl_context, impl->alpn_protocol_list,
-                                  impl->alpn_protocol_list_length)) {
+      GPR_ASSERT(impl->alpn_protocol_list_length < UINT_MAX);
+      if (SSL_CTX_set_alpn_protos(
+              ssl_context, impl->alpn_protocol_list,
+              (unsigned int)impl->alpn_protocol_list_length)) {
         gpr_log(GPR_ERROR, "Could not set alpn protocol list to context.");
         result = TSI_INVALID_ARGUMENT;
         break;
diff --git a/src/cpp/server/secure_server_credentials.cc b/src/cpp/server/secure_server_credentials.cc
index dfa9229c98..90afebfd2e 100644
--- a/src/cpp/server/secure_server_credentials.cc
+++ b/src/cpp/server/secure_server_credentials.cc
@@ -101,7 +101,9 @@ void AuthMetadataProcessorAyncWrapper::InvokeProcessor(
                            0,
                            {{nullptr, nullptr, nullptr, nullptr}}});
   }
-  cb(user_data, &consumed_md[0], consumed_md.size(), &response_md[0],
+  auto consumed_md_data = consumed_md.empty() ? nullptr : &consumed_md[0];
+  auto response_md_data = response_md.empty() ? nullptr : &response_md[0];
+  cb(user_data, consumed_md_data, consumed_md.size(), response_md_data,
      response_md.size(), static_cast<grpc_status_code>(status.error_code()),
      status.error_message().c_str());
 }
@@ -130,8 +132,8 @@ std::shared_ptr<ServerCredentials> SslServerCredentials(
   }
   grpc_server_credentials* c_creds = grpc_ssl_server_credentials_create(
       options.pem_root_certs.empty() ? nullptr : options.pem_root_certs.c_str(),
-      &pem_key_cert_pairs[0], pem_key_cert_pairs.size(),
-      options.force_client_auth, nullptr);
+      pem_key_cert_pairs.empty() ? nullptr : &pem_key_cert_pairs[0],
+      pem_key_cert_pairs.size(), options.force_client_auth, nullptr);
   return std::shared_ptr<ServerCredentials>(
       new SecureServerCredentials(c_creds));
 }
diff --git a/src/cpp/server/server.cc b/src/cpp/server/server.cc
index d67205e822..a3020c342b 100644
--- a/src/cpp/server/server.cc
+++ b/src/cpp/server/server.cc
@@ -252,28 +252,36 @@ class Server::SyncRequest GRPC_FINAL : public CompletionQueueTag {
   grpc_completion_queue* cq_;
 };
 
-static grpc_server* CreateServer(int max_message_size) {
+static grpc_server* CreateServer(
+    int max_message_size, const grpc_compression_options& compression_options) {
+  grpc_arg args[2];
+  size_t args_idx = 0;
   if (max_message_size > 0) {
-    grpc_arg arg;
-    arg.type = GRPC_ARG_INTEGER;
-    arg.key = const_cast<char*>(GRPC_ARG_MAX_MESSAGE_LENGTH);
-    arg.value.integer = max_message_size;
-    grpc_channel_args args = {1, &arg};
-    return grpc_server_create(&args, nullptr);
-  } else {
-    return grpc_server_create(nullptr, nullptr);
+    args[args_idx].type = GRPC_ARG_INTEGER;
+    args[args_idx].key = const_cast<char*>(GRPC_ARG_MAX_MESSAGE_LENGTH);
+    args[args_idx].value.integer = max_message_size;
+    args_idx++;
   }
+
+  args[args_idx].type = GRPC_ARG_INTEGER;
+  args[args_idx].key = const_cast<char*>(GRPC_COMPRESSION_ALGORITHM_STATE_ARG);
+  args[args_idx].value.integer = compression_options.enabled_algorithms_bitset;
+  args_idx++;
+
+  grpc_channel_args channel_args = {args_idx, args};
+  return grpc_server_create(&channel_args, nullptr);
 }
 
 Server::Server(ThreadPoolInterface* thread_pool, bool thread_pool_owned,
-               int max_message_size)
+               int max_message_size,
+               grpc_compression_options compression_options)
     : max_message_size_(max_message_size),
       started_(false),
       shutdown_(false),
       num_running_cb_(0),
       sync_methods_(new std::list<SyncRequest>),
       has_generic_service_(false),
-      server_(CreateServer(max_message_size)),
+      server_(CreateServer(max_message_size, compression_options)),
       thread_pool_(thread_pool),
       thread_pool_owned_(thread_pool_owned) {
   grpc_server_register_completion_queue(server_, cq_.cq(), nullptr);
diff --git a/src/cpp/server/server_builder.cc b/src/cpp/server/server_builder.cc
index b739cbfe62..1c7e4e4eb6 100644
--- a/src/cpp/server/server_builder.cc
+++ b/src/cpp/server/server_builder.cc
@@ -43,7 +43,9 @@
 namespace grpc {
 
 ServerBuilder::ServerBuilder()
-    : max_message_size_(-1), generic_service_(nullptr), thread_pool_(nullptr) {}
+    : max_message_size_(-1), generic_service_(nullptr), thread_pool_(nullptr) {
+      grpc_compression_options_init(&compression_options_);
+}
 
 std::unique_ptr<ServerCompletionQueue> ServerBuilder::AddCompletionQueue() {
   ServerCompletionQueue* cq = new ServerCompletionQueue();
@@ -99,8 +101,9 @@ std::unique_ptr<Server> ServerBuilder::BuildAndStart() {
     thread_pool_ = CreateDefaultThreadPool();
     thread_pool_owned = true;
   }
-  std::unique_ptr<Server> server(
-      new Server(thread_pool_, thread_pool_owned, max_message_size_));
+  std::unique_ptr<Server> server(new Server(thread_pool_, thread_pool_owned,
+                                            max_message_size_,
+                                            compression_options_));
   for (auto cq = cqs_.begin(); cq != cqs_.end(); ++cq) {
     grpc_server_register_completion_queue(server->server_, (*cq)->cq(),
                                           nullptr);
@@ -128,7 +131,8 @@ std::unique_ptr<Server> ServerBuilder::BuildAndStart() {
       *port->selected_port = r;
     }
   }
-  if (!server->Start(&cqs_[0], cqs_.size())) {
+  auto cqs_data = cqs_.empty() ? nullptr : &cqs_[0];
+  if (!server->Start(cqs_data, cqs_.size())) {
     return nullptr;
   }
   return server;
diff --git a/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj b/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
index a5945be922..a0bcf431f7 100644
--- a/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
+++ b/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
@@ -42,6 +42,9 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\packages\BouncyCastle.1.7.0\lib\Net40-Client\BouncyCastle.Crypto.dll</HintPath>
     </Reference>
+    <Reference Include="CommandLine">
+      <HintPath>..\packages\CommandLineParser.1.9.71\lib\net45\CommandLine.dll</HintPath>
+    </Reference>
     <Reference Include="Google.Apis.Auth, Version=1.9.3.19379, Culture=neutral, PublicKeyToken=4b01fa6e34db77ab, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\packages\Google.Apis.Auth.1.9.3\lib\net40\Google.Apis.Auth.dll</HintPath>
diff --git a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
index 8343e54122..0884c6ea60 100644
--- a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
+++ b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
@@ -37,6 +37,7 @@ using System.Text.RegularExpressions;
 using System.Threading;
 using System.Threading.Tasks;
 
+using CommandLine;
 using Google.Apis.Auth.OAuth2;
 using Google.Protobuf;
 using Grpc.Auth;
@@ -44,25 +45,54 @@ using Grpc.Core;
 using Grpc.Core.Utils;
 using Grpc.Testing;
 using NUnit.Framework;
+using CommandLine.Text;
+using System.IO;
 
 namespace Grpc.IntegrationTesting
 {
     public class InteropClient
     {
-        private const string ServiceAccountUser = "155450119199-3psnrh1sdr3d8cpj1v46naggf81mhdnk@developer.gserviceaccount.com";
-        private const string ComputeEngineUser = "155450119199-r5aaqa2vqoa9g5mv2m6s3m1l293rlmel@developer.gserviceaccount.com";
-        private const string AuthScope = "https://www.googleapis.com/auth/xapi.zoo";
-        private const string AuthScopeResponse = "xapi.zoo";
-
         private class ClientOptions
         {
-            public bool help;
-            public string serverHost = "127.0.0.1";
-            public string serverHostOverride = TestCredentials.DefaultHostOverride;
-            public int? serverPort;
-            public string testCase = "large_unary";
-            public bool useTls;
-            public bool useTestCa;
+            [Option("server_host", DefaultValue = "127.0.0.1")]
+            public string ServerHost { get; set; }
+
+            [Option("server_host_override", DefaultValue = TestCredentials.DefaultHostOverride)]
+            public string ServerHostOverride { get; set; }
+
+            [Option("server_port", Required = true)]
+            public int ServerPort { get; set; }
+
+            [Option("test_case", DefaultValue = "large_unary")]
+            public string TestCase { get; set; }
+
+            [Option("use_tls")]
+            public bool UseTls { get; set; }
+
+            [Option("use_test_ca")]
+            public bool UseTestCa { get; set; }
+
+            [Option("default_service_account", Required = false)]
+            public string DefaultServiceAccount { get; set; }
+
+            [Option("oauth_scope", Required = false)]
+            public string OAuthScope { get; set; }
+
+            [Option("service_account_key_file", Required = false)]
+            public string ServiceAccountKeyFile { get; set; }
+
+            [HelpOption]
+            public string GetUsage()
+            {
+                var help = new HelpText
+                {
+                    Heading = "gRPC C# interop testing client",
+                    AddDashesToOption = true
+                };
+                help.AddPreOptionsLine("Usage:");
+                help.AddOptions(this);
+                return help;
+            }
         }
 
         ClientOptions options;
@@ -74,26 +104,9 @@ namespace Grpc.IntegrationTesting
 
         public static void Run(string[] args)
         {
-            Console.WriteLine("gRPC C# interop testing client");
-            ClientOptions options = ParseArguments(args);
-
-            if (options.serverHost == null || !options.serverPort.HasValue || options.testCase == null)
-            {
-                Console.WriteLine("Missing required argument.");
-                Console.WriteLine();
-                options.help = true;
-            }
-
-            if (options.help)
+            var options = new ClientOptions();
+            if (!Parser.Default.ParseArguments(args, options))
             {
-                Console.WriteLine("Usage:");
-                Console.WriteLine("  --server_host=HOSTNAME");
-                Console.WriteLine("  --server_host_override=HOSTNAME");
-                Console.WriteLine("  --server_port=PORT");
-                Console.WriteLine("  --test_case=TESTCASE");
-                Console.WriteLine("  --use_tls=BOOLEAN");
-                Console.WriteLine("  --use_test_ca=BOOLEAN");
-                Console.WriteLine();
                 Environment.Exit(1);
             }
 
@@ -103,30 +116,27 @@ namespace Grpc.IntegrationTesting
 
         private async Task Run()
         {
-            Credentials credentials = null;
-            if (options.useTls)
-            {
-                credentials = TestCredentials.CreateTestClientCredentials(options.useTestCa);
-            }
-
+            var credentials = options.UseTls ? TestCredentials.CreateTestClientCredentials(options.UseTestCa) : Credentials.Insecure;
+            
             List<ChannelOption> channelOptions = null;
-            if (!string.IsNullOrEmpty(options.serverHostOverride))
+            if (!string.IsNullOrEmpty(options.ServerHostOverride))
             {
                 channelOptions = new List<ChannelOption>
                 {
-                    new ChannelOption(ChannelOptions.SslTargetNameOverride, options.serverHostOverride)
+                    new ChannelOption(ChannelOptions.SslTargetNameOverride, options.ServerHostOverride)
                 };
             }
-
-            var channel = new Channel(options.serverHost, options.serverPort.Value, credentials, channelOptions);
+            Console.WriteLine(options.ServerHost);
+            Console.WriteLine(options.ServerPort);
+            var channel = new Channel(options.ServerHost, options.ServerPort, credentials, channelOptions);
             TestService.TestServiceClient client = new TestService.TestServiceClient(channel);
-            await RunTestCaseAsync(options.testCase, client);
+            await RunTestCaseAsync(client, options);
             channel.ShutdownAsync().Wait();
         }
 
-        private async Task RunTestCaseAsync(string testCase, TestService.TestServiceClient client)
+        private async Task RunTestCaseAsync(TestService.TestServiceClient client, ClientOptions options)
         {
-            switch (testCase)
+            switch (options.TestCase)
             {
                 case "empty_unary":
                     RunEmptyUnary(client);
@@ -146,20 +156,17 @@ namespace Grpc.IntegrationTesting
                 case "empty_stream":
                     await RunEmptyStreamAsync(client);
                     break;
-                case "service_account_creds":
-                    await RunServiceAccountCredsAsync(client);
-                    break;
                 case "compute_engine_creds":
-                    await RunComputeEngineCredsAsync(client);
+                    await RunComputeEngineCredsAsync(client, options.DefaultServiceAccount, options.OAuthScope);
                     break;
                 case "jwt_token_creds":
-                    await RunJwtTokenCredsAsync(client);
+                    await RunJwtTokenCredsAsync(client, options.DefaultServiceAccount);
                     break;
                 case "oauth2_auth_token":
-                    await RunOAuth2AuthTokenAsync(client);
+                    await RunOAuth2AuthTokenAsync(client, options.DefaultServiceAccount, options.OAuthScope);
                     break;
                 case "per_rpc_creds":
-                    await RunPerRpcCredsAsync(client);
+                    await RunPerRpcCredsAsync(client, options.DefaultServiceAccount, options.OAuthScope);
                     break;
                 case "cancel_after_begin":
                     await RunCancelAfterBeginAsync(client);
@@ -174,7 +181,7 @@ namespace Grpc.IntegrationTesting
                     RunBenchmarkEmptyUnary(client);
                     break;
                 default:
-                    throw new ArgumentException("Unknown test case " + testCase);
+                    throw new ArgumentException("Unknown test case " + options.TestCase);
             }
         }
 
@@ -313,32 +320,7 @@ namespace Grpc.IntegrationTesting
             Console.WriteLine("Passed!");
         }
 
-        public static async Task RunServiceAccountCredsAsync(TestService.TestServiceClient client)
-        {
-            Console.WriteLine("running service_account_creds");
-            var credential = await GoogleCredential.GetApplicationDefaultAsync();
-            credential = credential.CreateScoped(new[] { AuthScope });
-            client.HeaderInterceptor = AuthInterceptors.FromCredential(credential);
-
-            var request = new SimpleRequest
-            {
-                ResponseType = PayloadType.COMPRESSABLE,
-                ResponseSize = 314159,
-                Payload = CreateZerosPayload(271828),
-                FillUsername = true,
-                FillOauthScope = true
-            };
-
-            var response = client.UnaryCall(request);
-
-            Assert.AreEqual(PayloadType.COMPRESSABLE, response.Payload.Type);
-            Assert.AreEqual(314159, response.Payload.Body.Length);
-            Assert.AreEqual(AuthScopeResponse, response.OauthScope);
-            Assert.AreEqual(ServiceAccountUser, response.Username);
-            Console.WriteLine("Passed!");
-        }
-
-        public static async Task RunComputeEngineCredsAsync(TestService.TestServiceClient client)
+        public static async Task RunComputeEngineCredsAsync(TestService.TestServiceClient client, string defaultServiceAccount, string oauthScope)
         {
             Console.WriteLine("running compute_engine_creds");
             var credential = await GoogleCredential.GetApplicationDefaultAsync();
@@ -358,16 +340,16 @@ namespace Grpc.IntegrationTesting
 
             Assert.AreEqual(PayloadType.COMPRESSABLE, response.Payload.Type);
             Assert.AreEqual(314159, response.Payload.Body.Length);
-            Assert.AreEqual(AuthScopeResponse, response.OauthScope);
-            Assert.AreEqual(ComputeEngineUser, response.Username);
+            Assert.False(string.IsNullOrEmpty(response.OauthScope));
+            Assert.True(oauthScope.Contains(response.OauthScope));
+            Assert.AreEqual(defaultServiceAccount, response.Username);
             Console.WriteLine("Passed!");
         }
 
-        public static async Task RunJwtTokenCredsAsync(TestService.TestServiceClient client)
+        public static async Task RunJwtTokenCredsAsync(TestService.TestServiceClient client, string defaultServiceAccount)
         {
             Console.WriteLine("running jwt_token_creds");
             var credential = await GoogleCredential.GetApplicationDefaultAsync();
-            // check this a credential with scope support, but don't add the scope.
             Assert.IsTrue(credential.IsCreateScopedRequired);
             client.HeaderInterceptor = AuthInterceptors.FromCredential(credential);
 
@@ -377,21 +359,20 @@ namespace Grpc.IntegrationTesting
                 ResponseSize = 314159,
                 Payload = CreateZerosPayload(271828),
                 FillUsername = true,
-                FillOauthScope = true
             };
 
             var response = client.UnaryCall(request);
 
             Assert.AreEqual(PayloadType.COMPRESSABLE, response.Payload.Type);
             Assert.AreEqual(314159, response.Payload.Body.Length);
-            Assert.AreEqual(ServiceAccountUser, response.Username);
+            Assert.AreEqual(defaultServiceAccount, response.Username);
             Console.WriteLine("Passed!");
         }
 
-        public static async Task RunOAuth2AuthTokenAsync(TestService.TestServiceClient client)
+        public static async Task RunOAuth2AuthTokenAsync(TestService.TestServiceClient client, string defaultServiceAccount, string oauthScope)
         {
             Console.WriteLine("running oauth2_auth_token");
-            ITokenAccess credential = (await GoogleCredential.GetApplicationDefaultAsync()).CreateScoped(new[] { AuthScope });
+            ITokenAccess credential = (await GoogleCredential.GetApplicationDefaultAsync()).CreateScoped(new[] { oauthScope });
             string oauth2Token = await credential.GetAccessTokenForRequestAsync();
 
             client.HeaderInterceptor = AuthInterceptors.FromAccessToken(oauth2Token);
@@ -404,31 +385,29 @@ namespace Grpc.IntegrationTesting
 
             var response = client.UnaryCall(request);
 
-            Assert.AreEqual(AuthScopeResponse, response.OauthScope);
-            Assert.AreEqual(ServiceAccountUser, response.Username);
+            Assert.False(string.IsNullOrEmpty(response.OauthScope));
+            Assert.True(oauthScope.Contains(response.OauthScope));
+            Assert.AreEqual(defaultServiceAccount, response.Username);
             Console.WriteLine("Passed!");
         }
 
-        public static async Task RunPerRpcCredsAsync(TestService.TestServiceClient client)
+        public static async Task RunPerRpcCredsAsync(TestService.TestServiceClient client, string defaultServiceAccount, string oauthScope)
         {
             Console.WriteLine("running per_rpc_creds");
-
-            ITokenAccess credential = (await GoogleCredential.GetApplicationDefaultAsync()).CreateScoped(new[] { AuthScope });
-            string oauth2Token = await credential.GetAccessTokenForRequestAsync();
-            var headerInterceptor = AuthInterceptors.FromAccessToken(oauth2Token);
+            ITokenAccess credential = (await GoogleCredential.GetApplicationDefaultAsync()).CreateScoped(new[] { oauthScope });
+            string accessToken = await credential.GetAccessTokenForRequestAsync();
+            var headerInterceptor = AuthInterceptors.FromAccessToken(accessToken);
 
             var request = new SimpleRequest
             {
                 FillUsername = true,
-                FillOauthScope = true
             };
 
             var headers = new Metadata();
             headerInterceptor(null, "", headers);
             var response = client.UnaryCall(request, headers: headers);
 
-            Assert.AreEqual(AuthScopeResponse, response.OauthScope);
-            Assert.AreEqual(ServiceAccountUser, response.Username);
+            Assert.AreEqual(defaultServiceAccount, response.Username);
             Console.WriteLine("Passed!");
         }
 
@@ -508,68 +487,5 @@ namespace Grpc.IntegrationTesting
         {
             return new Payload { Body = ByteString.CopyFrom(new byte[size]) };
         }
-
-        private static ClientOptions ParseArguments(string[] args)
-        {
-            var options = new ClientOptions();
-            foreach (string arg in args)
-            {
-                ParseArgument(arg, options);
-                if (options.help)
-                {
-                    break;
-                }
-            }
-            return options;
-        }
-
-        private static void ParseArgument(string arg, ClientOptions options)
-        {
-            Match match;
-            match = Regex.Match(arg, "--server_host=(.*)");
-            if (match.Success)
-            {
-                options.serverHost = match.Groups[1].Value.Trim();
-                return;
-            }
-
-            match = Regex.Match(arg, "--server_host_override=(.*)");
-            if (match.Success)
-            {
-                options.serverHostOverride = match.Groups[1].Value.Trim();
-                return;
-            }
-
-            match = Regex.Match(arg, "--server_port=(.*)");
-            if (match.Success)
-            {
-                options.serverPort = int.Parse(match.Groups[1].Value.Trim());
-                return;
-            }
-
-            match = Regex.Match(arg, "--test_case=(.*)");
-            if (match.Success)
-            {
-                options.testCase = match.Groups[1].Value.Trim();
-                return;
-            }
-
-            match = Regex.Match(arg, "--use_tls=(.*)");
-            if (match.Success)
-            {
-                options.useTls = bool.Parse(match.Groups[1].Value.Trim());
-                return;
-            }
-
-            match = Regex.Match(arg, "--use_test_ca=(.*)");
-            if (match.Success)
-            {
-                options.useTestCa = bool.Parse(match.Groups[1].Value.Trim());
-                return;
-            }
-
-            Console.WriteLine(string.Format("Unrecognized argument \"{0}\"", arg));
-            options.help = true;
-        }
     }
 }
diff --git a/src/csharp/Grpc.IntegrationTesting/InteropServer.cs b/src/csharp/Grpc.IntegrationTesting/InteropServer.cs
index 718278f30a..513f8722d6 100644
--- a/src/csharp/Grpc.IntegrationTesting/InteropServer.cs
+++ b/src/csharp/Grpc.IntegrationTesting/InteropServer.cs
@@ -37,6 +37,9 @@ using System.Diagnostics;
 using System.IO;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
+
+using CommandLine;
+using CommandLine.Text;
 using Grpc.Core;
 using Grpc.Core.Utils;
 using Grpc.Testing;
@@ -48,9 +51,24 @@ namespace Grpc.IntegrationTesting
     {
         private class ServerOptions
         {
-            public bool help;
-            public int? port = 8070;
-            public bool useTls;
+            [Option("port", DefaultValue = 8070)]
+            public int Port { get; set; }
+
+            [Option("use_tls")]
+            public bool UseTls { get; set; }
+
+            [HelpOption]
+            public string GetUsage()
+            {
+                var help = new HelpText
+                {
+                    Heading = "gRPC C# interop testing server",
+                    AddDashesToOption = true
+                };
+                help.AddPreOptionsLine("Usage:");
+                help.AddOptions(this);
+                return help;
+            }
         }
 
         ServerOptions options;
@@ -62,22 +80,9 @@ namespace Grpc.IntegrationTesting
 
         public static void Run(string[] args)
         {
-            Console.WriteLine("gRPC C# interop testing server");
-            ServerOptions options = ParseArguments(args);
-
-            if (!options.port.HasValue)
-            {
-                Console.WriteLine("Missing required argument.");
-                Console.WriteLine();
-                options.help = true;
-            }
-
-            if (options.help)
+            var options = new ServerOptions();
+            if (!Parser.Default.ParseArguments(args, options))
             {
-                Console.WriteLine("Usage:");
-                Console.WriteLine("  --port=PORT");
-                Console.WriteLine("  --use_tls=BOOLEAN");
-                Console.WriteLine();
                 Environment.Exit(1);
             }
 
@@ -93,54 +98,19 @@ namespace Grpc.IntegrationTesting
             };
 
             string host = "0.0.0.0";
-            int port = options.port.Value;
-            if (options.useTls)
+            int port = options.Port;
+            if (options.UseTls)
             {
                 server.Ports.Add(host, port, TestCredentials.CreateTestServerCredentials());
             }
             else
             {
-                server.Ports.Add(host, options.port.Value, ServerCredentials.Insecure);
+                server.Ports.Add(host, options.Port, ServerCredentials.Insecure);
             }
             Console.WriteLine("Running server on " + string.Format("{0}:{1}", host, port));
             server.Start();
 
             server.ShutdownTask.Wait();
         }
-
-        private static ServerOptions ParseArguments(string[] args)
-        {
-            var options = new ServerOptions();
-            foreach (string arg in args)
-            {
-                ParseArgument(arg, options);
-                if (options.help)
-                {
-                    break;
-                }
-            }
-            return options;
-        }
-
-        private static void ParseArgument(string arg, ServerOptions options)
-        {
-            Match match;
-            match = Regex.Match(arg, "--port=(.*)");
-            if (match.Success)
-            {
-                options.port = int.Parse(match.Groups[1].Value.Trim());
-                return;
-            }
-
-            match = Regex.Match(arg, "--use_tls=(.*)");
-            if (match.Success)
-            {
-                options.useTls = bool.Parse(match.Groups[1].Value.Trim());
-                return;
-            }
-
-            Console.WriteLine(string.Format("Unrecognized argument \"{0}\"", arg));
-            options.help = true;
-        }
     }
 }
diff --git a/src/csharp/Grpc.IntegrationTesting/packages.config b/src/csharp/Grpc.IntegrationTesting/packages.config
index 8dfded1964..bdb3dadf44 100644
--- a/src/csharp/Grpc.IntegrationTesting/packages.config
+++ b/src/csharp/Grpc.IntegrationTesting/packages.config
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="BouncyCastle" version="1.7.0" targetFramework="net45" />
+  <package id="CommandLineParser" version="1.9.71" targetFramework="net45" />
   <package id="Google.Apis.Auth" version="1.9.3" targetFramework="net45" />
   <package id="Google.Apis.Core" version="1.9.3" targetFramework="net45" />
   <package id="Google.Protobuf" version="3.0.0-alpha4" targetFramework="net45" />
diff --git a/src/node/README.md b/src/node/README.md
index 0b97680feb..7719d08290 100644
--- a/src/node/README.md
+++ b/src/node/README.md
@@ -11,10 +11,10 @@ Beta
 
 **Linux (Debian):**
 
-Add [Debian testing][] to your `sources.list` file. Example:
+Add [Debian jessie-backports][] to your `sources.list` file. Example:
 
 ```sh
-echo "deb http://ftp.us.debian.org/debian testing main contrib non-free" | \
+echo "deb http://http.debian.net/debian jessie-backports main" | \
 sudo tee -a /etc/apt/sources.list
 ```
 
@@ -113,4 +113,4 @@ An object with factory methods for creating credential objects for servers.
 
 [homebrew]:http://brew.sh
 [gRPC install script]:https://raw.githubusercontent.com/grpc/homebrew-grpc/master/scripts/install
-[Debian testing]:https://www.debian.org/releases/stretch/
+[Debian jessie-backports]:http://backports.debian.org/Instructions/
diff --git a/src/php/README.md b/src/php/README.md
index afa09d79a1..51322c7526 100644
--- a/src/php/README.md
+++ b/src/php/README.md
@@ -32,10 +32,10 @@ $ sudo php -d detect_unicode=0 go-pear.phar
 
 **Linux (Debian):**
 
-Add [Debian testing][] to your `sources.list` file. Example:
+Add [Debian jessie-backports][] to your `sources.list` file. Example:
 
 ```sh
-echo "deb http://ftp.us.debian.org/debian testing main contrib non-free" | \
+echo "deb http://http.debian.net/debian jessie-backports main" | \
 sudo tee -a /etc/apt/sources.list
 ```
 
@@ -167,4 +167,4 @@ $ ./bin/run_gen_code_test.sh
 [homebrew]:http://brew.sh
 [gRPC install script]:https://raw.githubusercontent.com/grpc/homebrew-grpc/master/scripts/install
 [Node]:https://github.com/grpc/grpc/tree/master/src/node/examples
-[Debian testing]:https://www.debian.org/releases/stretch/
+[Debian jessie-backports]:http://backports.debian.org/Instructions/
diff --git a/src/python/README.md b/src/python/README.md
index 67d1a173a2..afe7c731f1 100644
--- a/src/python/README.md
+++ b/src/python/README.md
@@ -16,10 +16,10 @@ INSTALLATION
 
 **Linux (Debian):**
 
-Add [Debian testing][] to your `sources.list` file. Example:
+Add [Debian jessie-backports][] to your `sources.list` file. Example:
 
 ```sh
-echo "deb http://ftp.us.debian.org/debian testing main contrib non-free" | \
+echo "deb http://http.debian.net/debian jessie-backports main" | \
 sudo tee -a /etc/apt/sources.list
 ```
 
@@ -92,4 +92,4 @@ $ ../../tools/distrib/python/submit.py
 [gRPC install script]:https://raw.githubusercontent.com/grpc/homebrew-grpc/master/scripts/install
 [Quick Start]:http://www.grpc.io/docs/tutorials/basic/python.html
 [detailed example]:http://www.grpc.io/docs/installation/python.html
-[Debian testing]:https://www.debian.org/releases/stretch/
+[Debian jessie-backports]:http://backports.debian.org/Instructions/
diff --git a/src/python/grpcio/commands.py b/src/python/grpcio/commands.py
index 89c0fbf0f3..8a2f2d6283 100644
--- a/src/python/grpcio/commands.py
+++ b/src/python/grpcio/commands.py
@@ -64,7 +64,7 @@ class SphinxDocumentation(setuptools.Command):
     import sphinx.apidoc
     metadata = self.distribution.metadata
     src_dir = os.path.join(
-        os.getcwd(), self.distribution.package_dir['grpc'])
+        os.getcwd(), self.distribution.package_dir[''], 'grpc')
     sys.path.append(src_dir)
     sphinx.apidoc.main([
         '', '--force', '--full', '-H', metadata.name, '-A', metadata.author,
diff --git a/src/python/grpcio/grpc/_adapter/_intermediary_low.py b/src/python/grpcio/grpc/_adapter/_intermediary_low.py
index 735ad205a4..e2feec6ffb 100644
--- a/src/python/grpcio/grpc/_adapter/_intermediary_low.py
+++ b/src/python/grpcio/grpc/_adapter/_intermediary_low.py
@@ -59,6 +59,7 @@ from grpc._adapter import _types
 
 _IGNORE_ME_TAG = object()
 Code = _types.StatusCode
+WriteFlags = _types.OpWriteFlags
 
 
 class Status(collections.namedtuple('Status', ['code', 'details'])):
@@ -125,9 +126,9 @@ class Call(object):
       ], _TagAdapter(finish_tag, Event.Kind.FINISH))
     return err0 if err0 != _types.CallError.OK else err1 if err1 != _types.CallError.OK else err2 if err2 != _types.CallError.OK else _types.CallError.OK
 
-  def write(self, message, tag):
+  def write(self, message, tag, flags):
     return self._internal.start_batch([
-          _types.OpArgs.send_message(message, 0)
+          _types.OpArgs.send_message(message, flags)
       ], _TagAdapter(tag, Event.Kind.WRITE_ACCEPTED))
 
   def complete(self, tag):
@@ -163,8 +164,11 @@ class Call(object):
   def cancel(self):
     return self._internal.cancel()
 
+  def peer(self):
+    return self._internal.peer()
+
   def set_credentials(self, creds):
-    return self._internal.set_credentials(creds)
+    return self._internal.set_credentials(creds._internal)
 
 
 class Channel(object):
diff --git a/src/python/grpcio/grpc/_adapter/fore.py b/src/python/grpcio/grpc/_adapter/fore.py
index daa41e8bde..acdd69c420 100644
--- a/src/python/grpcio/grpc/_adapter/fore.py
+++ b/src/python/grpcio/grpc/_adapter/fore.py
@@ -56,7 +56,7 @@ class _LowWrite(enum.Enum):
 def _write(call, rpc_state, payload):
   serialized_payload = rpc_state.serializer(payload)
   if rpc_state.write.low is _LowWrite.OPEN:
-    call.write(serialized_payload, call)
+    call.write(serialized_payload, call, 0)
     rpc_state.write.low = _LowWrite.ACTIVE
   else:
     rpc_state.write.pending.append(serialized_payload)
@@ -164,7 +164,7 @@ class ForeLink(base_interfaces.ForeLink, activated.Activated):
 
     if rpc_state.write.pending:
       serialized_payload = rpc_state.write.pending.pop(0)
-      call.write(serialized_payload, call)
+      call.write(serialized_payload, call, 0)
     elif rpc_state.write.high is _common.HighWrite.CLOSED:
       _status(call, rpc_state)
     else:
diff --git a/src/python/grpcio/grpc/_adapter/rear.py b/src/python/grpcio/grpc/_adapter/rear.py
index fd6f45f7a7..17fa47f746 100644
--- a/src/python/grpcio/grpc/_adapter/rear.py
+++ b/src/python/grpcio/grpc/_adapter/rear.py
@@ -78,7 +78,7 @@ class _RPCState(object):
 
 def _write(operation_id, call, outstanding, write_state, serialized_payload):
   if write_state.low is _LowWrite.OPEN:
-    call.write(serialized_payload, operation_id)
+    call.write(serialized_payload, operation_id, 0)
     outstanding.add(_low.Event.Kind.WRITE_ACCEPTED)
     write_state.low = _LowWrite.ACTIVE
   elif write_state.low is _LowWrite.ACTIVE:
@@ -144,7 +144,7 @@ class RearLink(base_interfaces.RearLink, activated.Activated):
     if event.write_accepted:
       if rpc_state.common.write.pending:
         rpc_state.call.write(
-            rpc_state.common.write.pending.pop(0), operation_id)
+            rpc_state.common.write.pending.pop(0), operation_id, 0)
         rpc_state.outstanding.add(_low.Event.Kind.WRITE_ACCEPTED)
       elif rpc_state.common.write.high is _common.HighWrite.CLOSED:
         rpc_state.call.complete(operation_id)
@@ -263,7 +263,7 @@ class RearLink(base_interfaces.RearLink, activated.Activated):
         low_state = _LowWrite.OPEN
     else:
       serialized_payload = request_serializer(payload)
-      call.write(serialized_payload, operation_id)
+      call.write(serialized_payload, operation_id, 0)
       outstanding.add(_low.Event.Kind.WRITE_ACCEPTED)
       low_state = _LowWrite.ACTIVE
 
diff --git a/src/python/grpcio/grpc/_links/invocation.py b/src/python/grpcio/grpc/_links/invocation.py
index fecb550ae0..67ef86a176 100644
--- a/src/python/grpcio/grpc/_links/invocation.py
+++ b/src/python/grpcio/grpc/_links/invocation.py
@@ -37,6 +37,7 @@ import time
 
 from grpc._adapter import _intermediary_low
 from grpc._links import _constants
+from grpc.beta import interfaces as beta_interfaces
 from grpc.framework.foundation import activated
 from grpc.framework.foundation import logging_pool
 from grpc.framework.foundation import relay
@@ -73,11 +74,28 @@ class _LowWrite(enum.Enum):
   CLOSED = 'CLOSED'
 
 
+class _Context(beta_interfaces.GRPCInvocationContext):
+
+  def __init__(self):
+    self._lock = threading.Lock()
+    self._disable_next_compression = False
+
+  def disable_next_request_compression(self):
+    with self._lock:
+      self._disable_next_compression = True
+
+  def next_compression_disabled(self):
+    with self._lock:
+      disabled = self._disable_next_compression
+      self._disable_next_compression = False
+      return disabled
+
+
 class _RPCState(object):
 
   def __init__(
       self, call, request_serializer, response_deserializer, sequence_number,
-      read, allowance, high_write, low_write, due):
+      read, allowance, high_write, low_write, due, context):
     self.call = call
     self.request_serializer = request_serializer
     self.response_deserializer = response_deserializer
@@ -87,6 +105,7 @@ class _RPCState(object):
     self.high_write = high_write
     self.low_write = low_write
     self.due = due
+    self.context = context
 
 
 def _no_longer_due(kind, rpc_state, key, rpc_states):
@@ -209,7 +228,7 @@ class _Kernel(object):
 
   def _invoke(
       self, operation_id, group, method, initial_metadata, payload, termination,
-      timeout, allowance):
+      timeout, allowance, options):
     """Invoke an RPC.
 
     Args:
@@ -224,6 +243,7 @@ class _Kernel(object):
       timeout: A duration of time in seconds to allow for the RPC.
       allowance: The number of payloads (beyond the free first one) that the
         local ticket exchange mate has granted permission to be read.
+      options: A beta_interfaces.GRPCCallOptions value or None.
     """
     if termination is links.Ticket.Termination.COMPLETION:
       high_write = _HighWrite.CLOSED
@@ -241,6 +261,8 @@ class _Kernel(object):
     call = _intermediary_low.Call(
         self._channel, self._completion_queue, '/%s/%s' % (group, method),
         self._host, time.time() + timeout)
+    if options is not None and options.credentials is not None:
+      call.set_credentials(options.credentials._intermediary_low_credentials)
     if transformed_initial_metadata is not None:
       for metadata_key, metadata_value in transformed_initial_metadata:
         call.add_metadata(metadata_key, metadata_value)
@@ -254,17 +276,33 @@ class _Kernel(object):
         low_write = _LowWrite.OPEN
         due = set((_METADATA, _FINISH,))
     else:
-      call.write(request_serializer(payload), operation_id)
+      if options is not None and options.disable_compression:
+        flags = _intermediary_low.WriteFlags.WRITE_NO_COMPRESS
+      else:
+        flags = 0
+      call.write(request_serializer(payload), operation_id, flags)
       low_write = _LowWrite.ACTIVE
       due = set((_WRITE, _METADATA, _FINISH,))
+    context = _Context()
     self._rpc_states[operation_id] = _RPCState(
-        call, request_serializer, response_deserializer, 0,
+        call, request_serializer, response_deserializer, 1,
         _Read.AWAITING_METADATA, 1 if allowance is None else (1 + allowance),
-        high_write, low_write, due)
+        high_write, low_write, due, context)
+    protocol = links.Protocol(links.Protocol.Kind.INVOCATION_CONTEXT, context)
+    ticket = links.Ticket(
+        operation_id, 0, None, None, None, None, None, None, None, None, None,
+        None, None, protocol)
+    self._relay.add_value(ticket)
 
   def _advance(self, operation_id, rpc_state, payload, termination, allowance):
     if payload is not None:
-      rpc_state.call.write(rpc_state.request_serializer(payload), operation_id)
+      disable_compression = rpc_state.context.next_compression_disabled()
+      if disable_compression:
+        flags = _intermediary_low.WriteFlags.WRITE_NO_COMPRESS
+      else:
+        flags = 0
+      rpc_state.call.write(
+          rpc_state.request_serializer(payload), operation_id, flags)
       rpc_state.low_write = _LowWrite.ACTIVE
       rpc_state.due.add(_WRITE)
 
@@ -292,10 +330,15 @@ class _Kernel(object):
         if self._completion_queue is None:
           logging.error('Received invocation ticket %s after stop!', ticket)
         else:
+          if (ticket.protocol is not None and
+              ticket.protocol.kind is links.Protocol.Kind.CALL_OPTION):
+            grpc_call_options = ticket.protocol.value
+          else:
+            grpc_call_options = None
           self._invoke(
               ticket.operation_id, ticket.group, ticket.method,
               ticket.initial_metadata, ticket.payload, ticket.termination,
-              ticket.timeout, ticket.allowance)
+              ticket.timeout, ticket.allowance, grpc_call_options)
       else:
         rpc_state = self._rpc_states.get(ticket.operation_id)
         if rpc_state is not None:
diff --git a/src/python/grpcio/grpc/_links/service.py b/src/python/grpcio/grpc/_links/service.py
index 34d3b262c9..f56df84007 100644
--- a/src/python/grpcio/grpc/_links/service.py
+++ b/src/python/grpcio/grpc/_links/service.py
@@ -37,6 +37,7 @@ import time
 
 from grpc._adapter import _intermediary_low
 from grpc._links import _constants
+from grpc.beta import interfaces as beta_interfaces
 from grpc.framework.foundation import logging_pool
 from grpc.framework.foundation import relay
 from grpc.framework.interfaces.links import links
@@ -89,12 +90,34 @@ class _LowWrite(enum.Enum):
   CLOSED = 'CLOSED'
 
 
+class _Context(beta_interfaces.GRPCServicerContext):
+
+  def __init__(self, call):
+    self._lock = threading.Lock()
+    self._call = call
+    self._disable_next_compression = False
+
+  def peer(self):
+    with self._lock:
+      return self._call.peer()
+
+  def disable_next_response_compression(self):
+    with self._lock:
+      self._disable_next_compression = True
+
+  def next_compression_disabled(self):
+    with self._lock:
+      disabled = self._disable_next_compression
+      self._disable_next_compression = False
+      return disabled
+
+
 class _RPCState(object):
 
   def __init__(
       self, request_deserializer, response_serializer, sequence_number, read,
       early_read, allowance, high_write, low_write, premetadataed,
-      terminal_metadata, code, message, due):
+      terminal_metadata, code, message, due, context):
     self.request_deserializer = request_deserializer
     self.response_serializer = response_serializer
     self.sequence_number = sequence_number
@@ -110,6 +133,7 @@ class _RPCState(object):
     self.code = code
     self.message = message
     self.due = due
+    self.context = context
 
 
 def _no_longer_due(kind, rpc_state, key, rpc_states):
@@ -163,14 +187,16 @@ class _Kernel(object):
         (group, method), _IDENTITY)
 
     call.read(call)
+    context = _Context(call)
     self._rpc_states[call] = _RPCState(
         request_deserializer, response_serializer, 1, _Read.READING, None, 1,
         _HighWrite.OPEN, _LowWrite.OPEN, False, None, None, None,
-        set((_READ, _FINISH,)))
+        set((_READ, _FINISH,)), context)
+    protocol = links.Protocol(links.Protocol.Kind.SERVICER_CONTEXT, context)
     ticket = links.Ticket(
         call, 0, group, method, links.Ticket.Subscription.FULL,
         service_acceptance.deadline - time.time(), None, event.metadata, None,
-        None, None, None, None, 'TODO: Service Context Object!')
+        None, None, None, None, protocol)
     self._relay.add_value(ticket)
 
   def _on_read_event(self, event):
@@ -311,7 +337,12 @@ class _Kernel(object):
           self._relay.add_value(early_read_ticket)
 
       if ticket.payload is not None:
-        call.write(rpc_state.response_serializer(ticket.payload), call)
+        disable_compression = rpc_state.context.next_compression_disabled()
+        if disable_compression:
+          flags = _intermediary_low.WriteFlags.WRITE_NO_COMPRESS
+        else:
+          flags = 0
+        call.write(rpc_state.response_serializer(ticket.payload), call, flags)
         rpc_state.due.add(_WRITE)
         rpc_state.low_write = _LowWrite.ACTIVE
 
diff --git a/src/python/grpcio/grpc/beta/_connectivity_channel.py b/src/python/grpcio/grpc/beta/_connectivity_channel.py
index 457ede79f2..61674a70ad 100644
--- a/src/python/grpcio/grpc/beta/_connectivity_channel.py
+++ b/src/python/grpcio/grpc/beta/_connectivity_channel.py
@@ -33,18 +33,24 @@ import threading
 import time
 
 from grpc._adapter import _low
+from grpc._adapter import _types
+from grpc.beta import interfaces
 from grpc.framework.foundation import callable_util
 
 _CHANNEL_SUBSCRIPTION_CALLBACK_ERROR_LOG_MESSAGE = (
     'Exception calling channel subscription callback!')
 
+_LOW_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY = {
+    state: connectivity for state, connectivity in zip(
+        _types.ConnectivityState, interfaces.ChannelConnectivity)
+}
+
 
 class ConnectivityChannel(object):
 
-  def __init__(self, low_channel, mapping):
+  def __init__(self, low_channel):
     self._lock = threading.Lock()
     self._low_channel = low_channel
-    self._mapping = mapping
 
     self._polling = False
     self._connectivity = None
@@ -88,7 +94,8 @@ class ConnectivityChannel(object):
     try_to_connect = initial_try_to_connect
     low_connectivity = low_channel.check_connectivity_state(try_to_connect)
     with self._lock:
-      self._connectivity = self._mapping[low_connectivity]
+      self._connectivity = _LOW_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY[
+          low_connectivity]
       callbacks = tuple(
           callback for callback, unused_but_known_to_be_none_connectivity
           in self._callbacks_and_connectivities)
@@ -112,7 +119,8 @@ class ConnectivityChannel(object):
       if event.success or try_to_connect:
         low_connectivity = low_channel.check_connectivity_state(try_to_connect)
         with self._lock:
-          self._connectivity = self._mapping[low_connectivity]
+          self._connectivity = _LOW_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY[
+              low_connectivity]
           if not self._delivering:
             callbacks = self._deliveries(self._connectivity)
             if callbacks:
diff --git a/src/python/grpcio/grpc/beta/_server.py b/src/python/grpcio/grpc/beta/_server.py
index ebf91d80ab..05b954d186 100644
--- a/src/python/grpcio/grpc/beta/_server.py
+++ b/src/python/grpcio/grpc/beta/_server.py
@@ -72,7 +72,7 @@ def _disassemble(grpc_link, end_link, pool, event, grace):
   event.set()
 
 
-class Server(object):
+class Server(interfaces.Server):
 
   def __init__(self, grpc_link, end_link, pool):
     self._grpc_link = grpc_link
@@ -82,17 +82,17 @@ class Server(object):
   def add_insecure_port(self, address):
     return self._grpc_link.add_port(address, None)
 
-  def add_secure_port(self, address, intermediary_low_server_credentials):
+  def add_secure_port(self, address, server_credentials):
     return self._grpc_link.add_port(
-        address, intermediary_low_server_credentials)
+        address, server_credentials._intermediary_low_credentials)  # pylint: disable=protected-access
 
-  def start(self):
+  def _start(self):
     self._grpc_link.join_link(self._end_link)
     self._end_link.join_link(self._grpc_link)
     self._grpc_link.start()
     self._end_link.start()
 
-  def stop(self, grace):
+  def _stop(self, grace):
     stop_event = threading.Event()
     if 0 < grace:
       disassembly_thread = threading.Thread(
@@ -105,6 +105,20 @@ class Server(object):
       _disassemble(self._grpc_link, self._end_link, self._pool, stop_event, 0)
       return stop_event
 
+  def start(self):
+    self._start()
+
+  def stop(self, grace):
+    return self._stop(grace)
+
+  def __enter__(self):
+    self._start()
+    return self
+
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    self._stop(0).wait()
+    return False
+
 
 def server(
     implementations, multi_implementation, request_deserializers,
diff --git a/src/python/grpcio/grpc/beta/_stub.py b/src/python/grpcio/grpc/beta/_stub.py
index cfbecb852b..11dab889cd 100644
--- a/src/python/grpcio/grpc/beta/_stub.py
+++ b/src/python/grpcio/grpc/beta/_stub.py
@@ -49,6 +49,12 @@ class _AutoIntermediary(object):
   def __getattr__(self, attr):
     return getattr(self._delegate, attr)
 
+  def __enter__(self):
+    return self
+
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    return False
+
   def __del__(self):
     self._on_deletion()
 
diff --git a/src/python/grpcio/grpc/beta/beta.py b/src/python/grpcio/grpc/beta/implementations.py
index b3a161087f..9b461fb3dd 100644
--- a/src/python/grpcio/grpc/beta/beta.py
+++ b/src/python/grpcio/grpc/beta/implementations.py
@@ -40,6 +40,7 @@ from grpc._adapter import _types
 from grpc.beta import _connectivity_channel
 from grpc.beta import _server
 from grpc.beta import _stub
+from grpc.beta import interfaces
 from grpc.framework.common import cardinality  # pylint: disable=unused-import
 from grpc.framework.interfaces.face import face  # pylint: disable=unused-import
 
@@ -47,32 +48,6 @@ _CHANNEL_SUBSCRIPTION_CALLBACK_ERROR_LOG_MESSAGE = (
     'Exception calling channel subscription callback!')
 
 
-@enum.unique
-class ChannelConnectivity(enum.Enum):
-  """Mirrors grpc_connectivity_state in the gRPC Core.
-
-  Attributes:
-    IDLE: The channel is idle.
-    CONNECTING: The channel is connecting.
-    READY: The channel is ready to conduct RPCs.
-    TRANSIENT_FAILURE: The channel has seen a failure from which it expects to
-      recover.
-    FATAL_FAILURE: The channel has seen a failure from which it cannot recover.
-  """
-
-  IDLE = (_types.ConnectivityState.IDLE, 'idle',)
-  CONNECTING = (_types.ConnectivityState.CONNECTING, 'connecting',)
-  READY = (_types.ConnectivityState.READY, 'ready',)
-  TRANSIENT_FAILURE = (
-      _types.ConnectivityState.TRANSIENT_FAILURE, 'transient failure',)
-  FATAL_FAILURE = (_types.ConnectivityState.FATAL_FAILURE, 'fatal failure',)
-
-_LOW_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY = {
-    state: connectivity for state, connectivity in zip(
-        _types.ConnectivityState, ChannelConnectivity)
-}
-
-
 class ClientCredentials(object):
   """A value encapsulating the data required to create a secure Channel.
 
@@ -118,13 +93,14 @@ class Channel(object):
     self._low_channel = low_channel
     self._intermediary_low_channel = intermediary_low_channel
     self._connectivity_channel = _connectivity_channel.ConnectivityChannel(
-        low_channel, _LOW_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY)
+        low_channel)
 
   def subscribe(self, callback, try_to_connect=None):
     """Subscribes to this Channel's connectivity.
 
     Args:
-      callback: A callable to be invoked and passed this Channel's connectivity.
+      callback: A callable to be invoked and passed an
+        interfaces.ChannelConnectivity identifying this Channel's connectivity.
         The callable will be invoked immediately upon subscription and again for
         every change to this Channel's connectivity thereafter until it is
         unsubscribed.
@@ -144,7 +120,7 @@ class Channel(object):
     self._connectivity_channel.unsubscribe(callback)
 
 
-def create_insecure_channel(host, port):
+def insecure_channel(host, port):
   """Creates an insecure Channel to a remote host.
 
   Args:
@@ -159,7 +135,7 @@ def create_insecure_channel(host, port):
   return Channel(intermediary_low_channel._internal, intermediary_low_channel)  # pylint: disable=protected-access
 
 
-def create_secure_channel(host, port, client_credentials):
+def secure_channel(host, port, client_credentials):
   """Creates a secure Channel to a remote host.
 
   Args:
@@ -313,86 +289,6 @@ def ssl_server_credentials(
         intermediary_low_credentials._internal, intermediary_low_credentials)  # pylint: disable=protected-access
 
 
-class Server(object):
-  """Services RPCs."""
-  __metaclass__ = abc.ABCMeta
-
-  @abc.abstractmethod
-  def add_insecure_port(self, address):
-    """Reserves a port for insecure RPC service once this Server becomes active.
-
-    This method may only be called before calling this Server's start method is
-    called.
-
-    Args:
-      address: The address for which to open a port.
-
-    Returns:
-      An integer port on which RPCs will be serviced after this link has been
-        started. This is typically the same number as the port number contained
-        in the passed address, but will likely be different if the port number
-        contained in the passed address was zero.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def add_secure_port(self, address, server_credentials):
-    """Reserves a port for secure RPC service after this Server becomes active.
-
-    This method may only be called before calling this Server's start method is
-    called.
-
-    Args:
-      address: The address for which to open a port.
-      server_credentials: A ServerCredentials.
-
-    Returns:
-      An integer port on which RPCs will be serviced after this link has been
-        started. This is typically the same number as the port number contained
-        in the passed address, but will likely be different if the port number
-        contained in the passed address was zero.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def start(self):
-    """Starts this Server's service of RPCs.
-
-    This method may only be called while the server is not serving RPCs (i.e. it
-    is not idempotent).
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def stop(self, grace):
-    """Stops this Server's service of RPCs.
-
-    All calls to this method immediately stop service of new RPCs. When existing
-    RPCs are aborted is controlled by the grace period parameter passed to this
-    method.
-
-    This method may be called at any time and is idempotent. Passing a smaller
-    grace value than has been passed in a previous call will have the effect of
-    stopping the Server sooner. Passing a larger grace value than has been
-    passed in a previous call will not have the effect of stopping the sooner
-    later.
-
-    Args:
-      grace: A duration of time in seconds to allow existing RPCs to complete
-        before being aborted by this Server's stopping. May be zero for
-        immediate abortion of all in-progress RPCs.
-
-    Returns:
-      A threading.Event that will be set when this Server has completely
-      stopped. The returned event may not be set until after the full grace
-      period (if some ongoing RPC continues for the full length of the period)
-      of it may be set much sooner (such as if this Server had no RPCs underway
-      at the time it was stopped or if all RPCs that it had underway completed
-      very early in the grace period).
-    """
-    raise NotImplementedError()
-
-
 class ServerOptions(object):
   """A value encapsulating the various options for creation of a Server.
 
@@ -450,27 +346,8 @@ def server_options(
       thread_pool, thread_pool_size, default_timeout, maximum_timeout)
 
 
-class _Server(Server):
-
-  def __init__(self, underserver):
-    self._underserver = underserver
-
-  def add_insecure_port(self, address):
-    return self._underserver.add_insecure_port(address)
-
-  def add_secure_port(self, address, server_credentials):
-    return self._underserver.add_secure_port(
-        address, server_credentials._intermediary_low_credentials)  # pylint: disable=protected-access
-
-  def start(self):
-    self._underserver.start()
-
-  def stop(self, grace):
-    return self._underserver.stop(grace)
-
-
 def server(service_implementations, options=None):
-  """Creates a Server with which RPCs can be serviced.
+  """Creates an interfaces.Server with which RPCs can be serviced.
 
   Args:
     service_implementations: A dictionary from service name-method name pair to
@@ -479,13 +356,12 @@ def server(service_implementations, options=None):
       functionality of the returned Server.
 
   Returns:
-    A Server with which RPCs can be serviced.
+    An interfaces.Server with which RPCs can be serviced.
   """
   effective_options = _EMPTY_SERVER_OPTIONS if options is None else options
-  underserver = _server.server(
+  return _server.server(
       service_implementations, effective_options.multi_method_implementation,
       effective_options.request_deserializers,
       effective_options.response_serializers, effective_options.thread_pool,
       effective_options.thread_pool_size, effective_options.default_timeout,
       effective_options.maximum_timeout)
-  return _Server(underserver)
diff --git a/src/python/grpcio/grpc/beta/interfaces.py b/src/python/grpcio/grpc/beta/interfaces.py
index 25e6a9c66b..07c8618f70 100644
--- a/src/python/grpcio/grpc/beta/interfaces.py
+++ b/src/python/grpcio/grpc/beta/interfaces.py
@@ -29,8 +29,31 @@
 
 """Constants and interfaces of the Beta API of gRPC Python."""
 
+import abc
 import enum
 
+from grpc._adapter import _types
+
+
+@enum.unique
+class ChannelConnectivity(enum.Enum):
+  """Mirrors grpc_connectivity_state in the gRPC Core.
+
+  Attributes:
+    IDLE: The channel is idle.
+    CONNECTING: The channel is connecting.
+    READY: The channel is ready to conduct RPCs.
+    TRANSIENT_FAILURE: The channel has seen a failure from which it expects to
+      recover.
+    FATAL_FAILURE: The channel has seen a failure from which it cannot recover.
+  """
+  IDLE = (_types.ConnectivityState.IDLE, 'idle',)
+  CONNECTING = (_types.ConnectivityState.CONNECTING, 'connecting',)
+  READY = (_types.ConnectivityState.READY, 'ready',)
+  TRANSIENT_FAILURE = (
+      _types.ConnectivityState.TRANSIENT_FAILURE, 'transient failure',)
+  FATAL_FAILURE = (_types.ConnectivityState.FATAL_FAILURE, 'fatal failure',)
+
 
 @enum.unique
 class StatusCode(enum.Enum):
@@ -52,3 +75,140 @@ class StatusCode(enum.Enum):
   UNAVAILABLE         = 14
   DATA_LOSS           = 15
   UNAUTHENTICATED     = 16
+
+
+class GRPCCallOptions(object):
+  """A value encapsulating gRPC-specific options passed on RPC invocation.
+
+  This class and its instances have no supported interface - it exists to
+  define the type of its instances and its instances exist to be passed to
+  other functions.
+  """
+
+  def __init__(self, disable_compression, subcall_of, credentials):
+    self.disable_compression = disable_compression
+    self.subcall_of = subcall_of
+    self.credentials = credentials
+
+
+def grpc_call_options(disable_compression=False, credentials=None):
+  """Creates a GRPCCallOptions value to be passed at RPC invocation.
+
+  All parameters are optional and should always be passed by keyword.
+
+  Args:
+    disable_compression: A boolean indicating whether or not compression should
+      be disabled for the request object of the RPC. Only valid for
+      request-unary RPCs.
+    credentials: A ClientCredentials object to use for the invoked RPC.
+  """
+  return GRPCCallOptions(disable_compression, None, credentials)
+
+
+class GRPCServicerContext(object):
+  """Exposes gRPC-specific options and behaviors to code servicing RPCs."""
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def peer(self):
+    """Identifies the peer that invoked the RPC being serviced.
+
+    Returns:
+      A string identifying the peer that invoked the RPC being serviced.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def disable_next_response_compression(self):
+    """Disables compression of the next response passed by the application."""
+    raise NotImplementedError()
+
+
+class GRPCInvocationContext(object):
+  """Exposes gRPC-specific options and behaviors to code invoking RPCs."""
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def disable_next_request_compression(self):
+    """Disables compression of the next request passed by the application."""
+    raise NotImplementedError()
+
+
+class Server(object):
+  """Services RPCs."""
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def add_insecure_port(self, address):
+    """Reserves a port for insecure RPC service once this Server becomes active.
+
+    This method may only be called before calling this Server's start method is
+    called.
+
+    Args:
+      address: The address for which to open a port.
+
+    Returns:
+      An integer port on which RPCs will be serviced after this link has been
+        started. This is typically the same number as the port number contained
+        in the passed address, but will likely be different if the port number
+        contained in the passed address was zero.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def add_secure_port(self, address, server_credentials):
+    """Reserves a port for secure RPC service after this Server becomes active.
+
+    This method may only be called before calling this Server's start method is
+    called.
+
+    Args:
+      address: The address for which to open a port.
+      server_credentials: A ServerCredentials.
+
+    Returns:
+      An integer port on which RPCs will be serviced after this link has been
+        started. This is typically the same number as the port number contained
+        in the passed address, but will likely be different if the port number
+        contained in the passed address was zero.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def start(self):
+    """Starts this Server's service of RPCs.
+
+    This method may only be called while the server is not serving RPCs (i.e. it
+    is not idempotent).
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def stop(self, grace):
+    """Stops this Server's service of RPCs.
+
+    All calls to this method immediately stop service of new RPCs. When existing
+    RPCs are aborted is controlled by the grace period parameter passed to this
+    method.
+
+    This method may be called at any time and is idempotent. Passing a smaller
+    grace value than has been passed in a previous call will have the effect of
+    stopping the Server sooner. Passing a larger grace value than has been
+    passed in a previous call will not have the effect of stopping the sooner
+    later.
+
+    Args:
+      grace: A duration of time in seconds to allow existing RPCs to complete
+        before being aborted by this Server's stopping. May be zero for
+        immediate abortion of all in-progress RPCs.
+
+    Returns:
+      A threading.Event that will be set when this Server has completely
+      stopped. The returned event may not be set until after the full grace
+      period (if some ongoing RPC continues for the full length of the period)
+      of it may be set much sooner (such as if this Server had no RPCs underway
+      at the time it was stopped or if all RPCs that it had underway completed
+      very early in the grace period).
+    """
+    raise NotImplementedError()
diff --git a/src/python/grpcio/grpc/beta/utilities.py b/src/python/grpcio/grpc/beta/utilities.py
index 1b5356e3ad..fb07a76579 100644
--- a/src/python/grpcio/grpc/beta/utilities.py
+++ b/src/python/grpcio/grpc/beta/utilities.py
@@ -32,7 +32,9 @@
 import threading
 import time
 
-from grpc.beta import beta
+# implementations is referenced from specification in this module.
+from grpc.beta import implementations  # pylint: disable=unused-import
+from grpc.beta import interfaces
 from grpc.framework.foundation import callable_util
 from grpc.framework.foundation import future
 
@@ -70,7 +72,8 @@ class _ChannelReadyFuture(future.Future):
 
   def _update(self, connectivity):
     with self._condition:
-      if not self._cancelled and connectivity is beta.ChannelConnectivity.READY:
+      if (not self._cancelled and
+          connectivity is interfaces.ChannelConnectivity.READY):
         self._matured = True
         self._channel.unsubscribe(self._update)
         self._condition.notify_all()
@@ -141,19 +144,19 @@ class _ChannelReadyFuture(future.Future):
 
 
 def channel_ready_future(channel):
-  """Creates a future.Future that matures when a beta.Channel is ready.
+  """Creates a future.Future tracking when an implementations.Channel is ready.
 
-  Cancelling the returned future.Future does not tell the given beta.Channel to
-  abandon attempts it may have been making to connect; cancelling merely
-  deactivates the return future.Future's subscription to the given
-  beta.Channel's connectivity.
+  Cancelling the returned future.Future does not tell the given
+  implementations.Channel to abandon attempts it may have been making to
+  connect; cancelling merely deactivates the return future.Future's
+  subscription to the given implementations.Channel's connectivity.
 
   Args:
-    channel: A beta.Channel.
+    channel: An implementations.Channel.
 
   Returns:
     A future.Future that matures when the given Channel has connectivity
-      beta.ChannelConnectivity.READY.
+      interfaces.ChannelConnectivity.READY.
   """
   ready_future = _ChannelReadyFuture(channel)
   ready_future.start()
diff --git a/src/python/grpcio/grpc/framework/core/_end.py b/src/python/grpcio/grpc/framework/core/_end.py
index 336e9c21fd..8e07d9061e 100644
--- a/src/python/grpcio/grpc/framework/core/_end.py
+++ b/src/python/grpcio/grpc/framework/core/_end.py
@@ -168,7 +168,7 @@ class _End(End):
 
   def operate(
       self, group, method, subscription, timeout, initial_metadata=None,
-      payload=None, completion=None):
+      payload=None, completion=None, protocol_options=None):
     """See base.End.operate for specification."""
     operation_id = uuid.uuid4()
     with self._lock:
@@ -177,9 +177,9 @@ class _End(End):
       termination_action = _termination_action(
           self._lock, self._stats, operation_id, self._cycle)
       operation = _operation.invocation_operate(
-          operation_id, group, method, subscription, timeout, initial_metadata,
-          payload, completion, self._mate.accept_ticket, termination_action,
-          self._cycle.pool)
+          operation_id, group, method, subscription, timeout, protocol_options,
+          initial_metadata, payload, completion, self._mate.accept_ticket,
+          termination_action, self._cycle.pool)
       self._cycle.operations[operation_id] = operation
       return operation.context, operation.operator
 
diff --git a/src/python/grpcio/grpc/framework/core/_ingestion.py b/src/python/grpcio/grpc/framework/core/_ingestion.py
index 9a7959a2dd..4129a8ce43 100644
--- a/src/python/grpcio/grpc/framework/core/_ingestion.py
+++ b/src/python/grpcio/grpc/framework/core/_ingestion.py
@@ -140,7 +140,7 @@ class _IngestionManager(_interfaces.IngestionManager):
 
   def __init__(
       self, lock, pool, subscription, subscription_creator, termination_manager,
-      transmission_manager, expiration_manager):
+      transmission_manager, expiration_manager, protocol_manager):
     """Constructor.
 
     Args:
@@ -157,12 +157,14 @@ class _IngestionManager(_interfaces.IngestionManager):
       transmission_manager: The _interfaces.TransmissionManager for the
         operation.
       expiration_manager: The _interfaces.ExpirationManager for the operation.
+      protocol_manager: The _interfaces.ProtocolManager for the operation.
     """
     self._lock = lock
     self._pool = pool
     self._termination_manager = termination_manager
     self._transmission_manager = transmission_manager
     self._expiration_manager = expiration_manager
+    self._protocol_manager = protocol_manager
 
     if subscription is None:
       self._subscription_creator = subscription_creator
@@ -296,6 +298,8 @@ class _IngestionManager(_interfaces.IngestionManager):
           self._abort_and_notify(
               base.Outcome.Kind.REMOTE_FAILURE, code, details)
     elif outcome.return_value.subscription.kind is base.Subscription.Kind.FULL:
+      self._protocol_manager.set_protocol_receiver(
+          outcome.return_value.subscription.protocol_receiver)
       self._operator_post_create(outcome.return_value.subscription)
     else:
       # TODO(nathaniel): Support other subscriptions.
@@ -378,7 +382,7 @@ class _IngestionManager(_interfaces.IngestionManager):
 
 def invocation_ingestion_manager(
     subscription, lock, pool, termination_manager, transmission_manager,
-    expiration_manager):
+    expiration_manager, protocol_manager):
   """Creates an IngestionManager appropriate for invocation-side use.
 
   Args:
@@ -390,18 +394,20 @@ def invocation_ingestion_manager(
     transmission_manager: The _interfaces.TransmissionManager for the
       operation.
     expiration_manager: The _interfaces.ExpirationManager for the operation.
+    protocol_manager: The _interfaces.ProtocolManager for the operation.
 
   Returns:
     An IngestionManager appropriate for invocation-side use.
   """
   return _IngestionManager(
       lock, pool, subscription, None, termination_manager, transmission_manager,
-      expiration_manager)
+      expiration_manager, protocol_manager)
 
 
 def service_ingestion_manager(
     servicer, operation_context, output_operator, lock, pool,
-    termination_manager, transmission_manager, expiration_manager):
+    termination_manager, transmission_manager, expiration_manager,
+    protocol_manager):
   """Creates an IngestionManager appropriate for service-side use.
 
   The returned IngestionManager will require its set_group_and_name method to be
@@ -420,6 +426,7 @@ def service_ingestion_manager(
     transmission_manager: The _interfaces.TransmissionManager for the
       operation.
     expiration_manager: The _interfaces.ExpirationManager for the operation.
+    protocol_manager: The _interfaces.ProtocolManager for the operation.
 
   Returns:
     An IngestionManager appropriate for service-side use.
@@ -428,4 +435,4 @@ def service_ingestion_manager(
       servicer, operation_context, output_operator)
   return _IngestionManager(
       lock, pool, None, subscription_creator, termination_manager,
-      transmission_manager, expiration_manager)
+      transmission_manager, expiration_manager, protocol_manager)
diff --git a/src/python/grpcio/grpc/framework/core/_interfaces.py b/src/python/grpcio/grpc/framework/core/_interfaces.py
index 2a534cb7e7..ffa686b2b7 100644
--- a/src/python/grpcio/grpc/framework/core/_interfaces.py
+++ b/src/python/grpcio/grpc/framework/core/_interfaces.py
@@ -111,8 +111,8 @@ class TransmissionManager(object):
 
   @abc.abstractmethod
   def kick_off(
-      self, group, method, timeout, initial_metadata, payload, completion,
-      allowance):
+      self, group, method, timeout, protocol_options, initial_metadata,
+      payload, completion, allowance):
     """Transmits the values associated with operation invocation."""
     raise NotImplementedError()
 
@@ -203,6 +203,31 @@ class ExpirationManager(object):
     raise NotImplementedError()
 
 
+class ProtocolManager(object):
+  """A manager of protocol-specific values passing through an operation."""
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def set_protocol_receiver(self, protocol_receiver):
+    """Registers the customer object that will receive protocol objects.
+
+    Args:
+      protocol_receiver: A base.ProtocolReceiver to which protocol objects for
+        the operation should be passed.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def accept_protocol_context(self, protocol_context):
+    """Accepts the protocol context object for the operation.
+
+    Args:
+      protocol_context: An object designated for use as the protocol context
+        of the operation, with further semantics implementation-determined.
+    """
+    raise NotImplementedError()
+
+
 class EmissionManager(base.Operator):
   """A manager of values emitted by customer code."""
   __metaclass__ = abc.ABCMeta
diff --git a/src/python/grpcio/grpc/framework/core/_operation.py b/src/python/grpcio/grpc/framework/core/_operation.py
index f5679d0356..020c0c9ed9 100644
--- a/src/python/grpcio/grpc/framework/core/_operation.py
+++ b/src/python/grpcio/grpc/framework/core/_operation.py
@@ -36,6 +36,7 @@ from grpc.framework.core import _emission
 from grpc.framework.core import _expiration
 from grpc.framework.core import _ingestion
 from grpc.framework.core import _interfaces
+from grpc.framework.core import _protocol
 from grpc.framework.core import _reception
 from grpc.framework.core import _termination
 from grpc.framework.core import _transmission
@@ -84,8 +85,9 @@ class _EasyOperation(_interfaces.Operation):
 
 
 def invocation_operate(
-    operation_id, group, method, subscription, timeout, initial_metadata,
-    payload, completion, ticket_sink, termination_action, pool):
+    operation_id, group, method, subscription, timeout, protocol_options,
+    initial_metadata, payload, completion, ticket_sink, termination_action,
+    pool):
   """Constructs objects necessary for front-side operation management.
 
   Args:
@@ -95,6 +97,8 @@ def invocation_operate(
     subscription: A base.Subscription describing the customer's interest in the
       results of the operation.
     timeout: A length of time in seconds to allow for the operation.
+    protocol_options: A transport-specific, application-specific, and/or
+      protocol-specific value relating to the invocation. May be None.
     initial_metadata: An initial metadata value to be sent to the other side of
       the operation. May be None if the initial metadata will be passed later or
       if there will be no initial metadata passed at all.
@@ -120,23 +124,27 @@ def invocation_operate(
         operation_id, ticket_sink, lock, pool, termination_manager)
     expiration_manager = _expiration.invocation_expiration_manager(
         timeout, lock, termination_manager, transmission_manager)
+    protocol_manager = _protocol.invocation_protocol_manager(
+        subscription, lock, pool, termination_manager, transmission_manager,
+        expiration_manager)
     operation_context = _context.OperationContext(
         lock, termination_manager, transmission_manager, expiration_manager)
     emission_manager = _emission.EmissionManager(
         lock, termination_manager, transmission_manager, expiration_manager)
     ingestion_manager = _ingestion.invocation_ingestion_manager(
         subscription, lock, pool, termination_manager, transmission_manager,
-        expiration_manager)
+        expiration_manager, protocol_manager)
     reception_manager = _reception.ReceptionManager(
         termination_manager, transmission_manager, expiration_manager,
-        ingestion_manager)
+        protocol_manager, ingestion_manager)
 
     termination_manager.set_expiration_manager(expiration_manager)
     transmission_manager.set_expiration_manager(expiration_manager)
     emission_manager.set_ingestion_manager(ingestion_manager)
 
     transmission_manager.kick_off(
-        group, method, timeout, initial_metadata, payload, completion, None)
+        group, method, timeout, protocol_options, initial_metadata, payload,
+        completion, None)
 
   return _EasyOperation(
       lock, termination_manager, transmission_manager, expiration_manager,
@@ -170,16 +178,20 @@ def service_operate(
         ticket.timeout, servicer_package.default_timeout,
         servicer_package.maximum_timeout, lock, termination_manager,
         transmission_manager)
+    protocol_manager = _protocol.service_protocol_manager(
+        lock, pool, termination_manager, transmission_manager,
+        expiration_manager)
     operation_context = _context.OperationContext(
         lock, termination_manager, transmission_manager, expiration_manager)
     emission_manager = _emission.EmissionManager(
         lock, termination_manager, transmission_manager, expiration_manager)
     ingestion_manager = _ingestion.service_ingestion_manager(
         servicer_package.servicer, operation_context, emission_manager, lock,
-        pool, termination_manager, transmission_manager, expiration_manager)
+        pool, termination_manager, transmission_manager, expiration_manager,
+        protocol_manager)
     reception_manager = _reception.ReceptionManager(
         termination_manager, transmission_manager, expiration_manager,
-        ingestion_manager)
+        protocol_manager, ingestion_manager)
 
     termination_manager.set_expiration_manager(expiration_manager)
     transmission_manager.set_expiration_manager(expiration_manager)
diff --git a/src/python/grpcio/grpc/framework/core/_protocol.py b/src/python/grpcio/grpc/framework/core/_protocol.py
new file mode 100644
index 0000000000..3177b5e302
--- /dev/null
+++ b/src/python/grpcio/grpc/framework/core/_protocol.py
@@ -0,0 +1,176 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""State and behavior for passing protocol objects in an operation."""
+
+import collections
+import enum
+
+from grpc.framework.core import _constants
+from grpc.framework.core import _interfaces
+from grpc.framework.core import _utilities
+from grpc.framework.foundation import callable_util
+from grpc.framework.interfaces.base import base
+
+_EXCEPTION_LOG_MESSAGE = 'Exception delivering protocol object!'
+
+_LOCAL_FAILURE_OUTCOME = _utilities.Outcome(
+    base.Outcome.Kind.LOCAL_FAILURE, None, None)
+
+
+class _Awaited(
+    collections.namedtuple('_Awaited', ('kind', 'value',))):
+
+  @enum.unique
+  class Kind(enum.Enum):
+    NOT_YET_ARRIVED = 'not yet arrived'
+    ARRIVED = 'arrived'
+
+_NOT_YET_ARRIVED = _Awaited(_Awaited.Kind.NOT_YET_ARRIVED, None)
+_ARRIVED_AND_NONE = _Awaited(_Awaited.Kind.ARRIVED, None)
+
+
+class _Transitory(
+    collections.namedtuple('_Transitory', ('kind', 'value',))):
+
+  @enum.unique
+  class Kind(enum.Enum):
+    NOT_YET_SEEN = 'not yet seen'
+    PRESENT = 'present'
+    GONE = 'gone'
+
+_NOT_YET_SEEN = _Transitory(_Transitory.Kind.NOT_YET_SEEN, None)
+_GONE = _Transitory(_Transitory.Kind.GONE, None)
+
+
+class _ProtocolManager(_interfaces.ProtocolManager):
+  """An implementation of _interfaces.ExpirationManager."""
+
+  def __init__(
+      self, protocol_receiver, lock, pool, termination_manager,
+      transmission_manager, expiration_manager):
+    """Constructor.
+
+    Args:
+      protocol_receiver: An _Awaited wrapping of the base.ProtocolReceiver to
+        which protocol objects should be passed during the operation. May be
+        of kind _Awaited.Kind.NOT_YET_ARRIVED if the customer's subscription is
+        not yet known and may be of kind _Awaited.Kind.ARRIVED but with a value
+        of None if the customer's subscription did not include a
+        ProtocolReceiver.
+      lock: The operation-wide lock.
+      pool: A thread pool.
+      termination_manager: The _interfaces.TerminationManager for the operation.
+      transmission_manager: The _interfaces.TransmissionManager for the
+        operation.
+      expiration_manager: The _interfaces.ExpirationManager for the operation.
+    """
+    self._lock = lock
+    self._pool = pool
+    self._termination_manager = termination_manager
+    self._transmission_manager = transmission_manager
+    self._expiration_manager = expiration_manager
+
+    self._protocol_receiver = protocol_receiver
+    self._context = _NOT_YET_SEEN
+
+  def _abort_and_notify(self, outcome):
+    if self._termination_manager.outcome is None:
+      self._termination_manager.abort(outcome)
+      self._transmission_manager.abort(outcome)
+      self._expiration_manager.terminate()
+
+  def _deliver(self, behavior, value):
+    def deliver():
+      delivery_outcome = callable_util.call_logging_exceptions(
+          behavior, _EXCEPTION_LOG_MESSAGE, value)
+      if delivery_outcome.kind is callable_util.Outcome.Kind.RAISED:
+        with self._lock:
+          self._abort_and_notify(_LOCAL_FAILURE_OUTCOME)
+    self._pool.submit(
+        callable_util.with_exceptions_logged(
+            deliver, _constants.INTERNAL_ERROR_LOG_MESSAGE))
+
+  def set_protocol_receiver(self, protocol_receiver):
+    """See _interfaces.ProtocolManager.set_protocol_receiver for spec."""
+    self._protocol_receiver = _Awaited(_Awaited.Kind.ARRIVED, protocol_receiver)
+    if (self._context.kind is _Transitory.Kind.PRESENT and
+        protocol_receiver is not None):
+      self._deliver(protocol_receiver.context, self._context.value)
+      self._context = _GONE
+
+  def accept_protocol_context(self, protocol_context):
+    """See _interfaces.ProtocolManager.accept_protocol_context for spec."""
+    if self._protocol_receiver.kind is _Awaited.Kind.ARRIVED:
+      if self._protocol_receiver.value is not None:
+        self._deliver(self._protocol_receiver.value.context, protocol_context)
+      self._context = _GONE
+    else:
+      self._context = _Transitory(_Transitory.Kind.PRESENT, protocol_context)
+
+
+def invocation_protocol_manager(
+    subscription, lock, pool, termination_manager, transmission_manager,
+    expiration_manager):
+  """Creates an _interfaces.ProtocolManager for invocation-side use.
+
+  Args:
+    subscription: The local customer's subscription to the operation.
+    lock: The operation-wide lock.
+    pool: A thread pool.
+    termination_manager: The _interfaces.TerminationManager for the operation.
+    transmission_manager: The _interfaces.TransmissionManager for the
+      operation.
+    expiration_manager: The _interfaces.ExpirationManager for the operation.
+  """
+  if subscription.kind is base.Subscription.Kind.FULL:
+    awaited_protocol_receiver = _Awaited(
+        _Awaited.Kind.ARRIVED, subscription.protocol_receiver)
+  else:
+    awaited_protocol_receiver = _ARRIVED_AND_NONE
+  return _ProtocolManager(
+      awaited_protocol_receiver, lock, pool, termination_manager,
+      transmission_manager, expiration_manager)
+
+
+def service_protocol_manager(
+    lock, pool, termination_manager, transmission_manager, expiration_manager):
+  """Creates an _interfaces.ProtocolManager for service-side use.
+
+  Args:
+    lock: The operation-wide lock.
+    pool: A thread pool.
+    termination_manager: The _interfaces.TerminationManager for the operation.
+    transmission_manager: The _interfaces.TransmissionManager for the
+      operation.
+    expiration_manager: The _interfaces.ExpirationManager for the operation.
+  """
+  return _ProtocolManager(
+      _NOT_YET_ARRIVED, lock, pool, termination_manager, transmission_manager,
+      expiration_manager)
diff --git a/src/python/grpcio/grpc/framework/core/_reception.py b/src/python/grpcio/grpc/framework/core/_reception.py
index d374cf0c8c..ff81450dee 100644
--- a/src/python/grpcio/grpc/framework/core/_reception.py
+++ b/src/python/grpcio/grpc/framework/core/_reception.py
@@ -51,23 +51,31 @@ _RECEPTION_FAILURE_OUTCOME = _utilities.Outcome(
     base.Outcome.Kind.RECEPTION_FAILURE, None, None)
 
 
+def _carrying_protocol_context(ticket):
+  return ticket.protocol is not None and ticket.protocol.kind in (
+      links.Protocol.Kind.INVOCATION_CONTEXT,
+      links.Protocol.Kind.SERVICER_CONTEXT,)
+
+
 class ReceptionManager(_interfaces.ReceptionManager):
   """A ReceptionManager based around a _Receiver passed to it."""
 
   def __init__(
       self, termination_manager, transmission_manager, expiration_manager,
-      ingestion_manager):
+      protocol_manager, ingestion_manager):
     """Constructor.
 
     Args:
       termination_manager: The operation's _interfaces.TerminationManager.
       transmission_manager: The operation's _interfaces.TransmissionManager.
       expiration_manager: The operation's _interfaces.ExpirationManager.
+      protocol_manager: The operation's _interfaces.ProtocolManager.
       ingestion_manager: The operation's _interfaces.IngestionManager.
     """
     self._termination_manager = termination_manager
     self._transmission_manager = transmission_manager
     self._expiration_manager = expiration_manager
+    self._protocol_manager = protocol_manager
     self._ingestion_manager = ingestion_manager
 
     self._lowest_unseen_sequence_number = 0
@@ -100,6 +108,10 @@ class ReceptionManager(_interfaces.ReceptionManager):
   def _process_one(self, ticket):
     if ticket.sequence_number == 0:
       self._ingestion_manager.set_group_and_method(ticket.group, ticket.method)
+      if _carrying_protocol_context(ticket):
+        self._protocol_manager.accept_protocol_context(ticket.protocol.value)
+      else:
+        self._protocol_manager.accept_protocol_context(None)
     if ticket.timeout is not None:
       self._expiration_manager.change_timeout(ticket.timeout)
     if ticket.termination is None:
diff --git a/src/python/grpcio/grpc/framework/core/_transmission.py b/src/python/grpcio/grpc/framework/core/_transmission.py
index 8f852cfe9f..65b12c4160 100644
--- a/src/python/grpcio/grpc/framework/core/_transmission.py
+++ b/src/python/grpcio/grpc/framework/core/_transmission.py
@@ -207,18 +207,19 @@ class TransmissionManager(_interfaces.TransmissionManager):
     self._transmitting = True
 
   def kick_off(
-      self, group, method, timeout, initial_metadata, payload, completion,
-      allowance):
+      self, group, method, timeout, protocol_options, initial_metadata,
+      payload, completion, allowance):
     """See _interfaces.TransmissionManager.kickoff for specification."""
     # TODO(nathaniel): Support other subscriptions.
     subscription = links.Ticket.Subscription.FULL
     terminal_metadata, code, message, termination = _explode_completion(
         completion)
     self._remote_allowance = 1 if payload is None else 0
+    protocol = links.Protocol(links.Protocol.Kind.CALL_OPTION, protocol_options)
     ticket = links.Ticket(
         self._operation_id, 0, group, method, subscription, timeout, allowance,
         initial_metadata, payload, terminal_metadata, code, message,
-        termination, None)
+        termination, protocol)
     self._lowest_unused_sequence_number = 1
     self._transmit(ticket)
 
diff --git a/src/python/grpcio/grpc/framework/crust/_calls.py b/src/python/grpcio/grpc/framework/crust/_calls.py
index 4c6bf16f43..bff940d747 100644
--- a/src/python/grpcio/grpc/framework/crust/_calls.py
+++ b/src/python/grpcio/grpc/framework/crust/_calls.py
@@ -38,10 +38,14 @@ _ITERATOR_EXCEPTION_LOG_MESSAGE = 'Exception iterating over requests!'
 _EMPTY_COMPLETION = utilities.completion(None, None, None)
 
 
-def _invoke(end, group, method, timeout, initial_metadata, payload, complete):
+def _invoke(
+    end, group, method, timeout, protocol_options, initial_metadata, payload,
+    complete):
   rendezvous = _control.Rendezvous(None, None)
+  subscription = utilities.full_subscription(
+      rendezvous, _control.protocol_receiver(rendezvous))
   operation_context, operator = end.operate(
-      group, method, utilities.full_subscription(rendezvous), timeout,
+      group, method, subscription, timeout, protocol_options=protocol_options,
       initial_metadata=initial_metadata, payload=payload,
       completion=_EMPTY_COMPLETION if complete else None)
   rendezvous.set_operator_and_context(operator, operation_context)
@@ -93,36 +97,43 @@ def _event_return_stream(
 
 
 def blocking_unary_unary(
-    end, group, method, timeout, with_call, initial_metadata, payload):
+    end, group, method, timeout, with_call, protocol_options, initial_metadata,
+    payload):
   """Services in a blocking fashion a unary-unary servicer method."""
   rendezvous, unused_operation_context, unused_outcome = _invoke(
-      end, group, method, timeout, initial_metadata, payload, True)
+      end, group, method, timeout, protocol_options, initial_metadata, payload,
+      True)
   if with_call:
     return next(rendezvous), rendezvous
   else:
     return next(rendezvous)
 
 
-def future_unary_unary(end, group, method, timeout, initial_metadata, payload):
+def future_unary_unary(
+    end, group, method, timeout, protocol_options, initial_metadata, payload):
   """Services a value-in value-out servicer method by returning a Future."""
   rendezvous, unused_operation_context, unused_outcome = _invoke(
-      end, group, method, timeout, initial_metadata, payload, True)
+      end, group, method, timeout, protocol_options, initial_metadata, payload,
+      True)
   return rendezvous
 
 
-def inline_unary_stream(end, group, method, timeout, initial_metadata, payload):
+def inline_unary_stream(
+    end, group, method, timeout, protocol_options, initial_metadata, payload):
   """Services a value-in stream-out servicer method."""
   rendezvous, unused_operation_context, unused_outcome = _invoke(
-      end, group, method, timeout, initial_metadata, payload, True)
+      end, group, method, timeout, protocol_options, initial_metadata, payload,
+      True)
   return rendezvous
 
 
 def blocking_stream_unary(
-    end, group, method, timeout, with_call, initial_metadata, payload_iterator,
-    pool):
+    end, group, method, timeout, with_call, protocol_options, initial_metadata,
+    payload_iterator, pool):
   """Services in a blocking fashion a stream-in value-out servicer method."""
   rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, initial_metadata, None, False)
+      end, group, method, timeout, protocol_options, initial_metadata, None,
+      False)
   if outcome is None:
     def in_pool():
       for payload in payload_iterator:
@@ -141,10 +152,12 @@ def blocking_stream_unary(
 
 
 def future_stream_unary(
-    end, group, method, timeout, initial_metadata, payload_iterator, pool):
+    end, group, method, timeout, protocol_options, initial_metadata,
+    payload_iterator, pool):
   """Services a stream-in value-out servicer method by returning a Future."""
   rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, initial_metadata, None, False)
+      end, group, method, timeout, protocol_options, initial_metadata, None,
+      False)
   if outcome is None:
     def in_pool():
       for payload in payload_iterator:
@@ -155,10 +168,12 @@ def future_stream_unary(
 
 
 def inline_stream_stream(
-    end, group, method, timeout, initial_metadata, payload_iterator, pool):
+    end, group, method, timeout, protocol_options, initial_metadata,
+    payload_iterator, pool):
   """Services a stream-in stream-out servicer method."""
   rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, initial_metadata, None, False)
+      end, group, method, timeout, protocol_options, initial_metadata, None,
+      False)
   if outcome is None:
     def in_pool():
       for payload in payload_iterator:
@@ -169,36 +184,40 @@ def inline_stream_stream(
 
 
 def event_unary_unary(
-    end, group, method, timeout, initial_metadata, payload, receiver,
-    abortion_callback, pool):
+    end, group, method, timeout, protocol_options, initial_metadata, payload,
+    receiver, abortion_callback, pool):
   rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, initial_metadata, payload, True)
+      end, group, method, timeout, protocol_options, initial_metadata, payload,
+      True)
   return _event_return_unary(
       receiver, abortion_callback, rendezvous, operation_context, outcome, pool)
 
 
 def event_unary_stream(
-    end, group, method, timeout, initial_metadata, payload,
+    end, group, method, timeout, protocol_options, initial_metadata, payload,
     receiver, abortion_callback, pool):
   rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, initial_metadata, payload, True)
+      end, group, method, timeout, protocol_options, initial_metadata, payload,
+      True)
   return _event_return_stream(
       receiver, abortion_callback, rendezvous, operation_context, outcome, pool)
 
 
 def event_stream_unary(
-    end, group, method, timeout, initial_metadata, receiver, abortion_callback,
-    pool):
+    end, group, method, timeout, protocol_options, initial_metadata, receiver,
+    abortion_callback, pool):
   rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, initial_metadata, None, False)
+      end, group, method, timeout, protocol_options, initial_metadata, None,
+      False)
   return _event_return_unary(
       receiver, abortion_callback, rendezvous, operation_context, outcome, pool)
 
 
 def event_stream_stream(
-    end, group, method, timeout, initial_metadata, receiver, abortion_callback,
-    pool):
+    end, group, method, timeout, protocol_options, initial_metadata, receiver,
+    abortion_callback, pool):
   rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, initial_metadata, None, False)
+      end, group, method, timeout, protocol_options, initial_metadata, None,
+      False)
   return _event_return_stream(
       receiver, abortion_callback, rendezvous, operation_context, outcome, pool)
diff --git a/src/python/grpcio/grpc/framework/crust/_control.py b/src/python/grpcio/grpc/framework/crust/_control.py
index 7bddf46a57..5e9efdf732 100644
--- a/src/python/grpcio/grpc/framework/crust/_control.py
+++ b/src/python/grpcio/grpc/framework/crust/_control.py
@@ -182,6 +182,8 @@ class Rendezvous(base.Operator, future.Future, stream.Consumer, face.Call):
     self._operator = operator
     self._operation_context = operation_context
 
+    self._protocol_context = _NOT_YET_ARRIVED
+
     self._up_initial_metadata = _NOT_YET_ARRIVED
     self._up_payload = None
     self._up_allowance = 1
@@ -442,6 +444,16 @@ class Rendezvous(base.Operator, future.Future, stream.Consumer, face.Call):
         else:
           return self._termination.abortion
 
+  def protocol_context(self):
+    with self._condition:
+      while True:
+        if self._protocol_context.kind is _Awaited.Kind.ARRIVED:
+          return self._protocol_context.value
+        elif self._termination.abortion_error is not None:
+          raise self._termination.abortion_error
+        else:
+          self._condition.wait()
+
   def initial_metadata(self):
     with self._condition:
       while True:
@@ -514,11 +526,30 @@ class Rendezvous(base.Operator, future.Future, stream.Consumer, face.Call):
       else:
         self._down_details = _Transitory(_Transitory.Kind.PRESENT, details)
 
+  def set_protocol_context(self, protocol_context):
+    with self._condition:
+      self._protocol_context = _Awaited(
+          _Awaited.Kind.ARRIVED, protocol_context)
+      self._condition.notify_all()
+
   def set_outcome(self, outcome):
     with self._condition:
       return self._set_outcome(outcome)
 
 
+class _ProtocolReceiver(base.ProtocolReceiver):
+
+  def __init__(self, rendezvous):
+    self._rendezvous = rendezvous
+
+  def context(self, protocol_context):
+    self._rendezvous.set_protocol_context(protocol_context)
+
+
+def protocol_receiver(rendezvous):
+  return _ProtocolReceiver(rendezvous)
+
+
 def pool_wrap(behavior, operation_context):
   """Wraps an operation-related behavior so that it may be called in a pool.
 
diff --git a/src/python/grpcio/grpc/framework/crust/_service.py b/src/python/grpcio/grpc/framework/crust/_service.py
index 6ff7249e75..9903415c09 100644
--- a/src/python/grpcio/grpc/framework/crust/_service.py
+++ b/src/python/grpcio/grpc/framework/crust/_service.py
@@ -52,6 +52,9 @@ class _ServicerContext(face.ServicerContext):
   def cancel(self):
     self._rendezvous.cancel()
 
+  def protocol_context(self):
+    return self._rendezvous.protocol_context()
+
   def invocation_metadata(self):
     return self._rendezvous.initial_metadata()
 
@@ -71,10 +74,12 @@ class _ServicerContext(face.ServicerContext):
 def _adaptation(pool, in_pool):
   def adaptation(operator, operation_context):
     rendezvous = _control.Rendezvous(operator, operation_context)
+    subscription = utilities.full_subscription(
+        rendezvous, _control.protocol_receiver(rendezvous))
     outcome = operation_context.add_termination_callback(rendezvous.set_outcome)
     if outcome is None:
       pool.submit(_control.pool_wrap(in_pool, operation_context), rendezvous)
-      return utilities.full_subscription(rendezvous)
+      return subscription
     else:
       raise abandonment.Abandoned()
   return adaptation
@@ -151,6 +156,8 @@ def adapt_event_stream_stream(method, pool):
 def adapt_multi_method(multi_method, pool):
   def adaptation(group, method, operator, operation_context):
     rendezvous = _control.Rendezvous(operator, operation_context)
+    subscription = utilities.full_subscription(
+        rendezvous, _control.protocol_receiver(rendezvous))
     outcome = operation_context.add_termination_callback(rendezvous.set_outcome)
     if outcome is None:
       def in_pool():
@@ -160,7 +167,7 @@ def adapt_multi_method(multi_method, pool):
           request_consumer.consume(request)
         request_consumer.terminate()
       pool.submit(_control.pool_wrap(in_pool, operation_context), rendezvous)
-      return utilities.full_subscription(rendezvous)
+      return subscription
     else:
       raise abandonment.Abandoned()
   return adaptation
diff --git a/src/python/grpcio/grpc/framework/crust/implementations.py b/src/python/grpcio/grpc/framework/crust/implementations.py
index d38fab8ba0..4ebc4e9ae8 100644
--- a/src/python/grpcio/grpc/framework/crust/implementations.py
+++ b/src/python/grpcio/grpc/framework/crust/implementations.py
@@ -66,22 +66,23 @@ class _UnaryUnaryMultiCallable(face.UnaryUnaryMultiCallable):
     self._pool = pool
 
   def __call__(
-      self, request, timeout, metadata=None, with_call=False):
+      self, request, timeout, metadata=None, with_call=False,
+      protocol_options=None):
     return _calls.blocking_unary_unary(
         self._end, self._group, self._method, timeout, with_call,
-        metadata, request)
+        protocol_options, metadata, request)
 
-  def future(self, request, timeout, metadata=None):
+  def future(self, request, timeout, metadata=None, protocol_options=None):
     return _calls.future_unary_unary(
-        self._end, self._group, self._method, timeout, metadata,
-        request)
+        self._end, self._group, self._method, timeout, protocol_options,
+        metadata, request)
 
   def event(
       self, request, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     return _calls.event_unary_unary(
-        self._end, self._group, self._method, timeout, metadata,
-        request, receiver, abortion_callback, self._pool)
+        self._end, self._group, self._method, timeout, protocol_options,
+        metadata, request, receiver, abortion_callback, self._pool)
 
 
 class _UnaryStreamMultiCallable(face.UnaryStreamMultiCallable):
@@ -92,17 +93,17 @@ class _UnaryStreamMultiCallable(face.UnaryStreamMultiCallable):
     self._method = method
     self._pool = pool
 
-  def __call__(self, request, timeout, metadata=None):
+  def __call__(self, request, timeout, metadata=None, protocol_options=None):
     return _calls.inline_unary_stream(
-        self._end, self._group, self._method, timeout, metadata,
-        request)
+        self._end, self._group, self._method, timeout, protocol_options,
+        metadata, request)
 
   def event(
       self, request, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     return _calls.event_unary_stream(
-        self._end, self._group, self._method, timeout, metadata,
-        request, receiver, abortion_callback, self._pool)
+        self._end, self._group, self._method, timeout, protocol_options,
+        metadata, request, receiver, abortion_callback, self._pool)
 
 
 class _StreamUnaryMultiCallable(face.StreamUnaryMultiCallable):
@@ -115,21 +116,23 @@ class _StreamUnaryMultiCallable(face.StreamUnaryMultiCallable):
 
   def __call__(
       self, request_iterator, timeout, metadata=None,
-      with_call=False):
+      with_call=False, protocol_options=None):
     return _calls.blocking_stream_unary(
         self._end, self._group, self._method, timeout, with_call,
-        metadata, request_iterator, self._pool)
+        protocol_options, metadata, request_iterator, self._pool)
 
-  def future(self, request_iterator, timeout, metadata=None):
+  def future(
+      self, request_iterator, timeout, metadata=None, protocol_options=None):
     return _calls.future_stream_unary(
-        self._end, self._group, self._method, timeout, metadata,
-        request_iterator, self._pool)
+        self._end, self._group, self._method, timeout, protocol_options,
+        metadata, request_iterator, self._pool)
 
   def event(
-      self, receiver, abortion_callback, timeout, metadata=None):
+      self, receiver, abortion_callback, timeout, metadata=None,
+      protocol_options=None):
     return _calls.event_stream_unary(
-        self._end, self._group, self._method, timeout, metadata,
-        receiver, abortion_callback, self._pool)
+        self._end, self._group, self._method, timeout, protocol_options,
+        metadata, receiver, abortion_callback, self._pool)
 
 
 class _StreamStreamMultiCallable(face.StreamStreamMultiCallable):
@@ -140,16 +143,18 @@ class _StreamStreamMultiCallable(face.StreamStreamMultiCallable):
     self._method = method
     self._pool = pool
 
-  def __call__(self, request_iterator, timeout, metadata=None):
+  def __call__(
+      self, request_iterator, timeout, metadata=None, protocol_options=None):
     return _calls.inline_stream_stream(
-        self._end, self._group, self._method, timeout, metadata,
-        request_iterator, self._pool)
+        self._end, self._group, self._method, timeout, protocol_options,
+        metadata, request_iterator, self._pool)
 
   def event(
-      self, receiver, abortion_callback, timeout, metadata=None):
+      self, receiver, abortion_callback, timeout, metadata=None,
+      protocol_options=None):
     return _calls.event_stream_stream(
-        self._end, self._group, self._method, timeout, metadata,
-        receiver, abortion_callback, self._pool)
+        self._end, self._group, self._method, timeout, protocol_options,
+        metadata, receiver, abortion_callback, self._pool)
 
 
 class _GenericStub(face.GenericStub):
@@ -161,66 +166,70 @@ class _GenericStub(face.GenericStub):
 
   def blocking_unary_unary(
       self, group, method, request, timeout, metadata=None,
-      with_call=None):
+      with_call=None, protocol_options=None):
     return _calls.blocking_unary_unary(
-        self._end, group, method, timeout, with_call, metadata,
-        request)
+        self._end, group, method, timeout, with_call, protocol_options,
+        metadata, request)
 
   def future_unary_unary(
-      self, group, method, request, timeout, metadata=None):
+      self, group, method, request, timeout, metadata=None,
+      protocol_options=None):
     return _calls.future_unary_unary(
-        self._end, group, method, timeout, metadata, request)
+        self._end, group, method, timeout, protocol_options, metadata, request)
 
   def inline_unary_stream(
-      self, group, method, request, timeout, metadata=None):
+      self, group, method, request, timeout, metadata=None,
+      protocol_options=None):
     return _calls.inline_unary_stream(
-        self._end, group, method, timeout, metadata, request)
+        self._end, group, method, timeout, protocol_options, metadata, request)
 
   def blocking_stream_unary(
       self, group, method, request_iterator, timeout, metadata=None,
-      with_call=None):
+      with_call=None, protocol_options=None):
     return _calls.blocking_stream_unary(
-        self._end, group, method, timeout, with_call, metadata,
-        request_iterator, self._pool)
+        self._end, group, method, timeout, with_call, protocol_options,
+        metadata, request_iterator, self._pool)
 
   def future_stream_unary(
-      self, group, method, request_iterator, timeout, metadata=None):
+      self, group, method, request_iterator, timeout, metadata=None,
+      protocol_options=None):
     return _calls.future_stream_unary(
-        self._end, group, method, timeout, metadata,
+        self._end, group, method, timeout, protocol_options, metadata,
         request_iterator, self._pool)
 
   def inline_stream_stream(
-      self, group, method, request_iterator, timeout, metadata=None):
+      self, group, method, request_iterator, timeout, metadata=None,
+      protocol_options=None):
     return _calls.inline_stream_stream(
-        self._end, group, method, timeout, metadata,
+        self._end, group, method, timeout, protocol_options, metadata,
         request_iterator, self._pool)
 
   def event_unary_unary(
       self, group, method, request, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     return _calls.event_unary_unary(
-        self._end, group, method, timeout, metadata, request,
+        self._end, group, method, timeout, protocol_options, metadata, request,
         receiver, abortion_callback, self._pool)
 
   def event_unary_stream(
       self, group, method, request, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     return _calls.event_unary_stream(
-        self._end, group, method, timeout, metadata, request,
+        self._end, group, method, timeout, protocol_options, metadata, request,
         receiver, abortion_callback, self._pool)
 
   def event_stream_unary(
       self, group, method, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     return _calls.event_stream_unary(
-        self._end, group, method, timeout, metadata, receiver,
+        self._end, group, method, timeout, protocol_options, metadata, receiver,
         abortion_callback, self._pool)
 
   def event_stream_stream(
       self, group, method, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     return _calls.event_stream_stream(
-        self._end, group, method, timeout, metadata, receiver,
+        self._end, group, method, timeout, protocol_options, metadata, receiver,
         abortion_callback, self._pool)
 
   def unary_unary(self, group, method):
diff --git a/src/python/grpcio/grpc/framework/interfaces/base/base.py b/src/python/grpcio/grpc/framework/interfaces/base/base.py
index 0d9d6b464e..a1e70be5e8 100644
--- a/src/python/grpcio/grpc/framework/interfaces/base/base.py
+++ b/src/python/grpcio/grpc/framework/interfaces/base/base.py
@@ -184,6 +184,19 @@ class Operator(object):
     """
     raise NotImplementedError()
 
+class ProtocolReceiver(object):
+  """A means of receiving protocol values during an operation."""
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def context(self, protocol_context):
+    """Accepts the protocol context object for the operation.
+
+    Args:
+      protocol_context: The protocol context object for the operation.
+    """
+    raise NotImplementedError()
+
 
 class Subscription(object):
   """Describes customer code's interest in values from the other side.
@@ -199,7 +212,11 @@ class Subscription(object):
       otherwise.
     operator: An Operator to be passed values from the other side of the
       operation. Must be non-None if kind is Kind.FULL. Must be None otherwise.
+    protocol_receiver: A ProtocolReceiver to be passed protocol objects as they
+      become available during the operation. Must be non-None if kind is
+      Kind.FULL.
   """
+  __metaclass__ = abc.ABCMeta
 
   @enum.unique
   class Kind(enum.Enum):
@@ -274,7 +291,7 @@ class End(object):
   @abc.abstractmethod
   def operate(
       self, group, method, subscription, timeout, initial_metadata=None,
-      payload=None, completion=None):
+      payload=None, completion=None, protocol_options=None):
     """Commences an operation.
 
     Args:
@@ -290,6 +307,8 @@ class End(object):
       payload: An initial payload for the operation.
       completion: A Completion value indicating the end of transmission to the
         other side of the operation.
+      protocol_options: A value specified by the provider of a Base interface
+        implementation affording custom state and behavior.
 
     Returns:
       A pair of objects affording information about the operation and action
diff --git a/src/python/grpcio/grpc/framework/interfaces/base/utilities.py b/src/python/grpcio/grpc/framework/interfaces/base/utilities.py
index a9ee1a0981..87a85018f5 100644
--- a/src/python/grpcio/grpc/framework/interfaces/base/utilities.py
+++ b/src/python/grpcio/grpc/framework/interfaces/base/utilities.py
@@ -45,11 +45,12 @@ class _Subscription(
     base.Subscription,
     collections.namedtuple(
         '_Subscription',
-        ('kind', 'termination_callback', 'allowance', 'operator',))):
+        ('kind', 'termination_callback', 'allowance', 'operator',
+         'protocol_receiver',))):
   """A trivial implementation of base.Subscription."""
 
 _NONE_SUBSCRIPTION = _Subscription(
-    base.Subscription.Kind.NONE, None, None, None)
+    base.Subscription.Kind.NONE, None, None, None, None)
 
 
 def completion(terminal_metadata, code, message):
@@ -66,14 +67,16 @@ def completion(terminal_metadata, code, message):
   return _Completion(terminal_metadata, code, message)
 
 
-def full_subscription(operator):
+def full_subscription(operator, protocol_receiver):
   """Creates a "full" base.Subscription for the given base.Operator.
 
   Args:
     operator: A base.Operator to be used in an operation.
+    protocol_receiver: A base.ProtocolReceiver to be used in an operation.
 
   Returns:
     A base.Subscription of kind base.Subscription.Kind.FULL wrapping the given
-      base.Operator.
+      base.Operator and base.ProtocolReceiver.
   """
-  return _Subscription(base.Subscription.Kind.FULL, None, None, operator)
+  return _Subscription(
+      base.Subscription.Kind.FULL, None, None, operator, protocol_receiver)
diff --git a/src/python/grpcio/grpc/framework/interfaces/face/face.py b/src/python/grpcio/grpc/framework/interfaces/face/face.py
index 948e7505b6..bc9a434a76 100644
--- a/src/python/grpcio/grpc/framework/interfaces/face/face.py
+++ b/src/python/grpcio/grpc/framework/interfaces/face/face.py
@@ -184,6 +184,16 @@ class RpcContext(object):
     """
     raise NotImplementedError()
 
+  @abc.abstractmethod
+  def protocol_context(self):
+    """Accesses a custom object specified by an implementation provider.
+
+    Returns:
+      A value specified by the provider of a Face interface implementation
+        affording custom state and behavior.
+    """
+    raise NotImplementedError()
+
 
 class Call(RpcContext):
   """Invocation-side utility object for an RPC."""
@@ -354,7 +364,8 @@ class UnaryUnaryMultiCallable(object):
 
   @abc.abstractmethod
   def __call__(
-      self, request, timeout, metadata=None, with_call=False):
+      self, request, timeout, metadata=None, with_call=False,
+      protocol_options=None):
     """Synchronously invokes the underlying RPC.
 
     Args:
@@ -364,6 +375,8 @@ class UnaryUnaryMultiCallable(object):
         the RPC.
       with_call: Whether or not to include return a Call for the RPC in addition
         to the reponse.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       The response value for the RPC, and a Call for the RPC if with_call was
@@ -375,7 +388,7 @@ class UnaryUnaryMultiCallable(object):
     raise NotImplementedError()
 
   @abc.abstractmethod
-  def future(self, request, timeout, metadata=None):
+  def future(self, request, timeout, metadata=None, protocol_options=None):
     """Asynchronously invokes the underlying RPC.
 
     Args:
@@ -383,6 +396,8 @@ class UnaryUnaryMultiCallable(object):
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of
         the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       An object that is both a Call for the RPC and a future.Future. In the
@@ -395,7 +410,7 @@ class UnaryUnaryMultiCallable(object):
   @abc.abstractmethod
   def event(
       self, request, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     """Asynchronously invokes the underlying RPC.
 
     Args:
@@ -406,6 +421,8 @@ class UnaryUnaryMultiCallable(object):
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of
         the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       A Call for the RPC.
@@ -418,7 +435,7 @@ class UnaryStreamMultiCallable(object):
   __metaclass__ = abc.ABCMeta
 
   @abc.abstractmethod
-  def __call__(self, request, timeout, metadata=None):
+  def __call__(self, request, timeout, metadata=None, protocol_options=None):
     """Invokes the underlying RPC.
 
     Args:
@@ -426,6 +443,8 @@ class UnaryStreamMultiCallable(object):
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of
         the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       An object that is both a Call for the RPC and an iterator of response
@@ -437,7 +456,7 @@ class UnaryStreamMultiCallable(object):
   @abc.abstractmethod
   def event(
       self, request, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     """Asynchronously invokes the underlying RPC.
 
     Args:
@@ -448,6 +467,8 @@ class UnaryStreamMultiCallable(object):
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of
         the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       A Call object for the RPC.
@@ -462,7 +483,7 @@ class StreamUnaryMultiCallable(object):
   @abc.abstractmethod
   def __call__(
       self, request_iterator, timeout, metadata=None,
-      with_call=False):
+      with_call=False, protocol_options=None):
     """Synchronously invokes the underlying RPC.
 
     Args:
@@ -472,6 +493,8 @@ class StreamUnaryMultiCallable(object):
         the RPC.
       with_call: Whether or not to include return a Call for the RPC in addition
         to the reponse.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       The response value for the RPC, and a Call for the RPC if with_call was
@@ -483,7 +506,8 @@ class StreamUnaryMultiCallable(object):
     raise NotImplementedError()
 
   @abc.abstractmethod
-  def future(self, request_iterator, timeout, metadata=None):
+  def future(
+      self, request_iterator, timeout, metadata=None, protocol_options=None):
     """Asynchronously invokes the underlying RPC.
 
     Args:
@@ -491,6 +515,8 @@ class StreamUnaryMultiCallable(object):
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of
         the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       An object that is both a Call for the RPC and a future.Future. In the
@@ -502,7 +528,8 @@ class StreamUnaryMultiCallable(object):
 
   @abc.abstractmethod
   def event(
-      self, receiver, abortion_callback, timeout, metadata=None):
+      self, receiver, abortion_callback, timeout, metadata=None,
+      protocol_options=None):
     """Asynchronously invokes the underlying RPC.
 
     Args:
@@ -512,6 +539,8 @@ class StreamUnaryMultiCallable(object):
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of
         the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       A single object that is both a Call object for the RPC and a
@@ -525,7 +554,8 @@ class StreamStreamMultiCallable(object):
   __metaclass__ = abc.ABCMeta
 
   @abc.abstractmethod
-  def __call__(self, request_iterator, timeout, metadata=None):
+  def __call__(
+      self, request_iterator, timeout, metadata=None, protocol_options=None):
     """Invokes the underlying RPC.
 
     Args:
@@ -533,6 +563,8 @@ class StreamStreamMultiCallable(object):
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of
         the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       An object that is both a Call for the RPC and an iterator of response
@@ -543,7 +575,8 @@ class StreamStreamMultiCallable(object):
 
   @abc.abstractmethod
   def event(
-      self, receiver, abortion_callback, timeout, metadata=None):
+      self, receiver, abortion_callback, timeout, metadata=None,
+      protocol_options=None):
     """Asynchronously invokes the underlying RPC.
 
     Args:
@@ -553,6 +586,8 @@ class StreamStreamMultiCallable(object):
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of
         the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       A single object that is both a Call object for the RPC and a
@@ -646,7 +681,7 @@ class GenericStub(object):
   @abc.abstractmethod
   def blocking_unary_unary(
       self, group, method, request, timeout, metadata=None,
-      with_call=False):
+      with_call=False, protocol_options=None):
     """Invokes a unary-request-unary-response method.
 
     This method blocks until either returning the response value of the RPC
@@ -661,6 +696,8 @@ class GenericStub(object):
       metadata: A metadata value to be passed to the service-side of the RPC.
       with_call: Whether or not to include return a Call for the RPC in addition
         to the reponse.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       The response value for the RPC, and a Call for the RPC if with_call was
@@ -673,7 +710,8 @@ class GenericStub(object):
 
   @abc.abstractmethod
   def future_unary_unary(
-      self, group, method, request, timeout, metadata=None):
+      self, group, method, request, timeout, metadata=None,
+      protocol_options=None):
     """Invokes a unary-request-unary-response method.
 
     Args:
@@ -682,6 +720,8 @@ class GenericStub(object):
       request: The request value for the RPC.
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       An object that is both a Call for the RPC and a future.Future. In the
@@ -693,7 +733,8 @@ class GenericStub(object):
 
   @abc.abstractmethod
   def inline_unary_stream(
-      self, group, method, request, timeout, metadata=None):
+      self, group, method, request, timeout, metadata=None,
+      protocol_options=None):
     """Invokes a unary-request-stream-response method.
 
     Args:
@@ -702,6 +743,8 @@ class GenericStub(object):
       request: The request value for the RPC.
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       An object that is both a Call for the RPC and an iterator of response
@@ -713,7 +756,7 @@ class GenericStub(object):
   @abc.abstractmethod
   def blocking_stream_unary(
       self, group, method, request_iterator, timeout, metadata=None,
-      with_call=False):
+      with_call=False, protocol_options=None):
     """Invokes a stream-request-unary-response method.
 
     This method blocks until either returning the response value of the RPC
@@ -728,6 +771,8 @@ class GenericStub(object):
       metadata: A metadata value to be passed to the service-side of the RPC.
       with_call: Whether or not to include return a Call for the RPC in addition
         to the reponse.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       The response value for the RPC, and a Call for the RPC if with_call was
@@ -740,7 +785,8 @@ class GenericStub(object):
 
   @abc.abstractmethod
   def future_stream_unary(
-      self, group, method, request_iterator, timeout, metadata=None):
+      self, group, method, request_iterator, timeout, metadata=None,
+      protocol_options=None):
     """Invokes a stream-request-unary-response method.
 
     Args:
@@ -749,6 +795,8 @@ class GenericStub(object):
       request_iterator: An iterator that yields request values for the RPC.
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       An object that is both a Call for the RPC and a future.Future. In the
@@ -760,7 +808,8 @@ class GenericStub(object):
 
   @abc.abstractmethod
   def inline_stream_stream(
-      self, group, method, request_iterator, timeout, metadata=None):
+      self, group, method, request_iterator, timeout, metadata=None,
+      protocol_options=None):
     """Invokes a stream-request-stream-response method.
 
     Args:
@@ -769,6 +818,8 @@ class GenericStub(object):
       request_iterator: An iterator that yields request values for the RPC.
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       An object that is both a Call for the RPC and an iterator of response
@@ -780,7 +831,7 @@ class GenericStub(object):
   @abc.abstractmethod
   def event_unary_unary(
       self, group, method, request, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     """Event-driven invocation of a unary-request-unary-response method.
 
     Args:
@@ -792,6 +843,8 @@ class GenericStub(object):
         in the event of RPC abortion.
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       A Call for the RPC.
@@ -801,7 +854,7 @@ class GenericStub(object):
   @abc.abstractmethod
   def event_unary_stream(
       self, group, method, request, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     """Event-driven invocation of a unary-request-stream-response method.
 
     Args:
@@ -813,6 +866,8 @@ class GenericStub(object):
         in the event of RPC abortion.
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       A Call for the RPC.
@@ -822,7 +877,7 @@ class GenericStub(object):
   @abc.abstractmethod
   def event_stream_unary(
       self, group, method, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     """Event-driven invocation of a unary-request-unary-response method.
 
     Args:
@@ -833,6 +888,8 @@ class GenericStub(object):
         in the event of RPC abortion.
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       A pair of a Call object for the RPC and a stream.Consumer to which the
@@ -843,7 +900,7 @@ class GenericStub(object):
   @abc.abstractmethod
   def event_stream_stream(
       self, group, method, receiver, abortion_callback, timeout,
-      metadata=None):
+      metadata=None, protocol_options=None):
     """Event-driven invocation of a unary-request-stream-response method.
 
     Args:
@@ -854,6 +911,8 @@ class GenericStub(object):
         in the event of RPC abortion.
       timeout: A duration of time in seconds to allow for the RPC.
       metadata: A metadata value to be passed to the service-side of the RPC.
+      protocol_options: A value specified by the provider of a Face interface
+        implementation affording custom state and behavior.
 
     Returns:
       A pair of a Call object for the RPC and a stream.Consumer to which the
diff --git a/src/python/grpcio/grpc/framework/interfaces/links/links.py b/src/python/grpcio/grpc/framework/interfaces/links/links.py
index b98a30a399..24f0e3b354 100644
--- a/src/python/grpcio/grpc/framework/interfaces/links/links.py
+++ b/src/python/grpcio/grpc/framework/interfaces/links/links.py
@@ -34,14 +34,13 @@ import collections
 import enum
 
 
-class Transport(collections.namedtuple('Transport', ('kind', 'value',))):
-  """A sum type for handles to an underlying transport system.
+class Protocol(collections.namedtuple('Protocol', ('kind', 'value',))):
+  """A sum type for handles to a system that transmits tickets.
 
   Attributes:
-    kind: A Kind value identifying the kind of value being passed to or from
-      the underlying transport.
-    value: The value being passed through RPC Framework between the high-level
-      application and the underlying transport.
+    kind: A Kind value identifying the kind of value being passed.
+    value: The value being passed between the high-level application and the
+      system affording ticket transport.
   """
 
   @enum.unique
@@ -56,8 +55,7 @@ class Ticket(
         'Ticket',
         ('operation_id', 'sequence_number', 'group', 'method', 'subscription',
          'timeout', 'allowance', 'initial_metadata', 'payload',
-         'terminal_metadata', 'code', 'message', 'termination',
-         'transport',))):
+         'terminal_metadata', 'code', 'message', 'termination', 'protocol',))):
   """A sum type for all values sent from a front to a back.
 
   Attributes:
@@ -99,8 +97,8 @@ class Ticket(
     termination: A Termination value describing the end of the operation, or
       None if the operation has not yet terminated. If set, no further tickets
       may be sent in the same direction.
-    transport: A Transport value or None, with further semantics being a matter
-      between high-level application and underlying transport.
+    protocol: A Protocol value or None, with further semantics being a matter
+      between high-level application and underlying ticket transport.
   """
 
   @enum.unique
diff --git a/src/python/grpcio/requirements.txt b/src/python/grpcio/requirements.txt
index 43395df03b..608ba402e0 100644
--- a/src/python/grpcio/requirements.txt
+++ b/src/python/grpcio/requirements.txt
@@ -1,3 +1,2 @@
 enum34==1.0.4
 futures==2.2.0
-protobuf==3.0.0a3
diff --git a/src/python/grpcio/setup.py b/src/python/grpcio/setup.py
index 4735ce080b..151b2bfcb4 100644
--- a/src/python/grpcio/setup.py
+++ b/src/python/grpcio/setup.py
@@ -104,7 +104,7 @@ _COMMAND_CLASS = {
 
 setuptools.setup(
     name='grpcio',
-    version='0.11.0',
+    version='0.11.0b0',
     ext_modules=_EXTENSION_MODULES,
     packages=list(_PACKAGES),
     package_dir=_PACKAGE_DIRECTORIES,
diff --git a/src/python/grpcio_health_checking/setup.py b/src/python/grpcio_health_checking/setup.py
index fcde0dab8c..35253ba312 100644
--- a/src/python/grpcio_health_checking/setup.py
+++ b/src/python/grpcio_health_checking/setup.py
@@ -51,7 +51,7 @@ _PACKAGE_DIRECTORIES = {
 }
 
 _INSTALL_REQUIRES = (
-    'grpcio>=0.10.0a0',
+    'grpcio>=0.11.0b0',
 )
 
 _SETUP_REQUIRES = _INSTALL_REQUIRES
@@ -63,7 +63,7 @@ _COMMAND_CLASS = {
 
 setuptools.setup(
     name='grpcio_health_checking',
-    version='0.10.0a0',
+    version='0.11.0b0',
     packages=list(_PACKAGES),
     package_dir=_PACKAGE_DIRECTORIES,
     install_requires=_INSTALL_REQUIRES,
diff --git a/src/python/grpcio_test/grpc_protoc_plugin/beta_python_plugin_test.py b/src/python/grpcio_test/grpc_protoc_plugin/beta_python_plugin_test.py
index 4c8c64b06d..259b978de2 100644
--- a/src/python/grpcio_test/grpc_protoc_plugin/beta_python_plugin_test.py
+++ b/src/python/grpcio_test/grpc_protoc_plugin/beta_python_plugin_test.py
@@ -42,7 +42,7 @@ import threading
 import time
 import unittest
 
-from grpc.beta import beta
+from grpc.beta import implementations
 from grpc.framework.foundation import future
 from grpc.framework.interfaces.face import face
 from grpc_test.framework.common import test_constants
@@ -170,7 +170,7 @@ def _CreateService(test_pb2):
   server = getattr(test_pb2, SERVER_FACTORY_IDENTIFIER)(servicer)
   port = server.add_insecure_port('[::]:0')
   server.start()
-  channel = beta.create_insecure_channel('localhost', port)
+  channel = implementations.insecure_channel('localhost', port)
   stub = getattr(test_pb2, STUB_FACTORY_IDENTIFIER)(channel)
   yield servicer_methods, stub
   server.stop(0)
diff --git a/src/python/grpcio_test/grpc_test/_adapter/_intermediary_low_test.py b/src/python/grpcio_test/grpc_test/_adapter/_intermediary_low_test.py
index 27a5b82e9c..90ad0b9bcb 100644
--- a/src/python/grpcio_test/grpc_test/_adapter/_intermediary_low_test.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_intermediary_low_test.py
@@ -191,7 +191,7 @@ class EchoTest(unittest.TestCase):
                      metadata[server_leading_binary_metadata_key])
 
     for datum in test_data:
-      client_call.write(datum, write_tag)
+      client_call.write(datum, write_tag, _low.WriteFlags.WRITE_NO_COMPRESS)
       write_accepted = self.client_events.get()
       self.assertIsNotNone(write_accepted)
       self.assertIs(write_accepted.kind, _low.Event.Kind.WRITE_ACCEPTED)
@@ -206,7 +206,7 @@ class EchoTest(unittest.TestCase):
       self.assertIsNotNone(read_accepted.bytes)
       server_data.append(read_accepted.bytes)
 
-      server_call.write(read_accepted.bytes, write_tag)
+      server_call.write(read_accepted.bytes, write_tag, 0)
       write_accepted = self.server_events.get()
       self.assertIsNotNone(write_accepted)
       self.assertEqual(_low.Event.Kind.WRITE_ACCEPTED, write_accepted.kind)
@@ -370,14 +370,14 @@ class CancellationTest(unittest.TestCase):
     self.assertIsNotNone(metadata_accepted)
 
     for datum in test_data:
-      client_call.write(datum, write_tag)
+      client_call.write(datum, write_tag, 0)
       write_accepted = self.client_events.get()
 
       server_call.read(read_tag)
       read_accepted = self.server_events.get()
       server_data.append(read_accepted.bytes)
 
-      server_call.write(read_accepted.bytes, write_tag)
+      server_call.write(read_accepted.bytes, write_tag, 0)
       write_accepted = self.server_events.get()
       self.assertIsNotNone(write_accepted)
 
diff --git a/src/python/grpcio_test/grpc_test/beta/_beta_features_test.py b/src/python/grpcio_test/grpc_test/beta/_beta_features_test.py
new file mode 100644
index 0000000000..fad57da9d0
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/beta/_beta_features_test.py
@@ -0,0 +1,232 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Tests Face interface compliance of the gRPC Python Beta API."""
+
+import threading
+import unittest
+
+from grpc.beta import implementations
+from grpc.beta import interfaces
+from grpc.framework.common import cardinality
+from grpc.framework.interfaces.face import utilities
+from grpc_test import resources
+from grpc_test.beta import test_utilities
+from grpc_test.framework.common import test_constants
+
+_SERVER_HOST_OVERRIDE = 'foo.test.google.fr'
+
+_GROUP = 'group'
+_UNARY_UNARY = 'unary-unary'
+_UNARY_STREAM = 'unary-stream'
+_STREAM_UNARY = 'stream-unary'
+_STREAM_STREAM = 'stream-stream'
+
+_REQUEST = b'abc'
+_RESPONSE = b'123'
+
+
+class _Servicer(object):
+
+  def __init__(self):
+    self._condition = threading.Condition()
+    self._peer = None
+    self._serviced = False
+
+  def unary_unary(self, request, context):
+    with self._condition:
+      self._request = request
+      self._peer = context.protocol_context().peer()
+      context.protocol_context().disable_next_response_compression()
+      self._serviced = True
+      self._condition.notify_all()
+      return _RESPONSE
+
+  def unary_stream(self, request, context):
+    with self._condition:
+      self._request = request
+      self._peer = context.protocol_context().peer()
+      context.protocol_context().disable_next_response_compression()
+      self._serviced = True
+      self._condition.notify_all()
+      return
+      yield
+
+  def stream_unary(self, request_iterator, context):
+    for request in request_iterator:
+      self._request = request
+    with self._condition:
+      self._peer = context.protocol_context().peer()
+      context.protocol_context().disable_next_response_compression()
+      self._serviced = True
+      self._condition.notify_all()
+      return _RESPONSE
+
+  def stream_stream(self, request_iterator, context):
+    for request in request_iterator:
+      with self._condition:
+        self._peer = context.protocol_context().peer()
+        context.protocol_context().disable_next_response_compression()
+        yield _RESPONSE
+    with self._condition:
+      self._serviced = True
+      self._condition.notify_all()
+
+  def peer(self):
+    with self._condition:
+      return self._peer
+
+  def block_until_serviced(self):
+    with self._condition:
+      while not self._serviced:
+        self._condition.wait()
+
+
+class _BlockingIterator(object):
+
+  def __init__(self, upstream):
+    self._condition = threading.Condition()
+    self._upstream = upstream
+    self._allowed = []
+
+  def __iter__(self):
+    return self
+
+  def next(self):
+    with self._condition:
+      while True:
+        if self._allowed is None:
+          raise StopIteration()
+        elif self._allowed:
+          return self._allowed.pop(0)
+        else:
+          self._condition.wait()
+
+  def allow(self):
+    with self._condition:
+      try:
+        self._allowed.append(next(self._upstream))
+      except StopIteration:
+        self._allowed = None
+      self._condition.notify_all()
+
+
+class BetaFeaturesTest(unittest.TestCase):
+
+  def setUp(self):
+    self._servicer = _Servicer()
+    method_implementations = {
+        (_GROUP, _UNARY_UNARY):
+            utilities.unary_unary_inline(self._servicer.unary_unary),
+        (_GROUP, _UNARY_STREAM):
+            utilities.unary_stream_inline(self._servicer.unary_stream),
+        (_GROUP, _STREAM_UNARY):
+            utilities.stream_unary_inline(self._servicer.stream_unary),
+        (_GROUP, _STREAM_STREAM):
+            utilities.stream_stream_inline(self._servicer.stream_stream),
+    }
+
+    cardinalities = {
+        _UNARY_UNARY: cardinality.Cardinality.UNARY_UNARY,
+        _UNARY_STREAM: cardinality.Cardinality.UNARY_STREAM,
+        _STREAM_UNARY: cardinality.Cardinality.STREAM_UNARY,
+        _STREAM_STREAM: cardinality.Cardinality.STREAM_STREAM,
+    }
+
+    server_options = implementations.server_options(
+        thread_pool_size=test_constants.POOL_SIZE)
+    self._server = implementations.server(
+        method_implementations, options=server_options)
+    server_credentials = implementations.ssl_server_credentials(
+        [(resources.private_key(), resources.certificate_chain(),),])
+    port = self._server.add_secure_port('[::]:0', server_credentials)
+    self._server.start()
+    self._client_credentials = implementations.ssl_client_credentials(
+        resources.test_root_certificates(), None, None)
+    channel = test_utilities.not_really_secure_channel(
+        'localhost', port, self._client_credentials, _SERVER_HOST_OVERRIDE)
+    stub_options = implementations.stub_options(
+        thread_pool_size=test_constants.POOL_SIZE)
+    self._dynamic_stub = implementations.dynamic_stub(
+        channel, _GROUP, cardinalities, options=stub_options)
+
+  def tearDown(self):
+    self._dynamic_stub = None
+    self._server.stop(test_constants.SHORT_TIMEOUT).wait()
+
+  def test_unary_unary(self):
+    call_options = interfaces.grpc_call_options(
+        disable_compression=True, credentials=self._client_credentials)
+    response = getattr(self._dynamic_stub, _UNARY_UNARY)(
+        _REQUEST, test_constants.LONG_TIMEOUT, protocol_options=call_options)
+    self.assertEqual(_RESPONSE, response)
+    self.assertIsNotNone(self._servicer.peer())
+
+  def test_unary_stream(self):
+    call_options = interfaces.grpc_call_options(
+        disable_compression=True, credentials=self._client_credentials)
+    response_iterator = getattr(self._dynamic_stub, _UNARY_STREAM)(
+        _REQUEST, test_constants.LONG_TIMEOUT, protocol_options=call_options)
+    self._servicer.block_until_serviced()
+    self.assertIsNotNone(self._servicer.peer())
+
+  def test_stream_unary(self):
+    call_options = interfaces.grpc_call_options(
+        credentials=self._client_credentials)
+    request_iterator = _BlockingIterator(iter((_REQUEST,)))
+    response_future = getattr(self._dynamic_stub, _STREAM_UNARY).future(
+        request_iterator, test_constants.LONG_TIMEOUT,
+        protocol_options=call_options)
+    response_future.protocol_context().disable_next_request_compression()
+    request_iterator.allow()
+    response_future.protocol_context().disable_next_request_compression()
+    request_iterator.allow()
+    self._servicer.block_until_serviced()
+    self.assertIsNotNone(self._servicer.peer())
+    self.assertEqual(_RESPONSE, response_future.result())
+
+  def test_stream_stream(self):
+    call_options = interfaces.grpc_call_options(
+        credentials=self._client_credentials)
+    request_iterator = _BlockingIterator(iter((_REQUEST,)))
+    response_iterator = getattr(self._dynamic_stub, _STREAM_STREAM)(
+        request_iterator, test_constants.SHORT_TIMEOUT,
+        protocol_options=call_options)
+    response_iterator.protocol_context().disable_next_request_compression()
+    request_iterator.allow()
+    response = next(response_iterator)
+    response_iterator.protocol_context().disable_next_request_compression()
+    request_iterator.allow()
+    self._servicer.block_until_serviced()
+    self.assertIsNotNone(self._servicer.peer())
+    self.assertEqual(_RESPONSE, response)
+
+
+if __name__ == '__main__':
+  unittest.main(verbosity=2)
diff --git a/src/python/grpcio_test/grpc_test/beta/_connectivity_channel_test.py b/src/python/grpcio_test/grpc_test/beta/_connectivity_channel_test.py
index 038464889d..b3c05bdb0c 100644
--- a/src/python/grpcio_test/grpc_test/beta/_connectivity_channel_test.py
+++ b/src/python/grpcio_test/grpc_test/beta/_connectivity_channel_test.py
@@ -36,14 +36,9 @@ import unittest
 from grpc._adapter import _low
 from grpc._adapter import _types
 from grpc.beta import _connectivity_channel
+from grpc.beta import interfaces
 from grpc_test.framework.common import test_constants
 
-_MAPPING_FUNCTION = lambda integer: integer * 200 + 17
-_MAPPING = {
-    state: _MAPPING_FUNCTION(state) for state in _types.ConnectivityState}
-_IDLE, _CONNECTING, _READY, _TRANSIENT_FAILURE, _FATAL_FAILURE = map(
-    _MAPPING_FUNCTION, _types.ConnectivityState)
-
 
 def _drive_completion_queue(completion_queue):
   while True:
@@ -84,7 +79,7 @@ class ChannelConnectivityTest(unittest.TestCase):
     callback = _Callback()
 
     connectivity_channel = _connectivity_channel.ConnectivityChannel(
-        low_channel, _MAPPING)
+        low_channel)
     connectivity_channel.subscribe(callback.update, try_to_connect=False)
     first_connectivities = callback.block_until_connectivities_satisfy(bool)
     connectivity_channel.subscribe(callback.update, try_to_connect=True)
@@ -98,11 +93,16 @@ class ChannelConnectivityTest(unittest.TestCase):
     connectivity_channel.unsubscribe(callback.update)
     fifth_connectivities = callback.connectivities()
 
-    self.assertSequenceEqual((_IDLE,), first_connectivities)
-    self.assertNotIn(_READY, second_connectivities)
-    self.assertNotIn(_READY, third_connectivities)
-    self.assertNotIn(_READY, fourth_connectivities)
-    self.assertNotIn(_READY, fifth_connectivities)
+    self.assertSequenceEqual(
+        (interfaces.ChannelConnectivity.IDLE,), first_connectivities)
+    self.assertNotIn(
+        interfaces.ChannelConnectivity.READY, second_connectivities)
+    self.assertNotIn(
+        interfaces.ChannelConnectivity.READY, third_connectivities)
+    self.assertNotIn(
+        interfaces.ChannelConnectivity.READY, fourth_connectivities)
+    self.assertNotIn(
+        interfaces.ChannelConnectivity.READY, fifth_connectivities)
 
   def test_immediately_connectable_channel_connectivity(self):
     server_completion_queue = _low.CompletionQueue()
@@ -117,7 +117,7 @@ class ChannelConnectivityTest(unittest.TestCase):
     second_callback = _Callback()
 
     connectivity_channel = _connectivity_channel.ConnectivityChannel(
-        low_channel, _MAPPING)
+        low_channel)
     connectivity_channel.subscribe(first_callback.update, try_to_connect=False)
     first_connectivities = first_callback.block_until_connectivities_satisfy(
         bool)
@@ -132,9 +132,11 @@ class ChannelConnectivityTest(unittest.TestCase):
         bool)
     # Wait for a connection that will happen (or may already have happened).
     first_callback.block_until_connectivities_satisfy(
-        lambda connectivities: _READY in connectivities)
+        lambda connectivities:
+        interfaces.ChannelConnectivity.READY in connectivities)
     second_callback.block_until_connectivities_satisfy(
-        lambda connectivities: _READY in connectivities)
+        lambda connectivities:
+        interfaces.ChannelConnectivity.READY in connectivities)
     connectivity_channel.unsubscribe(first_callback.update)
     connectivity_channel.unsubscribe(second_callback.update)
 
@@ -142,12 +144,19 @@ class ChannelConnectivityTest(unittest.TestCase):
     server_completion_queue.shutdown()
     server_completion_queue_thread.join()
 
-    self.assertSequenceEqual((_IDLE,), first_connectivities)
-    self.assertSequenceEqual((_IDLE,), second_connectivities)
-    self.assertNotIn(_TRANSIENT_FAILURE, third_connectivities)
-    self.assertNotIn(_FATAL_FAILURE, third_connectivities)
-    self.assertNotIn(_TRANSIENT_FAILURE, fourth_connectivities)
-    self.assertNotIn(_FATAL_FAILURE, fourth_connectivities)
+    self.assertSequenceEqual(
+        (interfaces.ChannelConnectivity.IDLE,), first_connectivities)
+    self.assertSequenceEqual(
+        (interfaces.ChannelConnectivity.IDLE,), second_connectivities)
+    self.assertNotIn(
+        interfaces.ChannelConnectivity.TRANSIENT_FAILURE, third_connectivities)
+    self.assertNotIn(
+        interfaces.ChannelConnectivity.FATAL_FAILURE, third_connectivities)
+    self.assertNotIn(
+        interfaces.ChannelConnectivity.TRANSIENT_FAILURE,
+        fourth_connectivities)
+    self.assertNotIn(
+        interfaces.ChannelConnectivity.FATAL_FAILURE, fourth_connectivities)
 
   def test_reachable_then_unreachable_channel_connectivity(self):
     server_completion_queue = _low.CompletionQueue()
@@ -161,14 +170,16 @@ class ChannelConnectivityTest(unittest.TestCase):
     callback = _Callback()
 
     connectivity_channel = _connectivity_channel.ConnectivityChannel(
-        low_channel, _MAPPING)
+        low_channel)
     connectivity_channel.subscribe(callback.update, try_to_connect=True)
     callback.block_until_connectivities_satisfy(
-        lambda connectivities: _READY in connectivities)
+        lambda connectivities:
+        interfaces.ChannelConnectivity.READY in connectivities)
     # Now take down the server and confirm that channel readiness is repudiated.
     server.shutdown()
     callback.block_until_connectivities_satisfy(
-        lambda connectivities: connectivities[-1] is not _READY)
+        lambda connectivities:
+        connectivities[-1] is not interfaces.ChannelConnectivity.READY)
     connectivity_channel.unsubscribe(callback.update)
 
     server.shutdown()
diff --git a/src/python/grpcio_test/grpc_test/beta/_face_interface_test.py b/src/python/grpcio_test/grpc_test/beta/_face_interface_test.py
index e9087a7949..aa33e1e6f8 100644
--- a/src/python/grpcio_test/grpc_test/beta/_face_interface_test.py
+++ b/src/python/grpcio_test/grpc_test/beta/_face_interface_test.py
@@ -32,7 +32,7 @@
 import collections
 import unittest
 
-from grpc.beta import beta
+from grpc.beta import implementations
 from grpc.beta import interfaces
 from grpc_test import resources
 from grpc_test import test_common as grpc_test_common
@@ -81,25 +81,26 @@ class _Implementation(test_interfaces.Implementation):
         method: method_object.cardinality()
         for (group, method), method_object in methods.iteritems()}
 
-    server_options = beta.server_options(
+    server_options = implementations.server_options(
         request_deserializers=serialization_behaviors.request_deserializers,
         response_serializers=serialization_behaviors.response_serializers,
         thread_pool_size=test_constants.POOL_SIZE)
-    server = beta.server(method_implementations, options=server_options)
-    server_credentials = beta.ssl_server_credentials(
+    server = implementations.server(
+        method_implementations, options=server_options)
+    server_credentials = implementations.ssl_server_credentials(
         [(resources.private_key(), resources.certificate_chain(),),])
     port = server.add_secure_port('[::]:0', server_credentials)
     server.start()
-    client_credentials = beta.ssl_client_credentials(
+    client_credentials = implementations.ssl_client_credentials(
         resources.test_root_certificates(), None, None)
-    channel = test_utilities.create_not_really_secure_channel(
+    channel = test_utilities.not_really_secure_channel(
         'localhost', port, client_credentials, _SERVER_HOST_OVERRIDE)
-    stub_options = beta.stub_options(
+    stub_options = implementations.stub_options(
         request_serializers=serialization_behaviors.request_serializers,
         response_deserializers=serialization_behaviors.response_deserializers,
         thread_pool_size=test_constants.POOL_SIZE)
-    generic_stub = beta.generic_stub(channel, options=stub_options)
-    dynamic_stub = beta.dynamic_stub(
+    generic_stub = implementations.generic_stub(channel, options=stub_options)
+    dynamic_stub = implementations.dynamic_stub(
         channel, service, cardinalities, options=stub_options)
     return generic_stub, {service: dynamic_stub}, server
 
diff --git a/src/python/grpcio_test/grpc_test/beta/_not_found_test.py b/src/python/grpcio_test/grpc_test/beta/_not_found_test.py
index ecd10f2175..5feb997fef 100644
--- a/src/python/grpcio_test/grpc_test/beta/_not_found_test.py
+++ b/src/python/grpcio_test/grpc_test/beta/_not_found_test.py
@@ -31,7 +31,7 @@
 
 import unittest
 
-from grpc.beta import beta
+from grpc.beta import implementations
 from grpc.beta import interfaces
 from grpc.framework.interfaces.face import face
 from grpc_test.framework.common import test_constants
@@ -40,10 +40,10 @@ from grpc_test.framework.common import test_constants
 class NotFoundTest(unittest.TestCase):
 
   def setUp(self):
-    self._server = beta.server({})
+    self._server = implementations.server({})
     port = self._server.add_insecure_port('[::]:0')
-    channel = beta.create_insecure_channel('localhost', port)
-    self._generic_stub = beta.generic_stub(channel)
+    channel = implementations.insecure_channel('localhost', port)
+    self._generic_stub = implementations.generic_stub(channel)
     self._server.start()
 
   def tearDown(self):
diff --git a/src/python/grpcio_test/grpc_test/beta/_utilities_test.py b/src/python/grpcio_test/grpc_test/beta/_utilities_test.py
index 998e74ccf4..996cea9118 100644
--- a/src/python/grpcio_test/grpc_test/beta/_utilities_test.py
+++ b/src/python/grpcio_test/grpc_test/beta/_utilities_test.py
@@ -35,7 +35,7 @@ import unittest
 
 from grpc._adapter import _low
 from grpc._adapter import _types
-from grpc.beta import beta
+from grpc.beta import implementations
 from grpc.beta import utilities
 from grpc.framework.foundation import future
 from grpc_test.framework.common import test_constants
@@ -69,7 +69,7 @@ class _Callback(object):
 class ChannelConnectivityTest(unittest.TestCase):
 
   def test_lonely_channel_connectivity(self):
-    channel = beta.create_insecure_channel('localhost', 12345)
+    channel = implementations.insecure_channel('localhost', 12345)
     callback = _Callback()
 
     ready_future = utilities.channel_ready_future(channel)
@@ -94,7 +94,7 @@ class ChannelConnectivityTest(unittest.TestCase):
     server_completion_queue_thread = threading.Thread(
         target=_drive_completion_queue, args=(server_completion_queue,))
     server_completion_queue_thread.start()
-    channel = beta.create_insecure_channel('localhost', port)
+    channel = implementations.insecure_channel('localhost', port)
     callback = _Callback()
 
     try:
diff --git a/src/python/grpcio_test/grpc_test/beta/test_utilities.py b/src/python/grpcio_test/grpc_test/beta/test_utilities.py
index 338670478d..24a8600e12 100644
--- a/src/python/grpcio_test/grpc_test/beta/test_utilities.py
+++ b/src/python/grpcio_test/grpc_test/beta/test_utilities.py
@@ -30,25 +30,27 @@
 """Test-appropriate entry points into the gRPC Python Beta API."""
 
 from grpc._adapter import _intermediary_low
-from grpc.beta import beta
+from grpc.beta import implementations
 
 
-def create_not_really_secure_channel(
+def not_really_secure_channel(
     host, port, client_credentials, server_host_override):
   """Creates an insecure Channel to a remote host.
 
   Args:
     host: The name of the remote host to which to connect.
     port: The port of the remote host to which to connect.
-    client_credentials: The beta.ClientCredentials with which to connect.
+    client_credentials: The implementations.ClientCredentials with which to
+      connect.
     server_host_override: The target name used for SSL host name checking.
 
   Returns:
-    A beta.Channel to the remote host through which RPCs may be conducted.
+    An implementations.Channel to the remote host through which RPCs may be
+      conducted.
   """
   hostport = '%s:%d' % (host, port)
   intermediary_low_channel = _intermediary_low.Channel(
       hostport, client_credentials._intermediary_low_credentials,
       server_host_override=server_host_override)
-  return beta.Channel(
+  return implementations.Channel(
       intermediary_low_channel._internal, intermediary_low_channel)
diff --git a/src/python/grpcio_test/grpc_test/framework/interfaces/base/test_cases.py b/src/python/grpcio_test/grpc_test/framework/interfaces/base/test_cases.py
index 5065a3f38a..ddda1018c3 100644
--- a/src/python/grpcio_test/grpc_test/framework/interfaces/base/test_cases.py
+++ b/src/python/grpcio_test/grpc_test/framework/interfaces/base/test_cases.py
@@ -119,6 +119,17 @@ class _Operator(base.Operator):
           'Deliberately raised exception from Operator.advance (in a test)!')
 
 
+class _ProtocolReceiver(base.ProtocolReceiver):
+
+  def __init__(self):
+    self._condition = threading.Condition()
+    self._contexts = []
+
+  def context(self, protocol_context):
+    with self._condition:
+      self._contexts.append(protocol_context)
+
+
 class _Servicer(base.Servicer):
   """A base.Servicer with instrumented for testing."""
 
@@ -144,7 +155,7 @@ class _Servicer(base.Servicer):
             controller.service_on_termination)
         if outcome is not None:
           controller.service_on_termination(outcome)
-        return utilities.full_subscription(operator)
+        return utilities.full_subscription(operator, _ProtocolReceiver())
 
 
 class _OperationTest(unittest.TestCase):
@@ -169,7 +180,8 @@ class _OperationTest(unittest.TestCase):
       test_operator = _Operator(
           self._controller, self._controller.on_invocation_advance,
           self._pool, None)
-      subscription = utilities.full_subscription(test_operator)
+      subscription = utilities.full_subscription(
+          test_operator, _ProtocolReceiver())
     else:
       # TODO(nathaniel): support and test other subscription kinds.
       self.fail('Non-full subscriptions not yet supported!')
diff --git a/src/python/grpcio_test/requirements.txt b/src/python/grpcio_test/requirements.txt
index 856198def5..fea80ca07f 100644
--- a/src/python/grpcio_test/requirements.txt
+++ b/src/python/grpcio_test/requirements.txt
@@ -1,5 +1,6 @@
+grpcio>=0.11.0b0
+oauth2client>=1.4.7
+protobuf>=3.0.0a3
 pytest>=2.6
 pytest-cov>=2.0
 pytest-xdist>=1.11
-oauth2client>=1.4.7
-grpcio>=0.10.0a0
diff --git a/src/python/grpcio_test/setup.py b/src/python/grpcio_test/setup.py
index 802dd1e53a..216119f0e7 100644
--- a/src/python/grpcio_test/setup.py
+++ b/src/python/grpcio_test/setup.py
@@ -71,7 +71,7 @@ _SETUP_REQUIRES = (
 
 _INSTALL_REQUIRES = (
     'oauth2client>=1.4.7',
-    'grpcio>=0.10.0a0',
+    'grpcio>=0.11.0b0',
 )
 
 _COMMAND_CLASS = {
@@ -80,7 +80,7 @@ _COMMAND_CLASS = {
 
 setuptools.setup(
     name='grpcio_test',
-    version='0.10.0a0',
+    version='0.11.0b0',
     packages=_PACKAGES,
     package_dir=_PACKAGE_DIRECTORIES,
     package_data=_PACKAGE_DATA,
diff --git a/src/ruby/README.md b/src/ruby/README.md
index 7f75c0e313..8c56ceb135 100644
--- a/src/ruby/README.md
+++ b/src/ruby/README.md
@@ -19,10 +19,10 @@ INSTALLATION
 
 **Linux (Debian):**
 
-Add [Debian testing][] to your `sources.list` file. Example:
+Add [Debian jessie-backports][] to your `sources.list` file. Example:
 
 ```sh
-echo "deb http://ftp.us.debian.org/debian testing main contrib non-free" | \
+echo "deb http://http.debian.net/debian jessie-backports main" | \
 sudo tee -a /etc/apt/sources.list
 ```
 
@@ -99,4 +99,4 @@ Directory structure is the layout for [ruby extensions][]
 [ruby extensions]:http://guides.rubygems.org/gems-with-extensions/
 [rubydoc]: http://www.rubydoc.info/gems/grpc
 [grpc.io]: http://www.grpc.io/docs/installation/ruby.html
-[Debian testing]:https://www.debian.org/releases/stretch/
+[Debian jessie-backports]:http://backports.debian.org/Instructions/
diff --git a/templates/Makefile.template b/templates/Makefile.template
index 6069d6d238..d8370ce268 100644
--- a/templates/Makefile.template
+++ b/templates/Makefile.template
@@ -161,7 +161,7 @@
   CXX_tsan = clang++
   LD_tsan = clang
   LDXX_tsan = clang++
-  CPPFLAGS_tsan = -O0 -fsanitize=thread -fno-omit-frame-pointer -Wno-error=unused-command-line-argument
+  CPPFLAGS_tsan = -O0 -fsanitize=thread -fno-omit-frame-pointer -Wno-unused-command-line-argument
   LDFLAGS_tsan = -fsanitize=thread
   DEFINES_tsan = NDEBUG GRPC_TEST_SLOWDOWN_BUILD_FACTOR=10
 
@@ -171,7 +171,7 @@
   CXX_asan = clang++
   LD_asan = clang
   LDXX_asan = clang++
-  CPPFLAGS_asan = -O0 -fsanitize=address -fno-omit-frame-pointer -Wno-error=unused-command-line-argument
+  CPPFLAGS_asan = -O0 -fsanitize=address -fno-omit-frame-pointer -Wno-unused-command-line-argument
   LDFLAGS_asan = -fsanitize=address
   DEFINES_asan = GRPC_TEST_SLOWDOWN_BUILD_FACTOR=3
 
@@ -181,7 +181,7 @@
   CXX_msan = clang++-libc++
   LD_msan = clang
   LDXX_msan = clang++-libc++
-  CPPFLAGS_msan = -O0 -fsanitize=memory -fsanitize-memory-track-origins -fno-omit-frame-pointer -DGTEST_HAS_TR1_TUPLE=0 -DGTEST_USE_OWN_TR1_TUPLE=1 -Wno-error=unused-command-line-argument
+  CPPFLAGS_msan = -O0 -fsanitize=memory -fsanitize-memory-track-origins -fno-omit-frame-pointer -DGTEST_HAS_TR1_TUPLE=0 -DGTEST_USE_OWN_TR1_TUPLE=1 -Wno-unused-command-line-argument
   OPENSSL_CFLAGS_msan = -DPURIFY
   LDFLAGS_msan = -fsanitize=memory -DGTEST_HAS_TR1_TUPLE=0 -DGTEST_USE_OWN_TR1_TUPLE=1
   DEFINES_msan = NDEBUG GRPC_TEST_SLOWDOWN_BUILD_FACTOR=4
@@ -192,7 +192,7 @@
   CXX_ubsan = clang++
   LD_ubsan = clang
   LDXX_ubsan = clang++
-  CPPFLAGS_ubsan = -O1 -fsanitize=undefined -fno-omit-frame-pointer -Wno-error=unused-command-line-argument
+  CPPFLAGS_ubsan = -O1 -fsanitize=undefined -fno-omit-frame-pointer -Wno-unused-command-line-argument
   OPENSSL_CFLAGS_ubsan = -DPURIFY
   LDFLAGS_ubsan = -fsanitize=undefined
   DEFINES_ubsan = NDEBUG GRPC_TEST_SLOWDOWN_BUILD_FACTOR=3
@@ -261,7 +261,7 @@
   DEFINES += $(EXTRA_DEFINES)
   endif
 
-  CFLAGS += -std=c89 -pedantic
+  CFLAGS += -std=c89 -pedantic -Wsign-conversion -Wconversion
   ifeq ($(HAS_CXX11),true)
   CXXFLAGS += -std=c++11
   else
diff --git a/test/build/empty.c b/test/build/empty.c
new file mode 100644
index 0000000000..58e4698aee
--- /dev/null
+++ b/test/build/empty.c
@@ -0,0 +1,34 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+int main(void) {}
diff --git a/test/core/bad_client/bad_client.c b/test/core/bad_client/bad_client.c
index 1d98879662..41ac83b7b7 100644
--- a/test/core/bad_client/bad_client.c
+++ b/test/core/bad_client/bad_client.c
@@ -145,6 +145,7 @@ void grpc_run_bad_client_test(grpc_bad_client_server_side_validator validator,
       gpr_event_wait(&a.done_write, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5)));
 
   if (flags & GRPC_BAD_CLIENT_DISCONNECT) {
+    grpc_endpoint_shutdown(sfd.client);
     grpc_endpoint_destroy(sfd.client);
     sfd.client = NULL;
   }
@@ -153,6 +154,7 @@ void grpc_run_bad_client_test(grpc_bad_client_server_side_validator validator,
 
   /* Shutdown */
   if (sfd.client) {
+    grpc_endpoint_shutdown(sfd.client);
     grpc_endpoint_destroy(sfd.client);
   }
   grpc_server_shutdown_and_notify(a.server, a.cq, NULL);
diff --git a/test/core/channel/channel_args_test.c b/test/core/channel/channel_args_test.c
index 87f006acde..0b74dee41e 100644
--- a/test/core/channel/channel_args_test.c
+++ b/test/core/channel/channel_args_test.c
@@ -85,12 +85,13 @@ static void test_set_compression_algorithm(void) {
 
 static void test_compression_algorithm_states(void) {
   grpc_channel_args *ch_args, *ch_args_wo_gzip, *ch_args_wo_gzip_deflate;
-  int states_bitset;
+  unsigned states_bitset;
   size_t i;
 
   ch_args = grpc_channel_args_copy_and_add(NULL, NULL, 0);
   /* by default, all enabled */
-  states_bitset = grpc_channel_args_compression_algorithm_get_states(ch_args);
+  states_bitset =
+      (unsigned)grpc_channel_args_compression_algorithm_get_states(ch_args);
 
   for (i = 0; i < GRPC_COMPRESS_ALGORITHMS_COUNT; i++) {
     GPR_ASSERT(GPR_BITGET(states_bitset, i));
@@ -104,7 +105,7 @@ static void test_compression_algorithm_states(void) {
       &ch_args_wo_gzip, GRPC_COMPRESS_DEFLATE, 0);
   GPR_ASSERT(ch_args_wo_gzip == ch_args_wo_gzip_deflate);
 
-  states_bitset = grpc_channel_args_compression_algorithm_get_states(
+  states_bitset = (unsigned)grpc_channel_args_compression_algorithm_get_states(
       ch_args_wo_gzip_deflate);
   for (i = 0; i < GRPC_COMPRESS_ALGORITHMS_COUNT; i++) {
     if (i == GRPC_COMPRESS_GZIP || i == GRPC_COMPRESS_DEFLATE) {
@@ -119,8 +120,8 @@ static void test_compression_algorithm_states(void) {
       &ch_args_wo_gzip_deflate, GRPC_COMPRESS_GZIP, 1);
   GPR_ASSERT(ch_args_wo_gzip == ch_args_wo_gzip_deflate);
 
-  states_bitset =
-      grpc_channel_args_compression_algorithm_get_states(ch_args_wo_gzip);
+  states_bitset = (unsigned)grpc_channel_args_compression_algorithm_get_states(
+      ch_args_wo_gzip);
   for (i = 0; i < GRPC_COMPRESS_ALGORITHMS_COUNT; i++) {
     if (i == GRPC_COMPRESS_DEFLATE) {
       GPR_ASSERT(GPR_BITGET(states_bitset, i) == 0);
diff --git a/test/core/client_config/lb_policies_test.c b/test/core/client_config/lb_policies_test.c
index 18c675b9eb..eec0778cfe 100644
--- a/test/core/client_config/lb_policies_test.c
+++ b/test/core/client_config/lb_policies_test.c
@@ -86,15 +86,15 @@ static void test_spec_reset(test_spec *spec) {
   }
 }
 
-static test_spec *test_spec_create(size_t num_iters, int num_servers) {
+static test_spec *test_spec_create(size_t num_iters, size_t num_servers) {
   test_spec *spec;
   size_t i;
 
   spec = gpr_malloc(sizeof(test_spec));
   spec->num_iters = num_iters;
   spec->num_servers = num_servers;
-  spec->kill_at = gpr_malloc(sizeof(int*) * num_iters);
-  spec->revive_at = gpr_malloc(sizeof(int*) * num_iters);
+  spec->kill_at = gpr_malloc(sizeof(int *) * num_iters);
+  spec->revive_at = gpr_malloc(sizeof(int *) * num_iters);
   for (i = 0; i < num_iters; i++) {
     spec->kill_at[i] = gpr_malloc(sizeof(int) * num_servers);
     spec->revive_at[i] = gpr_malloc(sizeof(int) * num_servers);
@@ -130,19 +130,18 @@ static void drain_cq(grpc_completion_queue *cq) {
   } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
-static void kill_server(const servers_fixture *f, int i) {
+static void kill_server(const servers_fixture *f, size_t i) {
   gpr_log(GPR_INFO, "KILLING SERVER %d", i);
   GPR_ASSERT(f->servers[i] != NULL);
   grpc_server_shutdown_and_notify(f->servers[i], f->cq, tag(10000));
-  GPR_ASSERT(grpc_completion_queue_pluck(f->cq, tag(10000),
-                                         GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5),
-                                         NULL)
+  GPR_ASSERT(grpc_completion_queue_pluck(
+                 f->cq, tag(10000), GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5), NULL)
                  .type == GRPC_OP_COMPLETE);
   grpc_server_destroy(f->servers[i]);
   f->servers[i] = NULL;
 }
 
-static void revive_server(const servers_fixture *f, int i) {
+static void revive_server(const servers_fixture *f, size_t i) {
   int got_port;
   gpr_log(GPR_INFO, "RAISE AGAIN SERVER %d", i);
   GPR_ASSERT(f->servers[i] == NULL);
@@ -161,12 +160,13 @@ static servers_fixture *setup_servers(const char *server_host,
   size_t i;
 
   f->num_servers = num_servers;
-  f->server_calls = gpr_malloc(sizeof(grpc_call*) * num_servers);
-  f->request_metadata_recv = gpr_malloc(sizeof(grpc_metadata_array) * num_servers);
+  f->server_calls = gpr_malloc(sizeof(grpc_call *) * num_servers);
+  f->request_metadata_recv =
+      gpr_malloc(sizeof(grpc_metadata_array) * num_servers);
   /* Create servers. */
-  ports = gpr_malloc(sizeof(int*) * num_servers);
-  f->servers = gpr_malloc(sizeof(grpc_server*) * num_servers);
-  f->servers_hostports = gpr_malloc(sizeof(char*) * num_servers);
+  ports = gpr_malloc(sizeof(int *) * num_servers);
+  f->servers = gpr_malloc(sizeof(grpc_server *) * num_servers);
+  f->servers_hostports = gpr_malloc(sizeof(char *) * num_servers);
   f->cq = grpc_completion_queue_create(NULL);
   for (i = 0; i < num_servers; i++) {
     ports[i] = grpc_pick_unused_port_or_die();
@@ -190,9 +190,8 @@ static void teardown_servers(servers_fixture *f) {
   for (i = 0; i < f->num_servers; i++) {
     if (f->servers[i] == NULL) continue;
     grpc_server_shutdown_and_notify(f->servers[i], f->cq, tag(10000));
-    GPR_ASSERT(grpc_completion_queue_pluck(f->cq, tag(10000),
-                                           GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5),
-                                           NULL)
+    GPR_ASSERT(grpc_completion_queue_pluck(
+                   f->cq, tag(10000), GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5), NULL)
                    .type == GRPC_OP_COMPLETE);
     grpc_server_destroy(f->servers[i]);
   }
@@ -234,7 +233,7 @@ int *perform_request(servers_fixture *f, grpc_channel *client,
   grpc_metadata_array trailing_metadata_recv;
 
   s_valid = gpr_malloc(sizeof(int) * f->num_servers);
-  call_details  = gpr_malloc(sizeof(grpc_call_details) * f->num_servers);
+  call_details = gpr_malloc(sizeof(grpc_call_details) * f->num_servers);
   connection_sequence = gpr_malloc(sizeof(int) * spec->num_iters);
 
   /* Send a trivial request. */
@@ -292,16 +291,17 @@ int *perform_request(servers_fixture *f, grpc_channel *client,
     op->reserved = NULL;
     op++;
     GPR_ASSERT(GRPC_CALL_OK ==
-               grpc_call_start_batch(c, ops, op - ops, tag(1), NULL));
+               grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL));
 
     /* "listen" on all servers */
     for (i = 0; i < f->num_servers; i++) {
       grpc_metadata_array_init(&f->request_metadata_recv[i]);
       if (f->servers[i] != NULL) {
-        GPR_ASSERT(GRPC_CALL_OK == grpc_server_request_call(
-                                       f->servers[i], &f->server_calls[i],
-                                       &call_details[i], &f->request_metadata_recv[i],
-                                       f->cq, f->cq, tag(1000 + i)));
+        GPR_ASSERT(GRPC_CALL_OK ==
+                   grpc_server_request_call(f->servers[i], &f->server_calls[i],
+                                            &call_details[i],
+                                            &f->request_metadata_recv[i], f->cq,
+                                            f->cq, tag(1000 + (int)i)));
       }
     }
 
@@ -341,14 +341,13 @@ int *perform_request(servers_fixture *f, grpc_channel *client,
       op->reserved = NULL;
       op++;
       GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(f->server_calls[s_idx],
-                                                       ops, op - ops, tag(102),
-                                                       NULL));
+                                                       ops, (size_t)(op - ops),
+                                                       tag(102), NULL));
 
       cq_expect_completion(cqv, tag(102), 1);
       cq_expect_completion(cqv, tag(1), 1);
       cq_verify(cqv);
 
-
       GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
       GPR_ASSERT(0 == strcmp(details, "xyz"));
       GPR_ASSERT(0 == strcmp(call_details[s_idx].method, "/foo"));
@@ -357,7 +356,7 @@ int *perform_request(servers_fixture *f, grpc_channel *client,
     }
 
     for (i = 0; i < f->num_servers; i++) {
-      if (s_valid[i] != 0){
+      if (s_valid[i] != 0) {
         grpc_call_destroy(f->server_calls[i]);
       }
       grpc_metadata_array_destroy(&f->request_metadata_recv[i]);
@@ -404,7 +403,8 @@ static void assert_channel_connectivity(
   }
   va_end(ap);
   if (i == num_accepted_conn_states) {
-    char **accepted_strs = gpr_malloc(sizeof(char*) * num_accepted_conn_states);
+    char **accepted_strs =
+        gpr_malloc(sizeof(char *) * num_accepted_conn_states);
     char *accepted_str_joined;
     va_start(ap, accepted_conn_states);
     for (i = 0; i < num_accepted_conn_states; i++) {
@@ -476,7 +476,7 @@ static void verify_vanilla_round_robin(const servers_fixture *f,
                                        const size_t num_iters) {
   int *expected_connection_sequence;
   size_t i;
-  const int expected_seq_length = f->num_servers;
+  const size_t expected_seq_length = f->num_servers;
 
   /* verify conn. seq. expectation */
   /* get the first sequence of "num_servers" elements */
@@ -507,7 +507,7 @@ static void verify_vanishing_floor_round_robin(
     const servers_fixture *f, grpc_channel *client,
     const int *actual_connection_sequence, const size_t num_iters) {
   int *expected_connection_sequence;
-  const int expected_seq_length = 2;
+  const size_t expected_seq_length = 2;
   size_t i;
 
   /* verify conn. seq. expectation */
@@ -522,13 +522,12 @@ static void verify_vanishing_floor_round_robin(
             expected_connection_sequence[0], actual_connection_sequence[0], 0);
     print_failed_expectations(expected_connection_sequence,
                               actual_connection_sequence, expected_seq_length,
-                              1);
+                              1u);
     abort();
   }
 
   GPR_ASSERT(actual_connection_sequence[1] == -1);
 
-
   for (i = 2; i < num_iters; i++) {
     const int actual = actual_connection_sequence[i];
     const int expected = expected_connection_sequence[i % expected_seq_length];
@@ -570,7 +569,7 @@ static void verify_partial_carnage_round_robin(
     const int *actual_connection_sequence, const size_t num_iters) {
   int *expected_connection_sequence;
   size_t i;
-  const int expected_seq_length = f->num_servers;
+  const size_t expected_seq_length = f->num_servers;
 
   /* verify conn. seq. expectation */
   /* get the first sequence of "num_servers" elements */
@@ -578,7 +577,7 @@ static void verify_partial_carnage_round_robin(
   memcpy(expected_connection_sequence, actual_connection_sequence,
          sizeof(int) * expected_seq_length);
 
-  for (i = 0; i < num_iters/2; i++) {
+  for (i = 0; i < num_iters / 2; i++) {
     const int actual = actual_connection_sequence[i];
     const int expected = expected_connection_sequence[i % expected_seq_length];
     if (actual != expected) {
@@ -609,7 +608,7 @@ static void verify_rebirth_round_robin(const servers_fixture *f,
                                        const size_t num_iters) {
   int *expected_connection_sequence;
   size_t i;
-  const int expected_seq_length = f->num_servers;
+  const size_t expected_seq_length = f->num_servers;
 
   /* verify conn. seq. expectation */
   /* get the first sequence of "num_servers" elements */
@@ -643,7 +642,6 @@ static void verify_rebirth_round_robin(const servers_fixture *f,
   gpr_free(expected_connection_sequence);
 }
 
-
 int main(int argc, char **argv) {
   test_spec *spec;
   size_t i;
@@ -657,7 +655,7 @@ int main(int argc, char **argv) {
   spec = test_spec_create(NUM_ITERS, NUM_SERVERS);
   spec->verifier = verify_vanilla_round_robin;
   spec->description = "test_all_server_up";
-  /*run_spec(spec);*/
+  run_spec(spec);
 
   /* Kill all servers first thing in the morning */
   test_spec_reset(spec);
@@ -676,7 +674,7 @@ int main(int argc, char **argv) {
   for (i = 1; i < NUM_SERVERS - 1; i++) {
     spec->kill_at[1][i] = 1;
   }
-  /*run_spec(spec);*/
+  run_spec(spec);
 
   /* Midway, kill all servers. */
   test_spec_reset(spec);
@@ -685,7 +683,7 @@ int main(int argc, char **argv) {
   for (i = 0; i < NUM_SERVERS; i++) {
     spec->kill_at[spec->num_iters / 2][i] = 1;
   }
-  /*run_spec(spec);*/
+  run_spec(spec);
 
   /* After first iteration, kill all servers. On the third one, bring them all
    * back up. */
@@ -696,7 +694,7 @@ int main(int argc, char **argv) {
     spec->kill_at[1][i] = 1;
     spec->revive_at[3][i] = 1;
   }
-  /*run_spec(spec);*/
+  run_spec(spec);
 
   test_spec_destroy(spec);
 
diff --git a/test/core/compression/message_compress_test.c b/test/core/compression/message_compress_test.c
index 495841c79f..98da6a1eaa 100644
--- a/test/core/compression/message_compress_test.c
+++ b/test/core/compression/message_compress_test.c
@@ -149,7 +149,7 @@ static gpr_slice create_test_value(test_value id) {
 static void test_bad_data(void) {
   gpr_slice_buffer input;
   gpr_slice_buffer output;
-  int i;
+  grpc_compression_algorithm i;
 
   gpr_slice_buffer_init(&input);
   gpr_slice_buffer_init(&output);
diff --git a/test/core/end2end/dualstack_socket_test.c b/test/core/end2end/dualstack_socket_test.c
index fcc12952bf..ec3fb65105 100644
--- a/test/core/end2end/dualstack_socket_test.c
+++ b/test/core/end2end/dualstack_socket_test.c
@@ -40,6 +40,7 @@
 #include <grpc/support/string_util.h>
 
 #include "src/core/support/string.h"
+#include "src/core/iomgr/resolve_address.h"
 #include "src/core/iomgr/socket_utils_posix.h"
 
 #include "test/core/end2end/cq_verifier.h"
@@ -186,7 +187,7 @@ void test_connect(const char *server_host, const char *client_host, int port,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   if (expect_ok) {
@@ -212,7 +213,7 @@ void test_connect(const char *server_host, const char *client_host, int port,
     op->data.recv_close_on_server.cancelled = &was_cancelled;
     op->flags = 0;
     op++;
-    error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+    error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
     GPR_ASSERT(GRPC_CALL_OK == error);
 
     cq_expect_completion(cqv, tag(102), 1);
@@ -263,6 +264,15 @@ void test_connect(const char *server_host, const char *client_host, int port,
   gpr_free(details);
 }
 
+int external_dns_works(const char *host) {
+  grpc_resolved_addresses *res = grpc_blocking_resolve_address(host, "80");
+  if (res != NULL) {
+    gpr_free(res);
+    return 1;
+  }
+  return 0;
+}
+
 int main(int argc, char **argv) {
   int do_ipv6 = 1;
 
@@ -308,6 +318,25 @@ int main(int argc, char **argv) {
       test_connect("::1", "ipv4:127.0.0.1", 0, 0);
       test_connect("127.0.0.1", "ipv6:[::1]", 0, 0);
     }
+
+    if (!external_dns_works("loopback46.unittest.grpc.io")) {
+      gpr_log(GPR_INFO, "Skipping tests that depend on *.unittest.grpc.io.");
+    } else {
+      test_connect("loopback46.unittest.grpc.io",
+                   "loopback4.unittest.grpc.io", 0, 1);
+      test_connect("loopback4.unittest.grpc.io",
+                   "loopback46.unittest.grpc.io", 0, 1);
+      if (do_ipv6) {
+        test_connect("loopback46.unittest.grpc.io",
+                     "loopback6.unittest.grpc.io", 0, 1);
+        test_connect("loopback6.unittest.grpc.io",
+                     "loopback46.unittest.grpc.io", 0, 1);
+        test_connect("loopback4.unittest.grpc.io",
+                     "loopback6.unittest.grpc.io", 0, 0);
+        test_connect("loopback6.unittest.grpc.io",
+                     "loopback4.unittest.grpc.io", 0, 0);
+      }
+    }
   }
 
   grpc_shutdown();
diff --git a/test/core/end2end/no_server_test.c b/test/core/end2end/no_server_test.c
index 619627ddd2..c391003141 100644
--- a/test/core/end2end/no_server_test.c
+++ b/test/core/end2end/no_server_test.c
@@ -79,8 +79,8 @@ int main(int argc, char **argv) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  GPR_ASSERT(GRPC_CALL_OK ==
-             grpc_call_start_batch(call, ops, op - ops, tag(1), NULL));
+  GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(
+                                 call, ops, (size_t)(op - ops), tag(1), NULL));
   /* verify that all tags get completed */
   cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
diff --git a/test/core/end2end/tests/bad_hostname.c b/test/core/end2end/tests/bad_hostname.c
index 8f28fa1e63..93e2df1e43 100644
--- a/test/core/end2end/tests/bad_hostname.c
+++ b/test/core/end2end/tests/bad_hostname.c
@@ -146,7 +146,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(1), 1);
diff --git a/test/core/end2end/tests/binary_metadata.c b/test/core/end2end/tests/binary_metadata.c
index 2345f94044..21e0bbcc49 100644
--- a/test/core/end2end/tests/binary_metadata.c
+++ b/test/core/end2end/tests/binary_metadata.c
@@ -191,7 +191,7 @@ static void test_request_response_with_metadata_and_payload(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -213,7 +213,7 @@ static void test_request_response_with_metadata_and_payload(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -237,7 +237,7 @@ static void test_request_response_with_metadata_and_payload(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(103), 1);
diff --git a/test/core/end2end/tests/call_creds.c b/test/core/end2end/tests/call_creds.c
index 75c5bba5bd..4e905aafc7 100644
--- a/test/core/end2end/tests/call_creds.c
+++ b/test/core/end2end/tests/call_creds.c
@@ -247,7 +247,7 @@ static void request_response_with_payload_and_call_creds(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -280,7 +280,7 @@ static void request_response_with_payload_and_call_creds(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -304,7 +304,7 @@ static void request_response_with_payload_and_call_creds(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(103), 1);
@@ -464,7 +464,7 @@ static void test_request_with_server_rejecting_client_creds(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(error == GRPC_CALL_OK);
 
   cq_expect_completion(cqv, tag(1), 1);
diff --git a/test/core/end2end/tests/cancel_after_accept.c b/test/core/end2end/tests/cancel_after_accept.c
index 313e0b05bd..10e62275ab 100644
--- a/test/core/end2end/tests/cancel_after_accept.c
+++ b/test/core/end2end/tests/cancel_after_accept.c
@@ -165,7 +165,7 @@ static void test_cancel_after_accept(grpc_end2end_test_config config,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error = grpc_server_request_call(f.server, &s, &call_details,
@@ -195,7 +195,7 @@ static void test_cancel_after_accept(grpc_end2end_test_config config,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(3), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(3), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   GPR_ASSERT(GRPC_CALL_OK == mode.initiate_cancel(c, NULL));
diff --git a/test/core/end2end/tests/cancel_after_client_done.c b/test/core/end2end/tests/cancel_after_client_done.c
index 2430a6d218..4fed5be5f7 100644
--- a/test/core/end2end/tests/cancel_after_client_done.c
+++ b/test/core/end2end/tests/cancel_after_client_done.c
@@ -169,7 +169,7 @@ static void test_cancel_after_accept_and_writes_closed(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error = grpc_server_request_call(f.server, &s, &call_details,
@@ -199,7 +199,7 @@ static void test_cancel_after_accept_and_writes_closed(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(3), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(3), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   GPR_ASSERT(GRPC_CALL_OK == mode.initiate_cancel(c, NULL));
diff --git a/test/core/end2end/tests/cancel_after_invoke.c b/test/core/end2end/tests/cancel_after_invoke.c
index 9991ee02f0..40595e4c7b 100644
--- a/test/core/end2end/tests/cancel_after_invoke.c
+++ b/test/core/end2end/tests/cancel_after_invoke.c
@@ -101,7 +101,7 @@ static void end_test(grpc_end2end_test_fixture *f) {
 
 /* Cancel after invoke, no payload */
 static void test_cancel_after_invoke(grpc_end2end_test_config config,
-                                     cancellation_mode mode, int test_ops) {
+                                     cancellation_mode mode, size_t test_ops) {
   grpc_op ops[6];
   grpc_op *op;
   grpc_call *c;
diff --git a/test/core/end2end/tests/cancel_before_invoke.c b/test/core/end2end/tests/cancel_before_invoke.c
index 8b582e0c42..c049e0c2d6 100644
--- a/test/core/end2end/tests/cancel_before_invoke.c
+++ b/test/core/end2end/tests/cancel_before_invoke.c
@@ -99,7 +99,7 @@ static void end_test(grpc_end2end_test_fixture *f) {
 
 /* Cancel before invoke */
 static void test_cancel_before_invoke(grpc_end2end_test_config config,
-                                      int test_ops) {
+                                      size_t test_ops) {
   grpc_op ops[6];
   grpc_op *op;
   grpc_call *c;
@@ -189,7 +189,7 @@ static void test_cancel_before_invoke(grpc_end2end_test_config config,
 }
 
 void grpc_end2end_tests(grpc_end2end_test_config config) {
-  int i;
+  size_t i;
   for (i = 1; i <= 6; i++) {
     test_cancel_before_invoke(config, i);
   }
diff --git a/test/core/end2end/tests/census_simple_request.c b/test/core/end2end/tests/census_simple_request.c
index 36b9e92884..adf855ca60 100644
--- a/test/core/end2end/tests/census_simple_request.c
+++ b/test/core/end2end/tests/census_simple_request.c
@@ -145,7 +145,7 @@ static void test_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -173,7 +173,7 @@ static void test_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/compressed_payload.c b/test/core/end2end/tests/compressed_payload.c
index 299943c548..c50eaba8b2 100644
--- a/test/core/end2end/tests/compressed_payload.c
+++ b/test/core/end2end/tests/compressed_payload.c
@@ -186,7 +186,7 @@ static void request_with_payload_template(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -215,7 +215,7 @@ static void request_with_payload_template(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -234,7 +234,7 @@ static void request_with_payload_template(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(103), 1);
diff --git a/test/core/end2end/tests/default_host.c b/test/core/end2end/tests/default_host.c
index 57f65b834b..7b62505a9a 100644
--- a/test/core/end2end/tests/default_host.c
+++ b/test/core/end2end/tests/default_host.c
@@ -154,7 +154,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(error == GRPC_CALL_OK);
 
   error =
@@ -191,7 +191,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(error == GRPC_CALL_OK);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/disappearing_server.c b/test/core/end2end/tests/disappearing_server.c
index 09762705e3..de3ea16f66 100644
--- a/test/core/end2end/tests/disappearing_server.c
+++ b/test/core/end2end/tests/disappearing_server.c
@@ -131,7 +131,7 @@ static void do_request_and_shutdown_server(grpc_end2end_test_fixture *f,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -163,7 +163,7 @@ static void do_request_and_shutdown_server(grpc_end2end_test_fixture *f,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/graceful_server_shutdown.c b/test/core/end2end/tests/graceful_server_shutdown.c
index d4e7a1ac6d..df420a9846 100644
--- a/test/core/end2end/tests/graceful_server_shutdown.c
+++ b/test/core/end2end/tests/graceful_server_shutdown.c
@@ -146,7 +146,7 @@ static void test_early_server_shutdown_finishes_inflight_calls(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -178,7 +178,7 @@ static void test_early_server_shutdown_finishes_inflight_calls(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/high_initial_seqno.c b/test/core/end2end/tests/high_initial_seqno.c
index 0067bb4bef..44d6a60c10 100644
--- a/test/core/end2end/tests/high_initial_seqno.c
+++ b/test/core/end2end/tests/high_initial_seqno.c
@@ -149,7 +149,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -177,7 +177,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/invoke_large_request.c b/test/core/end2end/tests/invoke_large_request.c
index 7677084511..f79d146da1 100644
--- a/test/core/end2end/tests/invoke_large_request.c
+++ b/test/core/end2end/tests/invoke_large_request.c
@@ -171,7 +171,7 @@ static void test_invoke_large_request(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -192,7 +192,7 @@ static void test_invoke_large_request(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -216,7 +216,7 @@ static void test_invoke_large_request(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(103), 1);
diff --git a/test/core/end2end/tests/large_metadata.c b/test/core/end2end/tests/large_metadata.c
index 98e47aaf98..87529639a7 100644
--- a/test/core/end2end/tests/large_metadata.c
+++ b/test/core/end2end/tests/large_metadata.c
@@ -121,7 +121,7 @@ static void test_request_with_large_metadata(grpc_end2end_test_config config) {
   char *details = NULL;
   size_t details_capacity = 0;
   int was_cancelled = 2;
-  const int large_size = 64 * 1024;
+  const size_t large_size = 64 * 1024;
 
   c = grpc_channel_create_call(f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
                                "/foo", "foo.test.google.fr", deadline, NULL);
@@ -167,7 +167,7 @@ static void test_request_with_large_metadata(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -188,7 +188,7 @@ static void test_request_with_large_metadata(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -207,7 +207,7 @@ static void test_request_with_large_metadata(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(103), 1);
diff --git a/test/core/end2end/tests/max_concurrent_streams.c b/test/core/end2end/tests/max_concurrent_streams.c
index 0ba620b851..87eb4dd451 100644
--- a/test/core/end2end/tests/max_concurrent_streams.c
+++ b/test/core/end2end/tests/max_concurrent_streams.c
@@ -147,7 +147,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -175,7 +175,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -280,7 +280,7 @@ static void test_max_concurrent_streams(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c1, ops, op - ops, tag(301), NULL);
+  error = grpc_call_start_batch(c1, ops, (size_t)(op - ops), tag(301), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   op = ops;
@@ -297,7 +297,7 @@ static void test_max_concurrent_streams(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c1, ops, op - ops, tag(302), NULL);
+  error = grpc_call_start_batch(c1, ops, (size_t)(op - ops), tag(302), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   op = ops;
@@ -310,7 +310,7 @@ static void test_max_concurrent_streams(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c2, ops, op - ops, tag(401), NULL);
+  error = grpc_call_start_batch(c2, ops, (size_t)(op - ops), tag(401), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   op = ops;
@@ -327,7 +327,7 @@ static void test_max_concurrent_streams(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c2, ops, op - ops, tag(402), NULL);
+  error = grpc_call_start_batch(c2, ops, (size_t)(op - ops), tag(402), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   got_client_start = 0;
@@ -372,7 +372,7 @@ static void test_max_concurrent_streams(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s1, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s1, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -406,7 +406,7 @@ static void test_max_concurrent_streams(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s2, ops, op - ops, tag(202), NULL);
+  error = grpc_call_start_batch(s2, ops, (size_t)(op - ops), tag(202), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(live_call + 2), 1);
diff --git a/test/core/end2end/tests/max_message_length.c b/test/core/end2end/tests/max_message_length.c
index 2b9560716f..782b9d0f26 100644
--- a/test/core/end2end/tests/max_message_length.c
+++ b/test/core/end2end/tests/max_message_length.c
@@ -167,7 +167,7 @@ static void test_max_message_length(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -183,7 +183,7 @@ static void test_max_message_length(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/metadata.c b/test/core/end2end/tests/metadata.c
index a4cc27896c..d0604cc6b6 100644
--- a/test/core/end2end/tests/metadata.c
+++ b/test/core/end2end/tests/metadata.c
@@ -175,7 +175,7 @@ static void test_request_response_with_metadata_and_payload(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -197,7 +197,7 @@ static void test_request_response_with_metadata_and_payload(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -221,7 +221,7 @@ static void test_request_response_with_metadata_and_payload(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(103), 1);
diff --git a/test/core/end2end/tests/payload.c b/test/core/end2end/tests/payload.c
index ff00ae6d9d..0b303268fc 100644
--- a/test/core/end2end/tests/payload.c
+++ b/test/core/end2end/tests/payload.c
@@ -164,7 +164,7 @@ static void request_response_with_payload(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -185,7 +185,7 @@ static void request_response_with_payload(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -209,7 +209,7 @@ static void request_response_with_payload(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(103), 1);
diff --git a/test/core/end2end/tests/ping_pong_streaming.c b/test/core/end2end/tests/ping_pong_streaming.c
index 43abda4d7f..39682d8bc5 100644
--- a/test/core/end2end/tests/ping_pong_streaming.c
+++ b/test/core/end2end/tests/ping_pong_streaming.c
@@ -154,7 +154,7 @@ static void test_pingpong_streaming(grpc_end2end_test_config config,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -175,7 +175,7 @@ static void test_pingpong_streaming(grpc_end2end_test_config config,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(101), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(101), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   for (i = 0; i < messages; i++) {
@@ -193,7 +193,7 @@ static void test_pingpong_streaming(grpc_end2end_test_config config,
     op->flags = 0;
     op->reserved = NULL;
     op++;
-    error = grpc_call_start_batch(c, ops, op - ops, tag(2), NULL);
+    error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(2), NULL);
     GPR_ASSERT(GRPC_CALL_OK == error);
 
     op = ops;
@@ -202,7 +202,7 @@ static void test_pingpong_streaming(grpc_end2end_test_config config,
     op->flags = 0;
     op->reserved = NULL;
     op++;
-    error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+    error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
     GPR_ASSERT(GRPC_CALL_OK == error);
     cq_expect_completion(cqv, tag(102), 1);
     cq_verify(cqv);
@@ -213,7 +213,7 @@ static void test_pingpong_streaming(grpc_end2end_test_config config,
     op->flags = 0;
     op->reserved = NULL;
     op++;
-    error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+    error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
     GPR_ASSERT(GRPC_CALL_OK == error);
     cq_expect_completion(cqv, tag(103), 1);
     cq_expect_completion(cqv, tag(2), 1);
@@ -233,7 +233,7 @@ static void test_pingpong_streaming(grpc_end2end_test_config config,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(3), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(3), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   op = ops;
@@ -244,7 +244,7 @@ static void test_pingpong_streaming(grpc_end2end_test_config config,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(104), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(104), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(1), 1);
diff --git a/test/core/end2end/tests/registered_call.c b/test/core/end2end/tests/registered_call.c
index eddce6ded4..b3156e0248 100644
--- a/test/core/end2end/tests/registered_call.c
+++ b/test/core/end2end/tests/registered_call.c
@@ -148,7 +148,7 @@ static void simple_request_body(grpc_end2end_test_fixture f, void *rc) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -176,7 +176,7 @@ static void simple_request_body(grpc_end2end_test_fixture f, void *rc) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/request_with_flags.c b/test/core/end2end/tests/request_with_flags.c
index eb2e5dc7e8..b9cdf5168c 100644
--- a/test/core/end2end/tests/request_with_flags.c
+++ b/test/core/end2end/tests/request_with_flags.c
@@ -160,7 +160,7 @@ static void test_invoke_request_with_flags(
   op->reserved = NULL;
   op++;
   expectation = call_start_batch_expected_result;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(expectation == error);
 
   if (expectation == GRPC_CALL_OK) {
diff --git a/test/core/end2end/tests/request_with_payload.c b/test/core/end2end/tests/request_with_payload.c
index 149dbaeb00..a323b43ab0 100644
--- a/test/core/end2end/tests/request_with_payload.c
+++ b/test/core/end2end/tests/request_with_payload.c
@@ -158,7 +158,7 @@ static void test_invoke_request_with_payload(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   GPR_ASSERT(GRPC_CALL_OK == grpc_server_request_call(
@@ -178,7 +178,7 @@ static void test_invoke_request_with_payload(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -197,7 +197,7 @@ static void test_invoke_request_with_payload(grpc_end2end_test_config config) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(103), 1);
diff --git a/test/core/end2end/tests/server_finishes_request.c b/test/core/end2end/tests/server_finishes_request.c
index 8bacc6c730..bdc18a5e38 100644
--- a/test/core/end2end/tests/server_finishes_request.c
+++ b/test/core/end2end/tests/server_finishes_request.c
@@ -145,7 +145,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -173,7 +173,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/shutdown_finishes_calls.c b/test/core/end2end/tests/shutdown_finishes_calls.c
index 233bc9bee2..ad7def09a9 100644
--- a/test/core/end2end/tests/shutdown_finishes_calls.c
+++ b/test/core/end2end/tests/shutdown_finishes_calls.c
@@ -139,7 +139,7 @@ static void test_early_server_shutdown_finishes_inflight_calls(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -155,7 +155,7 @@ static void test_early_server_shutdown_finishes_inflight_calls(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   /* shutdown and destroy the server */
diff --git a/test/core/end2end/tests/simple_delayed_request.c b/test/core/end2end/tests/simple_delayed_request.c
index 9133aacc35..14e0ac8f66 100644
--- a/test/core/end2end/tests/simple_delayed_request.c
+++ b/test/core/end2end/tests/simple_delayed_request.c
@@ -140,7 +140,7 @@ static void simple_delayed_request_body(grpc_end2end_test_config config,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   config.init_server(f, server_args);
@@ -170,7 +170,7 @@ static void simple_delayed_request_body(grpc_end2end_test_config config,
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/simple_request.c b/test/core/end2end/tests/simple_request.c
index 0f62d958ae..a874640837 100644
--- a/test/core/end2end/tests/simple_request.c
+++ b/test/core/end2end/tests/simple_request.c
@@ -155,7 +155,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -192,7 +192,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
diff --git a/test/core/end2end/tests/trailing_metadata.c b/test/core/end2end/tests/trailing_metadata.c
index 8b764751f6..c040b9fac1 100644
--- a/test/core/end2end/tests/trailing_metadata.c
+++ b/test/core/end2end/tests/trailing_metadata.c
@@ -178,7 +178,7 @@ static void test_request_response_with_metadata_and_payload(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(c, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   error =
@@ -200,7 +200,7 @@ static void test_request_response_with_metadata_and_payload(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(102), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(102), 1);
@@ -225,7 +225,7 @@ static void test_request_response_with_metadata_and_payload(
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(s, ops, op - ops, tag(103), NULL);
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   cq_expect_completion(cqv, tag(103), 1);
diff --git a/test/core/fling/client.c b/test/core/fling/client.c
index 54c9274510..a53411c2f5 100644
--- a/test/core/fling/client.c
+++ b/test/core/fling/client.c
@@ -92,8 +92,9 @@ static void step_ping_pong_request(void) {
   call = grpc_channel_create_call(channel, NULL, GRPC_PROPAGATE_DEFAULTS, cq,
                                   "/Reflector/reflectUnary", "localhost",
                                   gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
-  GPR_ASSERT(GRPC_CALL_OK ==
-             grpc_call_start_batch(call, ops, op - ops, (void *)1, NULL));
+  GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(call, ops,
+                                                   (size_t)(op - ops),
+                                                   (void *)1, NULL));
   grpc_completion_queue_next(cq, gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
   grpc_call_destroy(call);
   grpc_byte_buffer_destroy(response_payload_recv);
@@ -129,7 +130,7 @@ static void step_ping_pong_stream(void) {
 
 static double now(void) {
   gpr_timespec tv = gpr_now(GPR_CLOCK_REALTIME);
-  return 1e9 * tv.tv_sec + tv.tv_nsec;
+  return 1e9 * (double)tv.tv_sec + tv.tv_nsec;
 }
 
 typedef struct {
@@ -188,7 +189,7 @@ int main(int argc, char **argv) {
 
   channel = grpc_insecure_channel_create(target, NULL, NULL);
   cq = grpc_completion_queue_create(NULL);
-  the_buffer = grpc_raw_byte_buffer_create(&slice, payload_size);
+  the_buffer = grpc_raw_byte_buffer_create(&slice, (size_t)payload_size);
   histogram = gpr_histogram_create(0.01, 60e9);
 
   sc.init();
diff --git a/test/core/fling/fling_stream_test.c b/test/core/fling/fling_stream_test.c
index 4d9253c0ad..78a73372aa 100644
--- a/test/core/fling/fling_stream_test.c
+++ b/test/core/fling/fling_stream_test.c
@@ -60,10 +60,10 @@ int main(int argc, char **argv) {
   pid_t svr, cli;
   /* seed rng with pid, so we don't end up with the same random numbers as a
      concurrently running test binary */
-  srand(getpid());
+  srand((unsigned)getpid());
   /* figure out where we are */
   if (lslash) {
-    memcpy(root, me, lslash - me);
+    memcpy(root, me, (size_t)(lslash - me));
     root[lslash - me] = 0;
   } else {
     strcpy(root, ".");
diff --git a/test/core/fling/fling_test.c b/test/core/fling/fling_test.c
index 29d9050704..cf43ecfd2d 100644
--- a/test/core/fling/fling_test.c
+++ b/test/core/fling/fling_test.c
@@ -51,7 +51,7 @@ int main(int argc, char **argv) {
   gpr_subprocess *svr, *cli;
   /* figure out where we are */
   if (lslash) {
-    memcpy(root, me, lslash - me);
+    memcpy(root, me, (size_t)(lslash - me));
     root[lslash - me] = 0;
   } else {
     strcpy(root, ".");
diff --git a/test/core/fling/server.c b/test/core/fling/server.c
index 0430ff9ab7..5aace03520 100644
--- a/test/core/fling/server.c
+++ b/test/core/fling/server.c
@@ -123,7 +123,7 @@ static void handle_unary_method(void) {
   op->data.recv_close_on_server.cancelled = &was_cancelled;
   op++;
 
-  error = grpc_call_start_batch(call, unary_ops, op - unary_ops,
+  error = grpc_call_start_batch(call, unary_ops, (size_t)(op - unary_ops),
                                 tag(FLING_SERVER_BATCH_OPS_FOR_UNARY), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 }
@@ -197,7 +197,7 @@ int main(int argc, char **argv) {
   grpc_test_init(1, fake_argv);
 
   grpc_init();
-  srand(clock());
+  srand((unsigned)clock());
 
   cl = gpr_cmdline_create("fling server");
   gpr_cmdline_add_string(cl, "bind", "Bind host:port", &addr);
diff --git a/test/core/httpcli/httpcli_test.c b/test/core/httpcli/httpcli_test.c
index 42b2661c0a..cf2b10c021 100644
--- a/test/core/httpcli/httpcli_test.c
+++ b/test/core/httpcli/httpcli_test.c
@@ -134,7 +134,7 @@ int main(int argc, char **argv) {
 
   /* figure out where we are */
   if (lslash) {
-    memcpy(root, me, lslash - me);
+    memcpy(root, me, (size_t)(lslash - me));
     root[lslash - me] = 0;
   } else {
     strcpy(root, ".");
diff --git a/test/core/iomgr/alarm_heap_test.c b/test/core/iomgr/alarm_heap_test.c
index 66b6e4cb64..13bf7e43f6 100644
--- a/test/core/iomgr/alarm_heap_test.c
+++ b/test/core/iomgr/alarm_heap_test.c
@@ -48,9 +48,9 @@ static gpr_timespec random_deadline(void) {
   return ts;
 }
 
-static grpc_alarm *create_test_elements(int num_elements) {
+static grpc_alarm *create_test_elements(size_t num_elements) {
   grpc_alarm *elems = gpr_malloc(num_elements * sizeof(grpc_alarm));
-  int i;
+  size_t i;
   for (i = 0; i < num_elements; i++) {
     elems[i].deadline = random_deadline();
   }
@@ -63,24 +63,25 @@ static int cmp_elem(const void *a, const void *b) {
   return i - j;
 }
 
-static int *all_top(grpc_alarm_heap *pq, int *n) {
-  int *vec = NULL;
-  int *need_to_check_children;
-  int num_need_to_check_children = 0;
+static size_t *all_top(grpc_alarm_heap *pq, size_t *n) {
+  size_t *vec = NULL;
+  size_t *need_to_check_children;
+  size_t num_need_to_check_children = 0;
 
   *n = 0;
   if (pq->alarm_count == 0) return vec;
-  need_to_check_children = gpr_malloc(pq->alarm_count * sizeof(int));
+  need_to_check_children =
+      gpr_malloc(pq->alarm_count * sizeof(*need_to_check_children));
   need_to_check_children[num_need_to_check_children++] = 0;
-  vec = gpr_malloc(pq->alarm_count * sizeof(int));
+  vec = gpr_malloc(pq->alarm_count * sizeof(*vec));
   while (num_need_to_check_children > 0) {
-    int ind = need_to_check_children[0];
-    int leftchild, rightchild;
+    size_t ind = need_to_check_children[0];
+    size_t leftchild, rightchild;
     num_need_to_check_children--;
     memmove(need_to_check_children, need_to_check_children + 1,
-            num_need_to_check_children * sizeof(int));
+            num_need_to_check_children * sizeof(*need_to_check_children));
     vec[(*n)++] = ind;
-    leftchild = 1 + 2 * ind;
+    leftchild = 1u + 2u * ind;
     if (leftchild < pq->alarm_count) {
       if (gpr_time_cmp(pq->alarms[leftchild]->deadline,
                        pq->alarms[ind]->deadline) >= 0) {
@@ -101,13 +102,14 @@ static int *all_top(grpc_alarm_heap *pq, int *n) {
 }
 
 static void check_pq_top(grpc_alarm *elements, grpc_alarm_heap *pq,
-                         gpr_uint8 *inpq, int num_elements) {
+                         gpr_uint8 *inpq, size_t num_elements) {
   gpr_timespec max_deadline = gpr_inf_past(GPR_CLOCK_REALTIME);
-  int *max_deadline_indices = gpr_malloc(num_elements * sizeof(int));
-  int *top_elements;
-  int num_max_deadline_indices = 0;
-  int num_top_elements;
-  int i;
+  size_t *max_deadline_indices =
+      gpr_malloc(num_elements * sizeof(*max_deadline_indices));
+  size_t *top_elements;
+  size_t num_max_deadline_indices = 0;
+  size_t num_top_elements;
+  size_t i;
   for (i = 0; i < num_elements; ++i) {
     if (inpq[i] && gpr_time_cmp(elements[i].deadline, max_deadline) >= 0) {
       if (gpr_time_cmp(elements[i].deadline, max_deadline) > 0) {
@@ -117,7 +119,8 @@ static void check_pq_top(grpc_alarm *elements, grpc_alarm_heap *pq,
       max_deadline_indices[num_max_deadline_indices++] = elements[i].heap_index;
     }
   }
-  qsort(max_deadline_indices, num_max_deadline_indices, sizeof(int), cmp_elem);
+  qsort(max_deadline_indices, num_max_deadline_indices,
+        sizeof(*max_deadline_indices), cmp_elem);
   top_elements = all_top(pq, &num_top_elements);
   GPR_ASSERT(num_top_elements == num_max_deadline_indices);
   for (i = 0; i < num_top_elements; i++) {
@@ -128,7 +131,7 @@ static void check_pq_top(grpc_alarm *elements, grpc_alarm_heap *pq,
 }
 
 static int contains(grpc_alarm_heap *pq, grpc_alarm *el) {
-  int i;
+  size_t i;
   for (i = 0; i < pq->alarm_count; i++) {
     if (pq->alarms[i] == el) return 1;
   }
@@ -136,10 +139,10 @@ static int contains(grpc_alarm_heap *pq, grpc_alarm *el) {
 }
 
 static void check_valid(grpc_alarm_heap *pq) {
-  int i;
+  size_t i;
   for (i = 0; i < pq->alarm_count; ++i) {
-    int left_child = 1 + 2 * i;
-    int right_child = left_child + 1;
+    size_t left_child = 1u + 2u * i;
+    size_t right_child = left_child + 1u;
     if (left_child < pq->alarm_count) {
       GPR_ASSERT(gpr_time_cmp(pq->alarms[i]->deadline,
                               pq->alarms[left_child]->deadline) >= 0);
@@ -153,9 +156,9 @@ static void check_valid(grpc_alarm_heap *pq) {
 
 static void test1(void) {
   grpc_alarm_heap pq;
-  const int num_test_elements = 200;
-  const int num_test_operations = 10000;
-  int i;
+  const size_t num_test_elements = 200;
+  const size_t num_test_operations = 10000;
+  size_t i;
   grpc_alarm *test_elements = create_test_elements(num_test_elements);
   gpr_uint8 *inpq = gpr_malloc(num_test_elements);
 
@@ -182,7 +185,7 @@ static void test1(void) {
   check_pq_top(test_elements, &pq, inpq, num_test_elements);
 
   for (i = 0; i < num_test_operations; ++i) {
-    int elem_num = rand() % num_test_elements;
+    size_t elem_num = (size_t)rand() % num_test_elements;
     grpc_alarm *el = &test_elements[elem_num];
     if (!inpq[elem_num]) { /* not in pq */
       GPR_ASSERT(!contains(&pq, el));
@@ -209,11 +212,11 @@ static void test1(void) {
 
 static void shrink_test(void) {
   grpc_alarm_heap pq;
-  int i;
-  int expected_size;
+  size_t i;
+  size_t expected_size;
 
   /* A large random number to allow for multiple shrinkages, at least 512. */
-  const int num_elements = rand() % 2000 + 512;
+  const size_t num_elements = (size_t)rand() % 2000 + 512;
 
   grpc_alarm_heap_init(&pq);
 
@@ -243,7 +246,7 @@ static void shrink_test(void) {
      4 times the Size and not less than 2 times, but never goes below 16. */
   expected_size = pq.alarm_count;
   while (pq.alarm_count > 0) {
-    const int which = rand() % pq.alarm_count;
+    const size_t which = (size_t)rand() % pq.alarm_count;
     grpc_alarm *te = pq.alarms[which];
     grpc_alarm_heap_remove(&pq, te);
     gpr_free(te);
diff --git a/test/core/iomgr/endpoint_tests.c b/test/core/iomgr/endpoint_tests.c
index 27123eb216..853b9a32c2 100644
--- a/test/core/iomgr/endpoint_tests.c
+++ b/test/core/iomgr/endpoint_tests.c
@@ -86,7 +86,7 @@ static grpc_endpoint_test_fixture begin_test(grpc_endpoint_test_config config,
 static void end_test(grpc_endpoint_test_config config) { config.clean_up(); }
 
 static gpr_slice *allocate_blocks(size_t num_bytes, size_t slice_size,
-                                  size_t *num_blocks, int *current_data) {
+                                  size_t *num_blocks, gpr_uint8 *current_data) {
   size_t nslices = num_bytes / slice_size + (num_bytes % slice_size ? 1 : 0);
   gpr_slice *slices = malloc(sizeof(gpr_slice) * nslices);
   size_t num_bytes_left = num_bytes;
@@ -102,7 +102,7 @@ static gpr_slice *allocate_blocks(size_t num_bytes, size_t slice_size,
     buf = GPR_SLICE_START_PTR(slices[i]);
     for (j = 0; j < GPR_SLICE_LENGTH(slices[i]); ++j) {
       buf[j] = *current_data;
-      *current_data = (*current_data + 1) % 256;
+      (*current_data)++;
     }
   }
   GPR_ASSERT(num_bytes_left == 0);
@@ -117,7 +117,7 @@ struct read_and_write_test_state {
   size_t current_write_size;
   size_t bytes_written;
   int current_read_data;
-  int current_write_data;
+  gpr_uint8 current_write_data;
   int read_done;
   int write_done;
   gpr_slice_buffer incoming;
diff --git a/test/core/iomgr/fd_posix_test.c b/test/core/iomgr/fd_posix_test.c
index 8bba87d61f..75959069c0 100644
--- a/test/core/iomgr/fd_posix_test.c
+++ b/test/core/iomgr/fd_posix_test.c
@@ -83,7 +83,8 @@ static void create_test_socket(int port, int *socket_fd,
   /* Use local address for test */
   sin->sin_family = AF_INET;
   sin->sin_addr.s_addr = htonl(0x7f000001);
-  sin->sin_port = htons(port);
+  GPR_ASSERT(port >= 0 && port < 65536);
+  sin->sin_port = htons((gpr_uint16)port);
 }
 
 /* Dummy gRPC callback */
@@ -419,7 +420,7 @@ static void test_grpc_fd_change(void) {
   int flags;
   int sv[2];
   char data;
-  int result;
+  ssize_t result;
   grpc_iomgr_closure first_closure;
   grpc_iomgr_closure second_closure;
 
diff --git a/test/core/iomgr/tcp_posix_test.c b/test/core/iomgr/tcp_posix_test.c
index 8acaa433bb..59c498edff 100644
--- a/test/core/iomgr/tcp_posix_test.c
+++ b/test/core/iomgr/tcp_posix_test.c
@@ -81,7 +81,7 @@ static ssize_t fill_socket(int fd) {
   int i;
   unsigned char buf[256];
   for (i = 0; i < 256; ++i) {
-    buf[i] = i;
+    buf[i] = (gpr_uint8)i;
   }
   do {
     write_bytes = write(fd, buf, 256);
@@ -99,13 +99,13 @@ static size_t fill_socket_partial(int fd, size_t bytes) {
   unsigned char *buf = malloc(bytes);
   unsigned i;
   for (i = 0; i < bytes; ++i) {
-    buf[i] = i % 256;
+    buf[i] = (gpr_uint8)(i % 256);
   }
 
   do {
     write_bytes = write(fd, buf, bytes - total_bytes);
     if (write_bytes > 0) {
-      total_bytes += write_bytes;
+      total_bytes += (size_t)write_bytes;
     }
   } while ((write_bytes >= 0 || errno == EINTR) && bytes > total_bytes);
 
@@ -116,15 +116,15 @@ static size_t fill_socket_partial(int fd, size_t bytes) {
 
 struct read_socket_state {
   grpc_endpoint *ep;
-  ssize_t read_bytes;
-  ssize_t target_read_bytes;
+  size_t read_bytes;
+  size_t target_read_bytes;
   gpr_slice_buffer incoming;
   grpc_iomgr_closure read_cb;
 };
 
-static ssize_t count_slices(gpr_slice *slices, size_t nslices,
-                            int *current_data) {
-  ssize_t num_bytes = 0;
+static size_t count_slices(gpr_slice *slices, size_t nslices,
+                           int *current_data) {
+  size_t num_bytes = 0;
   unsigned i, j;
   unsigned char *buf;
   for (i = 0; i < nslices; ++i) {
@@ -140,7 +140,7 @@ static ssize_t count_slices(gpr_slice *slices, size_t nslices,
 
 static void read_cb(void *user_data, int success) {
   struct read_socket_state *state = (struct read_socket_state *)user_data;
-  ssize_t read_bytes;
+  size_t read_bytes;
   int current_data;
 
   GPR_ASSERT(success);
@@ -172,11 +172,11 @@ static void read_cb(void *user_data, int success) {
 }
 
 /* Write to a socket, then read from it using the grpc_tcp API. */
-static void read_test(ssize_t num_bytes, ssize_t slice_size) {
+static void read_test(size_t num_bytes, size_t slice_size) {
   int sv[2];
   grpc_endpoint *ep;
   struct read_socket_state state;
-  ssize_t written_bytes;
+  size_t written_bytes;
   gpr_timespec deadline = GRPC_TIMEOUT_SECONDS_TO_DEADLINE(20);
 
   gpr_log(GPR_INFO, "Read test of size %d, slice size %d", num_bytes,
@@ -222,7 +222,7 @@ static void read_test(ssize_t num_bytes, ssize_t slice_size) {
 
 /* Write to a socket until it fills up, then read from it using the grpc_tcp
    API. */
-static void large_read_test(ssize_t slice_size) {
+static void large_read_test(size_t slice_size) {
   int sv[2];
   grpc_endpoint *ep;
   struct read_socket_state state;
@@ -242,7 +242,7 @@ static void large_read_test(ssize_t slice_size) {
 
   state.ep = ep;
   state.read_bytes = 0;
-  state.target_read_bytes = written_bytes;
+  state.target_read_bytes = (size_t)written_bytes;
   gpr_slice_buffer_init(&state.incoming);
   grpc_iomgr_closure_init(&state.read_cb, read_cb, &state);
 
@@ -275,11 +275,11 @@ struct write_socket_state {
   int write_done;
 };
 
-static gpr_slice *allocate_blocks(ssize_t num_bytes, ssize_t slice_size,
-                                  size_t *num_blocks, int *current_data) {
-  size_t nslices = num_bytes / slice_size + (num_bytes % slice_size ? 1 : 0);
+static gpr_slice *allocate_blocks(size_t num_bytes, size_t slice_size,
+                                  size_t *num_blocks, gpr_uint8 *current_data) {
+  size_t nslices = num_bytes / slice_size + (num_bytes % slice_size ? 1u : 0u);
   gpr_slice *slices = gpr_malloc(sizeof(gpr_slice) * nslices);
-  ssize_t num_bytes_left = num_bytes;
+  size_t num_bytes_left = num_bytes;
   unsigned i, j;
   unsigned char *buf;
   *num_blocks = nslices;
@@ -291,7 +291,7 @@ static gpr_slice *allocate_blocks(ssize_t num_bytes, ssize_t slice_size,
     buf = GPR_SLICE_START_PTR(slices[i]);
     for (j = 0; j < GPR_SLICE_LENGTH(slices[i]); ++j) {
       buf[j] = *current_data;
-      *current_data = (*current_data + 1) % 256;
+      (*current_data)++;
     }
   }
   GPR_ASSERT(num_bytes_left == 0);
@@ -334,7 +334,7 @@ void drain_socket_blocking(int fd, size_t num_bytes, size_t read_size) {
       GPR_ASSERT(buf[i] == current);
       current = (current + 1) % 256;
     }
-    bytes_left -= bytes_read;
+    bytes_left -= (size_t)bytes_read;
     if (bytes_left == 0) break;
   }
   flags = fcntl(fd, F_GETFL, 0);
@@ -366,14 +366,14 @@ static ssize_t drain_socket(int fd) {
 /* Write to a socket using the grpc_tcp API, then drain it directly.
    Note that if the write does not complete immediately we need to drain the
    socket in parallel with the read. */
-static void write_test(ssize_t num_bytes, ssize_t slice_size) {
+static void write_test(size_t num_bytes, size_t slice_size) {
   int sv[2];
   grpc_endpoint *ep;
   struct write_socket_state state;
   ssize_t read_bytes;
   size_t num_blocks;
   gpr_slice *slices;
-  int current_data = 0;
+  gpr_uint8 current_data = 0;
   gpr_slice_buffer outgoing;
   grpc_iomgr_closure write_done_closure;
   gpr_timespec deadline = GRPC_TIMEOUT_SECONDS_TO_DEADLINE(20);
@@ -400,7 +400,7 @@ static void write_test(ssize_t num_bytes, ssize_t slice_size) {
     case GRPC_ENDPOINT_DONE:
       /* Write completed immediately */
       read_bytes = drain_socket(sv[0]);
-      GPR_ASSERT(read_bytes == num_bytes);
+      GPR_ASSERT((size_t)read_bytes == num_bytes);
       break;
     case GRPC_ENDPOINT_PENDING:
       drain_socket_blocking(sv[0], num_bytes, num_bytes);
@@ -426,7 +426,7 @@ static void write_test(ssize_t num_bytes, ssize_t slice_size) {
 }
 
 void run_tests(void) {
-  int i = 0;
+  size_t i = 0;
 
   read_test(100, 8192);
   read_test(10000, 8192);
diff --git a/test/core/iomgr/udp_server_test.c b/test/core/iomgr/udp_server_test.c
index c91752b937..c4f1896ba6 100644
--- a/test/core/iomgr/udp_server_test.c
+++ b/test/core/iomgr/udp_server_test.c
@@ -53,13 +53,13 @@ static void on_connect(void *arg, grpc_endpoint *udp) {}
 
 static void on_read(int fd, grpc_udp_server_cb new_transport_cb, void *cb_arg) {
   char read_buffer[512];
-  int byte_count;
+  ssize_t byte_count;
 
   gpr_mu_lock(GRPC_POLLSET_MU(&g_pollset));
   byte_count = recv(fd, read_buffer, sizeof(read_buffer), 0);
 
   g_number_of_reads++;
-  g_number_of_bytes_read += byte_count;
+  g_number_of_bytes_read += (int)byte_count;
 
   grpc_pollset_kick(&g_pollset, NULL);
   gpr_mu_unlock(GRPC_POLLSET_MU(&g_pollset));
diff --git a/test/core/json/json_rewrite.c b/test/core/json/json_rewrite.c
index 02f60a3163..82cc4090f3 100644
--- a/test/core/json/json_rewrite.c
+++ b/test/core/json/json_rewrite.c
@@ -34,8 +34,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#include <grpc/support/cmdline.h>
 #include <grpc/support/alloc.h>
+#include <grpc/support/cmdline.h>
+#include <grpc/support/log.h>
 
 #include "src/core/json/json_reader.h"
 #include "src/core/json/json_writer.h"
@@ -81,7 +82,7 @@ grpc_json_writer_vtable writer_vtable = {json_writer_output_char,
 static void check_string(json_reader_userdata* state, size_t needed) {
   if (state->free_space >= needed) return;
   needed -= state->free_space;
-  needed = (needed + 0xff) & ~0xff;
+  needed = (needed + 0xffu) & ~0xffu;
   state->scratchpad = gpr_realloc(state->scratchpad, state->allocated + needed);
   state->free_space += needed;
   state->allocated += needed;
@@ -96,29 +97,30 @@ static void json_reader_string_clear(void* userdata) {
 static void json_reader_string_add_char(void* userdata, gpr_uint32 c) {
   json_reader_userdata* state = userdata;
   check_string(state, 1);
-  state->scratchpad[state->string_len++] = c;
+  GPR_ASSERT(c < 256);
+  state->scratchpad[state->string_len++] = (char)c;
 }
 
 static void json_reader_string_add_utf32(void* userdata, gpr_uint32 c) {
   if (c <= 0x7f) {
     json_reader_string_add_char(userdata, c);
   } else if (c <= 0x7ff) {
-    int b1 = 0xc0 | ((c >> 6) & 0x1f);
-    int b2 = 0x80 | (c & 0x3f);
+    gpr_uint32 b1 = 0xc0u | ((c >> 6u) & 0x1fu);
+    gpr_uint32 b2 = 0x80u | (c & 0x3fu);
     json_reader_string_add_char(userdata, b1);
     json_reader_string_add_char(userdata, b2);
-  } else if (c <= 0xffff) {
-    int b1 = 0xe0 | ((c >> 12) & 0x0f);
-    int b2 = 0x80 | ((c >> 6) & 0x3f);
-    int b3 = 0x80 | (c & 0x3f);
+  } else if (c <= 0xffffu) {
+    gpr_uint32 b1 = 0xe0u | ((c >> 12u) & 0x0fu);
+    gpr_uint32 b2 = 0x80u | ((c >> 6u) & 0x3fu);
+    gpr_uint32 b3 = 0x80u | (c & 0x3fu);
     json_reader_string_add_char(userdata, b1);
     json_reader_string_add_char(userdata, b2);
     json_reader_string_add_char(userdata, b3);
-  } else if (c <= 0x1fffff) {
-    int b1 = 0xf0 | ((c >> 18) & 0x07);
-    int b2 = 0x80 | ((c >> 12) & 0x3f);
-    int b3 = 0x80 | ((c >> 6) & 0x3f);
-    int b4 = 0x80 | (c & 0x3f);
+  } else if (c <= 0x1fffffu) {
+    gpr_uint32 b1 = 0xf0u | ((c >> 18u) & 0x07u);
+    gpr_uint32 b2 = 0x80u | ((c >> 12u) & 0x3fu);
+    gpr_uint32 b3 = 0x80u | ((c >> 6u) & 0x3fu);
+    gpr_uint32 b4 = 0x80u | (c & 0x3fu);
     json_reader_string_add_char(userdata, b1);
     json_reader_string_add_char(userdata, b2);
     json_reader_string_add_char(userdata, b3);
@@ -132,7 +134,7 @@ static gpr_uint32 json_reader_read_char(void* userdata) {
 
   r = fgetc(state->in);
   if (r == EOF) r = GRPC_JSON_READ_CHAR_EOF;
-  return r;
+  return (gpr_uint32)r;
 }
 
 static void json_reader_container_begins(void* userdata, grpc_json_type type) {
diff --git a/test/core/json/json_rewrite_test.c b/test/core/json/json_rewrite_test.c
index f5859322ea..d26ef53b2d 100644
--- a/test/core/json/json_rewrite_test.c
+++ b/test/core/json/json_rewrite_test.c
@@ -93,7 +93,7 @@ grpc_json_writer_vtable writer_vtable = {json_writer_output_char,
 static void check_string(json_reader_userdata* state, size_t needed) {
   if (state->free_space >= needed) return;
   needed -= state->free_space;
-  needed = (needed + 0xff) & ~0xff;
+  needed = (needed + 0xffu) & ~0xffu;
   state->scratchpad = gpr_realloc(state->scratchpad, state->allocated + needed);
   state->free_space += needed;
   state->allocated += needed;
@@ -108,29 +108,30 @@ static void json_reader_string_clear(void* userdata) {
 static void json_reader_string_add_char(void* userdata, gpr_uint32 c) {
   json_reader_userdata* state = userdata;
   check_string(state, 1);
-  state->scratchpad[state->string_len++] = c;
+  GPR_ASSERT(c <= 256);
+  state->scratchpad[state->string_len++] = (char)c;
 }
 
 static void json_reader_string_add_utf32(void* userdata, gpr_uint32 c) {
   if (c <= 0x7f) {
     json_reader_string_add_char(userdata, c);
-  } else if (c <= 0x7ff) {
-    int b1 = 0xc0 | ((c >> 6) & 0x1f);
-    int b2 = 0x80 | (c & 0x3f);
+  } else if (c <= 0x7ffu) {
+    gpr_uint32 b1 = 0xc0u | ((c >> 6u) & 0x1fu);
+    gpr_uint32 b2 = 0x80u | (c & 0x3fu);
     json_reader_string_add_char(userdata, b1);
     json_reader_string_add_char(userdata, b2);
-  } else if (c <= 0xffff) {
-    int b1 = 0xe0 | ((c >> 12) & 0x0f);
-    int b2 = 0x80 | ((c >> 6) & 0x3f);
-    int b3 = 0x80 | (c & 0x3f);
+  } else if (c <= 0xffffu) {
+    gpr_uint32 b1 = 0xe0u | ((c >> 12u) & 0x0fu);
+    gpr_uint32 b2 = 0x80u | ((c >> 6u) & 0x3fu);
+    gpr_uint32 b3 = 0x80u | (c & 0x3fu);
     json_reader_string_add_char(userdata, b1);
     json_reader_string_add_char(userdata, b2);
     json_reader_string_add_char(userdata, b3);
-  } else if (c <= 0x1fffff) {
-    int b1 = 0xf0 | ((c >> 18) & 0x07);
-    int b2 = 0x80 | ((c >> 12) & 0x3f);
-    int b3 = 0x80 | ((c >> 6) & 0x3f);
-    int b4 = 0x80 | (c & 0x3f);
+  } else if (c <= 0x1fffffu) {
+    gpr_uint32 b1 = 0xf0u | ((c >> 18u) & 0x07u);
+    gpr_uint32 b2 = 0x80u | ((c >> 12u) & 0x3fu);
+    gpr_uint32 b3 = 0x80u | ((c >> 6u) & 0x3fu);
+    gpr_uint32 b4 = 0x80u | (c & 0x3fu);
     json_reader_string_add_char(userdata, b1);
     json_reader_string_add_char(userdata, b2);
     json_reader_string_add_char(userdata, b3);
@@ -151,7 +152,7 @@ static gpr_uint32 json_reader_read_char(void* userdata) {
 
   r = fgetc(state->in);
   if (r == EOF) r = GRPC_JSON_READ_CHAR_EOF;
-  return r;
+  return (gpr_uint32)r;
 }
 
 static void json_reader_container_begins(void* userdata, grpc_json_type type) {
diff --git a/test/core/profiling/timers_test.c b/test/core/profiling/timers_test.c
index 12b08c115e..b79cde64bd 100644
--- a/test/core/profiling/timers_test.c
+++ b/test/core/profiling/timers_test.c
@@ -35,22 +35,22 @@
 #include <stdlib.h>
 #include "test/core/util/test_config.h"
 
-void test_log_events(int num_seqs) {
-  int start = 0;
-  int *state;
+void test_log_events(size_t num_seqs) {
+  size_t start = 0;
+  size_t *state;
   state = calloc(num_seqs, sizeof(state[0]));
   while (start < num_seqs) {
-    int i;
-    int row;
+    size_t i;
+    size_t row;
     if (state[start] == 3) { /* Already done with this posn */
       start++;
       continue;
     }
 
-    row = rand() % 10; /* how many in a row */
+    row = (size_t)rand() % 10; /* how many in a row */
     for (i = start; (i < start + row) && (i < num_seqs); i++) {
-      int j;
-      int advance = 1 + rand() % 3; /* how many to advance by */
+      size_t j;
+      size_t advance = 1 + (size_t)rand() % 3; /* how many to advance by */
       for (j = 0; j < advance; j++) {
         switch (state[i]) {
           case 0:
diff --git a/test/core/security/base64_test.c b/test/core/security/base64_test.c
index f8b7ebf554..6d49b6d1a1 100644
--- a/test/core/security/base64_test.c
+++ b/test/core/security/base64_test.c
@@ -70,7 +70,7 @@ static void test_full_range_encode_decode_b64(int url_safe, int multiline) {
   size_t i;
   char *b64;
   gpr_slice orig_decoded;
-  for (i = 0; i < sizeof(orig); i++) orig[i] = (char)i;
+  for (i = 0; i < sizeof(orig); i++) orig[i] = (gpr_uint8)i;
 
   /* Try all the different paddings. */
   for (i = 0; i < 3; i++) {
@@ -122,7 +122,7 @@ static void test_url_safe_unsafe_mismtach_failure(void) {
   char *b64;
   gpr_slice orig_decoded;
   int url_safe = 1;
-  for (i = 0; i < sizeof(orig); i++) orig[i] = (char)i;
+  for (i = 0; i < sizeof(orig); i++) orig[i] = (gpr_uint8)i;
 
   b64 = grpc_base64_encode(orig, sizeof(orig), url_safe, 0);
   orig_decoded = grpc_base64_decode(b64, !url_safe);
diff --git a/test/core/security/json_token_test.c b/test/core/security/json_token_test.c
index 0bac61eb54..740fd018b6 100644
--- a/test/core/security/json_token_test.c
+++ b/test/core/security/json_token_test.c
@@ -391,20 +391,21 @@ static void test_jwt_encode_and_sign(
   char *jwt = jwt_encode_and_sign_func(&json_key);
   const char *dot = strchr(jwt, '.');
   GPR_ASSERT(dot != NULL);
-  parsed_header = parse_json_part_from_jwt(jwt, dot - jwt, &scratchpad);
+  parsed_header =
+      parse_json_part_from_jwt(jwt, (size_t)(dot - jwt), &scratchpad);
   GPR_ASSERT(parsed_header != NULL);
   check_jwt_header(parsed_header);
-  offset = dot - jwt + 1;
+  offset = (size_t)(dot - jwt) + 1;
   grpc_json_destroy(parsed_header);
   gpr_free(scratchpad);
 
   dot = strchr(jwt + offset, '.');
   GPR_ASSERT(dot != NULL);
-  parsed_claim =
-      parse_json_part_from_jwt(jwt + offset, dot - (jwt + offset), &scratchpad);
+  parsed_claim = parse_json_part_from_jwt(
+      jwt + offset, (size_t)(dot - (jwt + offset)), &scratchpad);
   GPR_ASSERT(parsed_claim != NULL);
   check_jwt_claim_func(parsed_claim);
-  offset = dot - jwt + 1;
+  offset = (size_t)(dot - jwt) + 1;
   grpc_json_destroy(parsed_claim);
   gpr_free(scratchpad);
 
diff --git a/test/core/support/murmur_hash_test.c b/test/core/support/murmur_hash_test.c
index 2462abf7de..1762486776 100644
--- a/test/core/support/murmur_hash_test.c
+++ b/test/core/support/murmur_hash_test.c
@@ -48,7 +48,7 @@ static void verification_test(hash_func hash, gpr_uint32 expected) {
   gpr_uint8 key[256];
   gpr_uint32 hashes[256];
   gpr_uint32 final = 0;
-  int i;
+  size_t i;
 
   memset(key, 0, sizeof(key));
   memset(hashes, 0, sizeof(hashes));
@@ -57,8 +57,8 @@ static void verification_test(hash_func hash, gpr_uint32 expected) {
      the seed */
 
   for (i = 0; i < 256; i++) {
-    key[i] = (uint8_t)i;
-    hashes[i] = hash(key, i, 256 - i);
+    key[i] = (gpr_uint8)i;
+    hashes[i] = hash(key, i, (gpr_uint32)(256u - i));
   }
 
   /* Then hash the result array */
diff --git a/test/core/support/slice_test.c b/test/core/support/slice_test.c
index 3ca87427dd..1d202f0618 100644
--- a/test/core/support/slice_test.c
+++ b/test/core/support/slice_test.c
@@ -66,7 +66,7 @@ static void test_slice_malloc_returns_something_sensible(void) {
     }
     /* We must be able to write to every byte of the data */
     for (i = 0; i < length; i++) {
-      GPR_SLICE_START_PTR(slice)[i] = (char)i;
+      GPR_SLICE_START_PTR(slice)[i] = (gpr_uint8)i;
     }
     /* And finally we must succeed in destroying the slice */
     gpr_slice_unref(slice);
@@ -116,7 +116,7 @@ static void test_slice_sub_works(unsigned length) {
      beginning of the slice. */
   slice = gpr_slice_malloc(length);
   for (i = 0; i < length; i++) {
-    GPR_SLICE_START_PTR(slice)[i] = i;
+    GPR_SLICE_START_PTR(slice)[i] = (gpr_uint8)i;
   }
 
   /* Ensure that for all subsets length is correct and that we start on the
@@ -143,10 +143,10 @@ static void check_head_tail(gpr_slice slice, gpr_slice head, gpr_slice tail) {
                          GPR_SLICE_START_PTR(tail), GPR_SLICE_LENGTH(tail)));
 }
 
-static void test_slice_split_head_works(int length) {
+static void test_slice_split_head_works(size_t length) {
   gpr_slice slice;
   gpr_slice head, tail;
-  int i;
+  size_t i;
 
   LOG_TEST_NAME("test_slice_split_head_works");
   gpr_log(GPR_INFO, "length=%d", length);
@@ -155,7 +155,7 @@ static void test_slice_split_head_works(int length) {
      beginning of the slice. */
   slice = gpr_slice_malloc(length);
   for (i = 0; i < length; i++) {
-    GPR_SLICE_START_PTR(slice)[i] = i;
+    GPR_SLICE_START_PTR(slice)[i] = (gpr_uint8)i;
   }
 
   /* Ensure that for all subsets length is correct and that we start on the
@@ -171,10 +171,10 @@ static void test_slice_split_head_works(int length) {
   gpr_slice_unref(slice);
 }
 
-static void test_slice_split_tail_works(int length) {
+static void test_slice_split_tail_works(size_t length) {
   gpr_slice slice;
   gpr_slice head, tail;
-  int i;
+  size_t i;
 
   LOG_TEST_NAME("test_slice_split_tail_works");
   gpr_log(GPR_INFO, "length=%d", length);
@@ -183,7 +183,7 @@ static void test_slice_split_tail_works(int length) {
      beginning of the slice. */
   slice = gpr_slice_malloc(length);
   for (i = 0; i < length; i++) {
-    GPR_SLICE_START_PTR(slice)[i] = i;
+    GPR_SLICE_START_PTR(slice)[i] = (gpr_uint8)i;
   }
 
   /* Ensure that for all subsets length is correct and that we start on the
diff --git a/test/core/support/stack_lockfree_test.c b/test/core/support/stack_lockfree_test.c
index 02ec3154d5..0f49e6fa52 100644
--- a/test/core/support/stack_lockfree_test.c
+++ b/test/core/support/stack_lockfree_test.c
@@ -46,9 +46,10 @@
 
 #define MAX_THREADS 32
 
-static void test_serial_sized(int size) {
+static void test_serial_sized(size_t size) {
   gpr_stack_lockfree *stack = gpr_stack_lockfree_create(size);
-  int i;
+  size_t i;
+  size_t j;
 
   /* First try popping empty */
   GPR_ASSERT(gpr_stack_lockfree_pop(stack) == -1);
@@ -60,12 +61,11 @@ static void test_serial_sized(int size) {
 
   /* Now add repeatedly more items and check them */
   for (i = 1; i < size; i *= 2) {
-    int j;
     for (j = 0; j <= i; j++) {
-      GPR_ASSERT(gpr_stack_lockfree_push(stack, j) == (j == 0));
+      GPR_ASSERT(gpr_stack_lockfree_push(stack, (int)j) == (j == 0));
     }
     for (j = 0; j <= i; j++) {
-      GPR_ASSERT(gpr_stack_lockfree_pop(stack) == i - j);
+      GPR_ASSERT(gpr_stack_lockfree_pop(stack) == (int)(i - j));
     }
     GPR_ASSERT(gpr_stack_lockfree_pop(stack) == -1);
   }
@@ -74,7 +74,7 @@ static void test_serial_sized(int size) {
 }
 
 static void test_serial() {
-  int i;
+  size_t i;
   for (i = 128; i < MAX_STACK_SIZE; i *= 2) {
     test_serial_sized(i);
   }
@@ -107,7 +107,7 @@ static void test_mt_body(void *v) {
   }
 }
 
-static void test_mt_sized(int size, int nth) {
+static void test_mt_sized(size_t size, int nth) {
   gpr_stack_lockfree *stack;
   struct test_arg args[MAX_THREADS];
   gpr_thd_id thds[MAX_THREADS];
@@ -118,7 +118,7 @@ static void test_mt_sized(int size, int nth) {
   stack = gpr_stack_lockfree_create(size);
   for (i = 0; i < nth; i++) {
     args[i].stack = stack;
-    args[i].stack_size = size;
+    args[i].stack_size = (int)size;
     args[i].nthreads = nth;
     args[i].rank = i;
     args[i].sum = 0;
@@ -137,7 +137,8 @@ static void test_mt_sized(int size, int nth) {
 }
 
 static void test_mt() {
-  int size, nth;
+  size_t size;
+  int nth;
   for (nth = 1; nth < MAX_THREADS; nth++) {
     for (size = 128; size < MAX_STACK_SIZE; size *= 2) {
       test_mt_sized(size, nth);
diff --git a/test/core/support/time_test.c b/test/core/support/time_test.c
index 594863c278..ce35edd83c 100644
--- a/test/core/support/time_test.c
+++ b/test/core/support/time_test.c
@@ -43,14 +43,14 @@
 #include <grpc/support/time.h>
 #include "test/core/util/test_config.h"
 
-static void to_fp(void *arg, const char *buf, int len) {
+static void to_fp(void *arg, const char *buf, size_t len) {
   fwrite(buf, 1, len, (FILE *)arg);
 }
 
 /* Convert gpr_uintmax x to ascii base b (2..16), and write with
    (*writer)(arg, ...), zero padding to "chars" digits).  */
 static void u_to_s(gpr_uintmax x, unsigned base, int chars,
-                   void (*writer)(void *arg, const char *buf, int len),
+                   void (*writer)(void *arg, const char *buf, size_t len),
                    void *arg) {
   char buf[64];
   char *p = buf + sizeof(buf);
@@ -59,25 +59,25 @@ static void u_to_s(gpr_uintmax x, unsigned base, int chars,
     x /= base;
     chars--;
   } while (x != 0 || chars > 0);
-  (*writer)(arg, p, buf + sizeof(buf) - p);
+  (*writer)(arg, p, (size_t)(buf + sizeof(buf) - p));
 }
 
 /* Convert gpr_intmax x to ascii base b (2..16), and write with
    (*writer)(arg, ...), zero padding to "chars" digits).  */
 static void i_to_s(gpr_intmax x, unsigned base, int chars,
-                   void (*writer)(void *arg, const char *buf, int len),
+                   void (*writer)(void *arg, const char *buf, size_t len),
                    void *arg) {
   if (x < 0) {
     (*writer)(arg, "-", 1);
-    u_to_s(-x, base, chars - 1, writer, arg);
+    u_to_s((gpr_uintmax)-x, base, chars - 1, writer, arg);
   } else {
-    u_to_s(x, base, chars, writer, arg);
+    u_to_s((gpr_uintmax)x, base, chars, writer, arg);
   }
 }
 
 /* Convert ts to ascii, and write with (*writer)(arg, ...).  */
 static void ts_to_s(gpr_timespec t,
-                    void (*writer)(void *arg, const char *buf, int len),
+                    void (*writer)(void *arg, const char *buf, size_t len),
                     void *arg) {
   if (t.tv_sec < 0 && t.tv_nsec != 0) {
     t.tv_sec++;
@@ -96,7 +96,7 @@ static void test_values(void) {
 
   x = gpr_inf_future(GPR_CLOCK_REALTIME);
   fprintf(stderr, "far future ");
-  u_to_s(x.tv_sec, 16, 16, &to_fp, stderr);
+  i_to_s(x.tv_sec, 16, 16, &to_fp, stderr);
   fprintf(stderr, "\n");
   GPR_ASSERT(x.tv_sec >= INT_MAX);
   fprintf(stderr, "far future ");
@@ -105,7 +105,7 @@ static void test_values(void) {
 
   x = gpr_inf_past(GPR_CLOCK_REALTIME);
   fprintf(stderr, "far past   ");
-  u_to_s(x.tv_sec, 16, 16, &to_fp, stderr);
+  i_to_s(x.tv_sec, 16, 16, &to_fp, stderr);
   fprintf(stderr, "\n");
   GPR_ASSERT(x.tv_sec <= INT_MIN);
   fprintf(stderr, "far past   ");
diff --git a/test/core/surface/byte_buffer_reader_test.c b/test/core/surface/byte_buffer_reader_test.c
index d9c60e4212..560e0ac7b2 100644
--- a/test/core/surface/byte_buffer_reader_test.c
+++ b/test/core/surface/byte_buffer_reader_test.c
@@ -113,14 +113,14 @@ static void test_read_none_compressed_slice(void) {
 }
 
 static void read_compressed_slice(grpc_compression_algorithm algorithm,
-                                  int input_size) {
+                                  size_t input_size) {
   gpr_slice input_slice;
   gpr_slice_buffer sliceb_in;
   gpr_slice_buffer sliceb_out;
   grpc_byte_buffer *buffer;
   grpc_byte_buffer_reader reader;
   gpr_slice read_slice;
-  int read_count = 0;
+  size_t read_count = 0;
 
   gpr_slice_buffer_init(&sliceb_in);
   gpr_slice_buffer_init(&sliceb_out);
@@ -149,13 +149,13 @@ static void read_compressed_slice(grpc_compression_algorithm algorithm,
 }
 
 static void test_read_gzip_compressed_slice(void) {
-  const int INPUT_SIZE = 2048;
+  const size_t INPUT_SIZE = 2048;
   LOG_TEST("test_read_gzip_compressed_slice");
   read_compressed_slice(GRPC_COMPRESS_GZIP, INPUT_SIZE);
 }
 
 static void test_read_deflate_compressed_slice(void) {
-  const int INPUT_SIZE = 2048;
+  const size_t INPUT_SIZE = 2048;
   LOG_TEST("test_read_deflate_compressed_slice");
   read_compressed_slice(GRPC_COMPRESS_DEFLATE, INPUT_SIZE);
 }
diff --git a/test/core/surface/completion_queue_test.c b/test/core/surface/completion_queue_test.c
index c382b2a5aa..0eeb5dac45 100644
--- a/test/core/surface/completion_queue_test.c
+++ b/test/core/surface/completion_queue_test.c
@@ -177,7 +177,7 @@ typedef struct test_thread_options {
   gpr_event on_phase1_done;
   gpr_event *phase2;
   gpr_event on_finished;
-  int events_triggered;
+  size_t events_triggered;
   int id;
   grpc_completion_queue *cc;
 } test_thread_options;
@@ -251,14 +251,14 @@ static void consumer_thread(void *arg) {
   }
 }
 
-static void test_threading(int producers, int consumers) {
+static void test_threading(size_t producers, size_t consumers) {
   test_thread_options *options =
       gpr_malloc((producers + consumers) * sizeof(test_thread_options));
   gpr_event phase1 = GPR_EVENT_INIT;
   gpr_event phase2 = GPR_EVENT_INIT;
   grpc_completion_queue *cc = grpc_completion_queue_create(NULL);
-  int i;
-  int total_consumed = 0;
+  size_t i;
+  size_t total_consumed = 0;
   static int optid = 101;
 
   gpr_log(GPR_INFO, "%s: %d producers, %d consumers", "test_threading",
diff --git a/test/core/surface/lame_client_test.c b/test/core/surface/lame_client_test.c
index 96434193c9..0d29bea555 100644
--- a/test/core/surface/lame_client_test.c
+++ b/test/core/surface/lame_client_test.c
@@ -82,7 +82,7 @@ int main(int argc, char **argv) {
   op->flags = 0;
   op->reserved = NULL;
   op++;
-  error = grpc_call_start_batch(call, ops, op - ops, tag(1), NULL);
+  error = grpc_call_start_batch(call, ops, (size_t)(op - ops), tag(1), NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
 
   /* the call should immediately fail */
diff --git a/test/core/transport/chttp2/hpack_table_test.c b/test/core/transport/chttp2/hpack_table_test.c
index 15b37d17b6..aa3e273a6c 100644
--- a/test/core/transport/chttp2/hpack_table_test.c
+++ b/test/core/transport/chttp2/hpack_table_test.c
@@ -49,8 +49,8 @@ static void assert_str(const grpc_chttp2_hptbl *tbl, grpc_mdstr *mdstr,
   GPR_ASSERT(gpr_slice_str_cmp(mdstr->slice, str) == 0);
 }
 
-static void assert_index(const grpc_chttp2_hptbl *tbl, int idx, const char *key,
-                         const char *value) {
+static void assert_index(const grpc_chttp2_hptbl *tbl, gpr_uint32 idx,
+                         const char *key, const char *value) {
   grpc_mdelem *md = grpc_chttp2_hptbl_lookup(tbl, idx);
   assert_str(tbl, md->key, key);
   assert_str(tbl, md->value, value);
diff --git a/test/core/transport/chttp2/stream_encoder_test.c b/test/core/transport/chttp2/stream_encoder_test.c
index e6731ff195..71db98c69e 100644
--- a/test/core/transport/chttp2/stream_encoder_test.c
+++ b/test/core/transport/chttp2/stream_encoder_test.c
@@ -52,14 +52,14 @@ int g_failure = 0;
 grpc_stream_op_buffer g_sopb;
 
 void **to_delete = NULL;
-int num_to_delete = 0;
-int cap_to_delete = 0;
+size_t num_to_delete = 0;
+size_t cap_to_delete = 0;
 
 static gpr_slice create_test_slice(size_t length) {
   gpr_slice slice = gpr_slice_malloc(length);
   size_t i;
   for (i = 0; i < length; i++) {
-    GPR_SLICE_START_PTR(slice)[i] = i;
+    GPR_SLICE_START_PTR(slice)[i] = (gpr_uint8)i;
   }
   return slice;
 }
@@ -75,8 +75,8 @@ static void verify_sopb(size_t window_available, int eof,
   gpr_slice_buffer_init(&output);
   grpc_sopb_init(&encops);
   GPR_ASSERT(expect_window_used ==
-             grpc_chttp2_preencode(g_sopb.ops, &g_sopb.nops, window_available,
-                                   &encops));
+             grpc_chttp2_preencode(g_sopb.ops, &g_sopb.nops,
+                                   (gpr_uint32)window_available, &encops));
   grpc_chttp2_encode(encops.ops, encops.nops, eof, 0xdeadbeef, &g_compressor,
                      &output);
   encops.nops = 0;
@@ -126,8 +126,8 @@ static void test_small_data_framing(void) {
   verify_sopb(10, 0, 5, "000005 0000 deadbeef 00000000ff");
 }
 
-static void add_sopb_headers(int n, ...) {
-  int i;
+static void add_sopb_headers(size_t n, ...) {
+  size_t i;
   grpc_metadata_batch b;
   va_list l;
   grpc_linked_mdelem *e = gpr_malloc(sizeof(*e) * n);
@@ -196,10 +196,10 @@ static void test_basic_headers(void) {
 }
 
 static void encode_int_to_str(int i, char *p) {
-  p[0] = 'a' + i % 26;
+  p[0] = (char)('a' + i % 26);
   i /= 26;
   GPR_ASSERT(i < 26);
-  p[1] = 'a' + i;
+  p[1] = (char)('a' + i);
   p[2] = 0;
 }
 
@@ -246,7 +246,7 @@ static void randstr(char *p, int bufsz) {
   int i;
   int len = 1 + rand() % bufsz;
   for (i = 0; i < len; i++) {
-    p[i] = 'a' + rand() % 26;
+    p[i] = (char)('a' + rand() % 26);
   }
   p[len] = 0;
 }
@@ -336,7 +336,7 @@ static void run_test(void (*test)(), const char *name) {
 }
 
 int main(int argc, char **argv) {
-  int i;
+  size_t i;
   grpc_test_init(argc, argv);
   TEST(test_small_data_framing);
   TEST(test_basic_headers);
diff --git a/test/core/transport/chttp2/stream_map_test.c b/test/core/transport/chttp2/stream_map_test.c
index b0bb3a8904..81fb80f84f 100644
--- a/test/core/transport/chttp2/stream_map_test.c
+++ b/test/core/transport/chttp2/stream_map_test.c
@@ -82,9 +82,9 @@ static void test_double_deletion(void) {
 }
 
 /* test add & lookup */
-static void test_basic_add_find(size_t n) {
+static void test_basic_add_find(gpr_uint32 n) {
   grpc_chttp2_stream_map map;
-  size_t i;
+  gpr_uint32 i;
   size_t got;
 
   LOG_TEST("test_basic_add_find");
@@ -107,15 +107,15 @@ static void test_basic_add_find(size_t n) {
 
 /* verify that for_each gets the right values during test_delete_evens_XXX */
 static void verify_for_each(void *user_data, gpr_uint32 stream_id, void *ptr) {
-  size_t *for_each_check = user_data;
+  gpr_uint32 *for_each_check = user_data;
   GPR_ASSERT(ptr);
   GPR_ASSERT(*for_each_check == stream_id);
   *for_each_check += 2;
 }
 
-static void check_delete_evens(grpc_chttp2_stream_map *map, size_t n) {
-  size_t for_each_check = 1;
-  size_t i;
+static void check_delete_evens(grpc_chttp2_stream_map *map, gpr_uint32 n) {
+  gpr_uint32 for_each_check = 1;
+  gpr_uint32 i;
   size_t got;
 
   GPR_ASSERT(NULL == grpc_chttp2_stream_map_find(map, 0));
@@ -139,9 +139,9 @@ static void check_delete_evens(grpc_chttp2_stream_map *map, size_t n) {
 
 /* add a bunch of keys, delete the even ones, and make sure the map is
    consistent */
-static void test_delete_evens_sweep(size_t n) {
+static void test_delete_evens_sweep(gpr_uint32 n) {
   grpc_chttp2_stream_map map;
-  size_t i;
+  gpr_uint32 i;
 
   LOG_TEST("test_delete_evens_sweep");
   gpr_log(GPR_INFO, "n = %d", n);
@@ -152,7 +152,8 @@ static void test_delete_evens_sweep(size_t n) {
   }
   for (i = 1; i <= n; i++) {
     if ((i & 1) == 0) {
-      GPR_ASSERT((void *)i == grpc_chttp2_stream_map_delete(&map, i));
+      GPR_ASSERT((void *)(gpr_uintptr)i ==
+                 grpc_chttp2_stream_map_delete(&map, i));
     }
   }
   check_delete_evens(&map, n);
@@ -161,9 +162,9 @@ static void test_delete_evens_sweep(size_t n) {
 
 /* add a bunch of keys, delete the even ones immediately, and make sure the map
    is consistent */
-static void test_delete_evens_incremental(size_t n) {
+static void test_delete_evens_incremental(gpr_uint32 n) {
   grpc_chttp2_stream_map map;
-  size_t i;
+  gpr_uint32 i;
 
   LOG_TEST("test_delete_evens_incremental");
   gpr_log(GPR_INFO, "n = %d", n);
@@ -181,10 +182,10 @@ static void test_delete_evens_incremental(size_t n) {
 
 /* add a bunch of keys, delete old ones after some time, ensure the
    backing array does not grow */
-static void test_periodic_compaction(size_t n) {
+static void test_periodic_compaction(gpr_uint32 n) {
   grpc_chttp2_stream_map map;
-  size_t i;
-  size_t del;
+  gpr_uint32 i;
+  gpr_uint32 del;
 
   LOG_TEST("test_periodic_compaction");
   gpr_log(GPR_INFO, "n = %d", n);
@@ -192,10 +193,11 @@ static void test_periodic_compaction(size_t n) {
   grpc_chttp2_stream_map_init(&map, 16);
   GPR_ASSERT(map.capacity == 16);
   for (i = 1; i <= n; i++) {
-    grpc_chttp2_stream_map_add(&map, i, (void *)i);
+    grpc_chttp2_stream_map_add(&map, i, (void *)(gpr_uintptr)i);
     if (i > 8) {
       del = i - 8;
-      GPR_ASSERT((void *)del == grpc_chttp2_stream_map_delete(&map, del));
+      GPR_ASSERT((void *)(gpr_uintptr)del ==
+                 grpc_chttp2_stream_map_delete(&map, del));
     }
   }
   GPR_ASSERT(map.capacity == 16);
@@ -203,9 +205,9 @@ static void test_periodic_compaction(size_t n) {
 }
 
 int main(int argc, char **argv) {
-  int n = 1;
-  int prev = 1;
-  int tmp;
+  gpr_uint32 n = 1;
+  gpr_uint32 prev = 1;
+  gpr_uint32 tmp;
 
   grpc_test_init(argc, argv);
 
diff --git a/test/core/transport/metadata_test.c b/test/core/transport/metadata_test.c
index 4a4d4bcb8a..1861442bb1 100644
--- a/test/core/transport/metadata_test.c
+++ b/test/core/transport/metadata_test.c
@@ -177,11 +177,11 @@ static void test_spin_creating_the_same_thing(void) {
 
 static void test_things_stick_around(void) {
   grpc_mdctx *ctx;
-  int i, j;
+  size_t i, j;
   char *buffer;
-  int nstrs = 1000;
+  size_t nstrs = 1000;
   grpc_mdstr **strs = gpr_malloc(sizeof(grpc_mdstr *) * nstrs);
-  int *shuf = gpr_malloc(sizeof(int) * nstrs);
+  size_t *shuf = gpr_malloc(sizeof(size_t) * nstrs);
   grpc_mdstr *test;
 
   LOG_TEST("test_things_stick_around");
@@ -201,9 +201,9 @@ static void test_things_stick_around(void) {
   }
 
   for (i = 0; i < nstrs; i++) {
-    int p = rand() % nstrs;
-    int q = rand() % nstrs;
-    int temp = shuf[p];
+    size_t p = (size_t)rand() % nstrs;
+    size_t q = (size_t)rand() % nstrs;
+    size_t temp = shuf[p];
     shuf[p] = shuf[q];
     shuf[q] = temp;
   }
diff --git a/test/core/util/parse_hexstring.c b/test/core/util/parse_hexstring.c
index bf5bc84b48..eced3173d1 100644
--- a/test/core/util/parse_hexstring.c
+++ b/test/core/util/parse_hexstring.c
@@ -35,7 +35,7 @@
 #include <grpc/support/log.h>
 
 gpr_slice parse_hexstring(const char *hexstring) {
-  int nibbles = 0;
+  size_t nibbles = 0;
   const char *p = 0;
   gpr_uint8 *out;
   gpr_uint8 temp;
@@ -54,10 +54,10 @@ gpr_slice parse_hexstring(const char *hexstring) {
   temp = 0;
   for (p = hexstring; *p; p++) {
     if (*p >= '0' && *p <= '9') {
-      temp = (temp << 4) | (*p - '0');
+      temp = (gpr_uint8)(temp << 4) | (gpr_uint8)(*p - '0');
       nibbles++;
     } else if (*p >= 'a' && *p <= 'f') {
-      temp = (temp << 4) | (*p - 'a' + 10);
+      temp = (gpr_uint8)(temp << 4) | (gpr_uint8)(*p - 'a' + 10);
       nibbles++;
     }
     if (nibbles == 2) {
diff --git a/test/core/util/port_posix.c b/test/core/util/port_posix.c
index 4781d334e2..be45bae496 100644
--- a/test/core/util/port_posix.c
+++ b/test/core/util/port_posix.c
@@ -102,7 +102,7 @@ static int is_port_available(int *port, int is_tcp) {
   /* Try binding to port */
   addr.sin_family = AF_INET;
   addr.sin_addr.s_addr = INADDR_ANY;
-  addr.sin_port = htons(*port);
+  addr.sin_port = htons((gpr_uint16)*port);
   if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
     gpr_log(GPR_DEBUG, "bind(port=%d) failed: %s", *port, strerror(errno));
     close(fd);
diff --git a/test/core/util/reconnect_server.c b/test/core/util/reconnect_server.c
index 61535cc5c0..71fb69b54f 100644
--- a/test/core/util/reconnect_server.c
+++ b/test/core/util/reconnect_server.c
@@ -81,7 +81,8 @@ static void on_connect(void *arg, grpc_endpoint *tcp) {
     } else {
       if (last_colon == NULL) {
         gpr_log(GPR_ERROR, "peer does not contain a ':'");
-      } else if (strncmp(server->peer, peer, last_colon - peer) != 0) {
+      } else if (strncmp(server->peer, peer, (size_t)(last_colon - peer)) !=
+                 0) {
         gpr_log(GPR_ERROR, "mismatched peer! %s vs %s", server->peer, peer);
       }
       gpr_free(peer);
@@ -115,7 +116,7 @@ void reconnect_server_start(reconnect_server *server, int port) {
   int port_added;
 
   addr.sin_family = AF_INET;
-  addr.sin_port = htons(port);
+  addr.sin_port = htons((gpr_uint16)port);
   memset(&addr.sin_addr, 0, sizeof(addr.sin_addr));
 
   server->tcp_server = grpc_tcp_server_create();
diff --git a/test/core/util/test_config.c b/test/core/util/test_config.c
index 685bdff530..f5d5cdb57c 100644
--- a/test/core/util/test_config.c
+++ b/test/core/util/test_config.c
@@ -42,12 +42,12 @@ double g_fixture_slowdown_factor = 1.0;
 
 #if GPR_GETPID_IN_UNISTD_H
 #include <unistd.h>
-static int seed(void) { return getpid(); }
+static unsigned seed(void) { return (unsigned)getpid(); }
 #endif
 
 #if GPR_GETPID_IN_PROCESS_H
 #include <process.h>
-static int seed(void) { return _getpid(); }
+static unsigned seed(void) { return _getpid(); }
 #endif
 
 #if GPR_WINDOWS_CRASH_HANDLER
diff --git a/test/core/util/test_config.h b/test/core/util/test_config.h
index ccef8620c1..15b71747fb 100644
--- a/test/core/util/test_config.h
+++ b/test/core/util/test_config.h
@@ -54,15 +54,17 @@ extern double g_fixture_slowdown_factor;
   (GRPC_TEST_SLOWDOWN_BUILD_FACTOR * GRPC_TEST_SLOWDOWN_MACHINE_FACTOR * \
    g_fixture_slowdown_factor)
 
-#define GRPC_TIMEOUT_SECONDS_TO_DEADLINE(x)                                \
-  gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),                               \
-               gpr_time_from_millis(GRPC_TEST_SLOWDOWN_FACTOR * 1e3 * (x), \
-                                    GPR_TIMESPAN))
+#define GRPC_TIMEOUT_SECONDS_TO_DEADLINE(x)                               \
+  gpr_time_add(                                                           \
+      gpr_now(GPR_CLOCK_MONOTONIC),                                       \
+      gpr_time_from_millis((long)(GRPC_TEST_SLOWDOWN_FACTOR * 1e3 * (x)), \
+                           GPR_TIMESPAN))
 
-#define GRPC_TIMEOUT_MILLIS_TO_DEADLINE(x)                                 \
-  gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),                               \
-               gpr_time_from_micros(GRPC_TEST_SLOWDOWN_FACTOR * 1e3 * (x), \
-                                    GPR_TIMESPAN))
+#define GRPC_TIMEOUT_MILLIS_TO_DEADLINE(x)                                \
+  gpr_time_add(                                                           \
+      gpr_now(GPR_CLOCK_MONOTONIC),                                       \
+      gpr_time_from_micros((long)(GRPC_TEST_SLOWDOWN_FACTOR * 1e3 * (x)), \
+                           GPR_TIMESPAN))
 
 #ifndef GRPC_TEST_CUSTOM_PICK_PORT
 #define GRPC_TEST_PICK_PORT
diff --git a/test/cpp/interop/client.cc b/test/cpp/interop/client.cc
index 20fe1c515f..ba44a918db 100644
--- a/test/cpp/interop/client.cc
+++ b/test/cpp/interop/client.cc
@@ -120,11 +120,10 @@ int main(int argc, char** argv) {
     grpc::string json_key = GetServiceAccountJsonKey();
     client.DoJwtTokenCreds(json_key);
   } else if (FLAGS_test_case == "oauth2_auth_token") {
-    grpc::string json_key = GetServiceAccountJsonKey();
-    client.DoOauth2AuthToken(json_key, FLAGS_oauth_scope);
+    client.DoOauth2AuthToken(FLAGS_default_service_account, FLAGS_oauth_scope);
   } else if (FLAGS_test_case == "per_rpc_creds") {
     grpc::string json_key = GetServiceAccountJsonKey();
-    client.DoPerRpcCreds(json_key, FLAGS_oauth_scope);
+    client.DoPerRpcCreds(json_key);
   } else if (FLAGS_test_case == "status_code_and_message") {
     client.DoStatusWithMessage();
   } else if (FLAGS_test_case == "all") {
@@ -143,8 +142,9 @@ int main(int argc, char** argv) {
     if (FLAGS_enable_ssl) {
       grpc::string json_key = GetServiceAccountJsonKey();
       client.DoJwtTokenCreds(json_key);
-      client.DoOauth2AuthToken(json_key, FLAGS_oauth_scope);
-      client.DoPerRpcCreds(json_key, FLAGS_oauth_scope);
+      client.DoOauth2AuthToken(
+          FLAGS_default_service_account, FLAGS_oauth_scope);
+      client.DoPerRpcCreds(json_key);
     }
     // compute_engine_creds only runs in GCE.
   } else {
diff --git a/test/cpp/interop/interop_client.cc b/test/cpp/interop/interop_client.cc
index 48ccf06da9..8124cae67a 100644
--- a/test/cpp/interop/interop_client.cc
+++ b/test/cpp/interop/interop_client.cc
@@ -196,36 +196,33 @@ void InteropClient::DoOauth2AuthToken(const grpc::string& username,
   AssertOkOrPrintErrorStatus(s);
   GPR_ASSERT(!response.username().empty());
   GPR_ASSERT(!response.oauth_scope().empty());
-  GPR_ASSERT(username.find(response.username()) != grpc::string::npos);
+  GPR_ASSERT(username == response.username());
   const char* oauth_scope_str = response.oauth_scope().c_str();
   GPR_ASSERT(oauth_scope.find(oauth_scope_str) != grpc::string::npos);
   gpr_log(GPR_INFO, "Unary with oauth2 access token credentials done.");
 }
 
-void InteropClient::DoPerRpcCreds(const grpc::string& username,
-                                  const grpc::string& oauth_scope) {
+void InteropClient::DoPerRpcCreds(const grpc::string& json_key) {
   gpr_log(GPR_INFO,
-          "Sending a unary rpc with per-rpc raw oauth2 access token ...");
+          "Sending a unary rpc with per-rpc JWT access token ...");
   SimpleRequest request;
   SimpleResponse response;
   request.set_fill_username(true);
-  request.set_fill_oauth_scope(true);
   std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));
 
   ClientContext context;
-  grpc::string access_token = GetOauth2AccessToken();
-  std::shared_ptr<Credentials> creds = AccessTokenCredentials(access_token);
+  std::chrono::seconds token_lifetime = std::chrono::hours(1);
+  std::shared_ptr<Credentials> creds =
+      ServiceAccountJWTAccessCredentials(json_key, token_lifetime.count());
+
   context.set_credentials(creds);
 
   Status s = stub->UnaryCall(&context, request, &response);
 
   AssertOkOrPrintErrorStatus(s);
   GPR_ASSERT(!response.username().empty());
-  GPR_ASSERT(!response.oauth_scope().empty());
-  GPR_ASSERT(username.find(response.username()) != grpc::string::npos);
-  const char* oauth_scope_str = response.oauth_scope().c_str();
-  GPR_ASSERT(oauth_scope.find(oauth_scope_str) != grpc::string::npos);
-  gpr_log(GPR_INFO, "Unary with per-rpc oauth2 access token done.");
+  GPR_ASSERT(json_key.find(response.username()) != grpc::string::npos);
+  gpr_log(GPR_INFO, "Unary with per-rpc JWT access token done.");
 }
 
 void InteropClient::DoJwtTokenCreds(const grpc::string& username) {
diff --git a/test/cpp/interop/interop_client.h b/test/cpp/interop/interop_client.h
index 5a085c4c02..7bcb58571e 100644
--- a/test/cpp/interop/interop_client.h
+++ b/test/cpp/interop/interop_client.h
@@ -68,12 +68,11 @@ class InteropClient {
   void DoJwtTokenCreds(const grpc::string& username);
   void DoComputeEngineCreds(const grpc::string& default_service_account,
                             const grpc::string& oauth_scope);
-  // username is a string containing the user email
+  // username the GCE default service account email
   void DoOauth2AuthToken(const grpc::string& username,
                          const grpc::string& oauth_scope);
   // username is a string containing the user email
-  void DoPerRpcCreds(const grpc::string& username,
-                     const grpc::string& oauth_scope);
+  void DoPerRpcCreds(const grpc::string& json_key);
 
  private:
   void PerformLargeUnary(SimpleRequest* request, SimpleResponse* response);
diff --git a/test/cpp/qps/server_async.cc b/test/cpp/qps/server_async.cc
index 0ed2048d4a..516598a0e2 100644
--- a/test/cpp/qps/server_async.cc
+++ b/test/cpp/qps/server_async.cc
@@ -98,7 +98,9 @@ class AsyncQpsServerTest : public Server {
     }
   }
   ~AsyncQpsServerTest() {
-    server_->Shutdown();
+    auto deadline = std::chrono::system_clock::now() +
+      std::chrono::seconds(10);
+    server_->Shutdown(deadline);
     for (auto ss = shutdown_state_.begin(); ss != shutdown_state_.end(); ++ss) {
       (*ss)->set_shutdown();
     }
diff --git a/tools/codegen/core/gen_hpack_tables.c b/tools/codegen/core/gen_hpack_tables.c
index 555f1e71c5..d924aba602 100644
--- a/tools/codegen/core/gen_hpack_tables.c
+++ b/tools/codegen/core/gen_hpack_tables.c
@@ -71,13 +71,13 @@ static unsigned char prefix_mask(unsigned char prefix_len) {
   unsigned char i;
   unsigned char out = 0;
   for (i = 0; i < prefix_len; i++) {
-    out |= 1 << (7 - i);
+    out |= (unsigned char)(1 << (7 - i));
   }
   return out;
 }
 
 static unsigned char suffix_mask(unsigned char prefix_len) {
-  return ~prefix_mask(prefix_len);
+  return (unsigned char)~prefix_mask(prefix_len);
 }
 
 static void generate_first_byte_lut(void) {
@@ -92,7 +92,7 @@ static void generate_first_byte_lut(void) {
     chrspec = NULL;
     for (j = 0; j < num_fields; j++) {
       if ((prefix_mask(fields[j].prefix_length) & i) == fields[j].prefix) {
-        suffix = suffix_mask(fields[j].prefix_length) & i;
+        suffix = suffix_mask(fields[j].prefix_length) & (unsigned char)i;
         if (suffix == suffix_mask(fields[j].prefix_length)) {
           if (fields[j].index != 2) continue;
         } else if (suffix == 0) {
@@ -127,7 +127,9 @@ static void generate_first_byte_lut(void) {
 /* represents a set of symbols as an array of booleans indicating inclusion */
 typedef struct { char included[GRPC_CHTTP2_NUM_HUFFSYMS]; } symset;
 /* represents a lookup table indexed by a nibble */
-typedef struct { int values[16]; } nibblelut;
+typedef struct { unsigned values[16]; } nibblelut;
+
+#define NOT_SET (~(unsigned)0)
 
 /* returns a symset that includes all possible symbols */
 static symset symset_all(void) {
@@ -148,7 +150,7 @@ static nibblelut nibblelut_empty(void) {
   nibblelut x;
   int i;
   for (i = 0; i < 16; i++) {
-    x.values[i] = -1;
+    x.values[i] = NOT_SET;
   }
   return x;
 }
@@ -168,7 +170,7 @@ static int nsyms(symset s) {
 /* global table of discovered huffman decoding states */
 static struct {
   /* the bit offset that this state starts at */
-  int bitofs;
+  unsigned bitofs;
   /* the set of symbols that this state started with */
   symset syms;
 
@@ -177,13 +179,13 @@ static struct {
   /* lookup table for what to emit */
   nibblelut emit;
 } huffstates[MAXHUFFSTATES];
-static int nhuffstates = 0;
+static unsigned nhuffstates = 0;
 
 /* given a number of decoded bits and a set of symbols that are live,
    return the index into the decoder table for this state.
    set isnew to 1 if this state was previously undiscovered */
-static int state_index(int bitofs, symset syms, int *isnew) {
-  int i;
+static unsigned state_index(unsigned bitofs, symset syms, unsigned *isnew) {
+  unsigned i;
   for (i = 0; i < nhuffstates; i++) {
     if (huffstates[i].bitofs != bitofs) continue;
     if (0 != memcmp(huffstates[i].syms.included, syms.included,
@@ -211,24 +213,24 @@ static int state_index(int bitofs, symset syms, int *isnew) {
    emit    - the symbol to emit on this nibble (or -1 if no symbol has been
              found)
    syms    - the set of symbols that could be matched */
-static void build_dec_tbl(int state, int nibble, int nibbits, unsigned bitofs,
-                          int emit, symset syms) {
-  int i;
+static void build_dec_tbl(unsigned state, unsigned nibble, int nibbits,
+                          unsigned bitofs, unsigned emit, symset syms) {
+  unsigned i;
   unsigned bit;
 
   /* If we have four bits in the nibble we're looking at, then we can fill in
      a slot in the lookup tables. */
   if (nibbits == 4) {
-    int isnew;
+    unsigned isnew;
     /* Find the state that we are in: this may be a new state, in which case
        we recurse to fill it in, or we may have already seen this state, in
        which case the recursion terminates */
-    int st = state_index(bitofs, syms, &isnew);
-    GPR_ASSERT(huffstates[state].next.values[nibble] == -1);
+    unsigned st = state_index(bitofs, syms, &isnew);
+    GPR_ASSERT(huffstates[state].next.values[nibble] == NOT_SET);
     huffstates[state].next.values[nibble] = st;
     huffstates[state].emit.values[nibble] = emit;
     if (isnew) {
-      build_dec_tbl(st, 0, 0, bitofs, -1, syms);
+      build_dec_tbl(st, 0, 0, bitofs, NOT_SET, syms);
     }
     return;
   }
@@ -290,8 +292,9 @@ static void dump_ctbl(const char *name) {
 }
 
 static void generate_huff_tables(void) {
-  int i;
-  build_dec_tbl(state_index(0, symset_all(), &i), 0, 0, 0, -1, symset_all());
+  unsigned i;
+  build_dec_tbl(state_index(0, symset_all(), &i), 0, 0, 0, NOT_SET,
+                symset_all());
 
   nctbl = 0;
   printf("static const gpr_uint8 next_tbl[%d] = {", nhuffstates);
@@ -333,7 +336,7 @@ static void generate_base64_inverse_table(void) {
 
   memset(inverse, 255, sizeof(inverse));
   for (i = 0; i < strlen(alphabet); i++) {
-    inverse[(unsigned char)alphabet[i]] = i;
+    inverse[(unsigned char)alphabet[i]] = (unsigned char)i;
   }
 
   printf("static const gpr_uint8 inverse_base64[256] = {");
diff --git a/tools/codegen/core/gen_legal_metadata_characters.c b/tools/codegen/core/gen_legal_metadata_characters.c
index 0fbc545d8d..2ffda54a21 100644
--- a/tools/codegen/core/gen_legal_metadata_characters.c
+++ b/tools/codegen/core/gen_legal_metadata_characters.c
@@ -41,7 +41,7 @@ static unsigned char legal_bits[256 / 8];
 static void legal(int x) {
   int byte = x / 8;
   int bit = x % 8;
-  legal_bits[byte] |= 1 << bit;
+  legal_bits[byte] |= (unsigned char)(1 << bit);
 }
 
 static void dump(void) {
diff --git a/tools/distrib/python/docgen.py b/tools/distrib/python/docgen.py
index d76792c56f..2acd3cc12f 100755
--- a/tools/distrib/python/docgen.py
+++ b/tools/distrib/python/docgen.py
@@ -81,7 +81,7 @@ if args.submit:
   assert args.doc_branch
   github_user = args.gh_user
   github_repository_owner = (
-      args.gh_repo_owner if args.gh_repo_owner else gh_user)
+      args.gh_repo_owner if args.gh_repo_owner else args.gh_user)
   # Create a temporary directory out of tree, checkout gh-pages from the
   # specified repository, edit it, and push it. It's up to the user to then go
   # onto GitHub and make a PR against grpc/grpc:gh-pages.
diff --git a/tools/dockerfile/grpc_build_deb/Dockerfile b/tools/dockerfile/grpc_build_deb/Dockerfile
deleted file mode 100644
index 7f025b6712..0000000000
--- a/tools/dockerfile/grpc_build_deb/Dockerfile
+++ /dev/null
@@ -1,51 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-# Dockerfile to build Debian packages for gRPC C core.
-FROM grpc/base
-
-# Add the file containing the gRPC version
-ADD version.txt version.txt
-
-# Add the update-to-date distpackages folder
-ADD distpackages distpackages
-
-# Install dependencies
-RUN echo 'deb http://http.debian.net/debian experimental main contrib non-free' >> /etc/apt/sources.list
-RUN apt-get update \
-  && apt-get -t experimental install -y openssl=1.0.2-1 \
-  && apt-get install -y lintian
-
-# Get the source from GitHub
-RUN git clone https://github.com/grpc/grpc.git /var/local/git/grpc
-RUN cd /var/local/git/grpc && \
-  git pull --recurse-submodules && \
-  git submodule update --init --recursive
-
-RUN /bin/bash -l -c 'cd /distpackages && ./build_deb_packages.sh'
diff --git a/tools/dockerfile/grpc_build_deb/version.txt b/tools/dockerfile/grpc_build_deb/version.txt
deleted file mode 100644
index a918a2aa18..0000000000
--- a/tools/dockerfile/grpc_build_deb/version.txt
+++ /dev/null
@@ -1 +0,0 @@
-0.6.0
diff --git a/tools/dockerfile/grpc_ruby_deb/Dockerfile b/tools/dockerfile/grpc_ruby_deb/Dockerfile
deleted file mode 100644
index 679fa51f5d..0000000000
--- a/tools/dockerfile/grpc_ruby_deb/Dockerfile
+++ /dev/null
@@ -1,60 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-# Dockerfile for gRPC Ruby, but using Debian packages for gRPC C core.
-FROM grpc/ruby_base
-
-# Pull the latest sources
-RUN cd /var/local/git/grpc \
-  && git pull --recurse-submodules \
-  && git submodule update --init --recursive
-
-# Make sure we don't rely on things that shouldn't be there.
-RUN make clean -C /var/local/git/grpc
-
-# Debian packages need to be supplied externally
-ADD libgrpc_amd64.deb libgrpc_amd64.deb
-ADD libgrpc-dev_amd64.deb libgrpc-dev_amd64.deb
-
-# Install the C core .deb packages
-RUN /bin/bash -l -c 'dpkg -i libgrpc_amd64.deb libgrpc-dev_amd64.deb'
-
-# Build ruby gRPC and run its tests
-RUN /bin/bash -l -c 'cd /var/local/git/grpc/src/ruby && bundle && rake'
-
-# Add a cacerts directory containing the Google root pem file, allowing the
-# ruby client to access the production test instance
-ADD cacerts cacerts
-
-# Add a service_account directory containing the auth creds file
-ADD service_account service_account
-
-# Specify the default command such that the interop server runs on its known
-# testing port
-CMD ["/bin/bash", "-l", "-c", "ruby /var/local/git/grpc/src/ruby/bin/interop/interop_server.rb --use_tls --port 8060"]
diff --git a/tools/dockerfile/grpc_ruby_deb/README.md b/tools/dockerfile/grpc_ruby_deb/README.md
deleted file mode 100644
index 0a3716b938..0000000000
--- a/tools/dockerfile/grpc_ruby_deb/README.md
+++ /dev/null
@@ -1,5 +0,0 @@
-GRPC RUBY Base Dockerfile (Debian package version)
-========================
-
-Dockerfile for creating the Ruby gRPC development Docker instance.
-Uses gRPC C core Debian packages instead of installing it using make.
diff --git a/tools/gce_setup/grpc_docker.sh b/tools/gce_setup/grpc_docker.sh
index 3fbd342b4c..84263ad6b9 100755
--- a/tools/gce_setup/grpc_docker.sh
+++ b/tools/gce_setup/grpc_docker.sh
@@ -530,7 +530,20 @@ grpc_cloud_prod_auth_test_args() {
 
   [[ -n $1 ]] && {  # client_type
     case $1 in
-      cxx|go|java|node|php|python|ruby|csharp_mono)
+      go|java|node|php|python|ruby|csharp_mono)
+        grpc_client_platform='Docker'
+        grpc_gen_test_cmd+="_gen_$1_cmd"
+        declare -F $grpc_gen_test_cmd >> /dev/null || {
+          echo "-f: test_func for $1 => $grpc_gen_test_cmd is not defined" 1>&2
+          return 2
+        }
+        shift
+        ;;
+      cxx)
+        if [ "$test_case" == "oauth2_auth_token" ]
+        then
+          grpc_gen_test_cmd="grpc_cloud_prod_auth_compute_engine_creds"
+        fi
         grpc_client_platform='Docker'
         grpc_gen_test_cmd+="_gen_$1_cmd"
         declare -F $grpc_gen_test_cmd >> /dev/null || {