58 files changed, 329 insertions, 162 deletions
diff --git a/src/core/lib/client_config/README.md b/src/core/ext/client_config/README.md
index 7024fd540d..7024fd540d 100644
--- a/src/core/lib/client_config/README.md
+++ b/src/core/ext/client_config/README.md
diff --git a/src/core/lib/surface/channel_connectivity.c b/src/core/ext/client_config/channel_connectivity.c
index 9a9ee422c2..3ebc333608 100644
--- a/src/core/lib/surface/channel_connectivity.c
+++ b/src/core/ext/client_config/channel_connectivity.c
@@ -36,7 +36,7 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 
-#include "src/core/lib/channel/client_channel.h"
+#include "src/core/ext/client_config/client_channel.h"
 #include "src/core/lib/iomgr/timer.h"
 #include "src/core/lib/surface/api_trace.h"
 #include "src/core/lib/surface/completion_queue.h"
diff --git a/src/core/lib/channel/client_channel.c b/src/core/ext/client_config/client_channel.c
index 55867ba80c..93d54fdcfe 100644
--- a/src/core/lib/channel/client_channel.c
+++ b/src/core/ext/client_config/client_channel.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/channel/client_channel.h"
+#include "src/core/ext/client_config/client_channel.h"
 
 #include <stdio.h>
 #include <string.h>
@@ -41,9 +41,9 @@
 #include <grpc/support/sync.h>
 #include <grpc/support/useful.h>
 
+#include "src/core/ext/client_config/subchannel_call_holder.h"
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/channel/connected_channel.h"
-#include "src/core/lib/channel/subchannel_call_holder.h"
 #include "src/core/lib/iomgr/iomgr.h"
 #include "src/core/lib/profiling/timers.h"
 #include "src/core/lib/support/string.h"
diff --git a/src/core/lib/channel/client_channel.h b/src/core/ext/client_config/client_channel.h
index ac418c8c51..1e47ad34ad 100644
--- a/src/core/lib/channel/client_channel.h
+++ b/src/core/ext/client_config/client_channel.h
@@ -31,11 +31,11 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CHANNEL_CLIENT_CHANNEL_H
-#define GRPC_CORE_LIB_CHANNEL_CLIENT_CHANNEL_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_CLIENT_CHANNEL_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_CLIENT_CHANNEL_H
 
+#include "src/core/ext/client_config/resolver.h"
 #include "src/core/lib/channel/channel_stack.h"
-#include "src/core/lib/client_config/resolver.h"
 
 /* A client channel is a channel that begins disconnected, and can connect
    to some endpoint on demand. If that endpoint disconnects, it will be
@@ -60,4 +60,4 @@ void grpc_client_channel_watch_connectivity_state(
     grpc_exec_ctx *exec_ctx, grpc_channel_element *elem, grpc_pollset *pollset,
     grpc_connectivity_state *state, grpc_closure *on_complete);
 
-#endif /* GRPC_CORE_LIB_CHANNEL_CLIENT_CHANNEL_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_CLIENT_CHANNEL_H */
diff --git a/src/core/lib/client_config/client_channel_factory.c b/src/core/ext/client_config/client_channel_factory.c
index d27b38d9f2..71c64c0da1 100644
--- a/src/core/lib/client_config/client_channel_factory.c
+++ b/src/core/ext/client_config/client_channel_factory.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/client_channel_factory.h"
+#include "src/core/ext/client_config/client_channel_factory.h"
 
 void grpc_client_channel_factory_ref(grpc_client_channel_factory* factory) {
   factory->vtable->ref(factory);
diff --git a/src/core/lib/client_config/client_channel_factory.h b/src/core/ext/client_config/client_channel_factory.h
index 0b71cd9bdb..1241b9b781 100644
--- a/src/core/lib/client_config/client_channel_factory.h
+++ b/src/core/ext/client_config/client_channel_factory.h
@@ -31,13 +31,13 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_CLIENT_CHANNEL_FACTORY_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_CLIENT_CHANNEL_FACTORY_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_CLIENT_CHANNEL_FACTORY_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_CLIENT_CHANNEL_FACTORY_H
 
 #include <grpc/impl/codegen/grpc_types.h>
 
+#include "src/core/ext/client_config/subchannel.h"
 #include "src/core/lib/channel/channel_stack.h"
-#include "src/core/lib/client_config/subchannel.h"
 
 typedef struct grpc_client_channel_factory grpc_client_channel_factory;
 typedef struct grpc_client_channel_factory_vtable
@@ -82,4 +82,4 @@ grpc_channel *grpc_client_channel_factory_create_channel(
     grpc_exec_ctx *exec_ctx, grpc_client_channel_factory *factory,
     const char *target, grpc_client_channel_type type, grpc_channel_args *args);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_CLIENT_CHANNEL_FACTORY_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_CLIENT_CHANNEL_FACTORY_H */
diff --git a/src/core/lib/client_config/client_config.c b/src/core/ext/client_config/client_config.c
index 2521023364..f9b8e68698 100644
--- a/src/core/lib/client_config/client_config.c
+++ b/src/core/ext/client_config/client_config.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/client_config.h"
+#include "src/core/ext/client_config/client_config.h"
 
 #include <string.h>
 
diff --git a/src/core/lib/client_config/client_config.h b/src/core/ext/client_config/client_config.h
index 8dc2f6b299..a6290cbcf0 100644
--- a/src/core/lib/client_config/client_config.h
+++ b/src/core/ext/client_config/client_config.h
@@ -31,10 +31,10 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_CLIENT_CONFIG_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_CLIENT_CONFIG_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_CLIENT_CONFIG_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_CLIENT_CONFIG_H
 
-#include "src/core/lib/client_config/lb_policy.h"
+#include "src/core/ext/client_config/lb_policy.h"
 
 /** Total configuration for a client. Provided, and updated, by
     grpc_resolver */
@@ -50,4 +50,4 @@ void grpc_client_config_set_lb_policy(grpc_client_config *client_config,
 grpc_lb_policy *grpc_client_config_get_lb_policy(
     grpc_client_config *client_config);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_CLIENT_CONFIG_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_CLIENT_CONFIG_H */
diff --git a/src/core/lib/client_config/connector.c b/src/core/ext/client_config/connector.c
index 4c7b823dac..5b629ed5fb 100644
--- a/src/core/lib/client_config/connector.c
+++ b/src/core/ext/client_config/connector.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/connector.h"
+#include "src/core/ext/client_config/connector.h"
 
 grpc_connector* grpc_connector_ref(grpc_connector* connector) {
   connector->vtable->ref(connector);
diff --git a/src/core/lib/client_config/connector.h b/src/core/ext/client_config/connector.h
index 39870a261c..dd85dfcb7d 100644
--- a/src/core/lib/client_config/connector.h
+++ b/src/core/ext/client_config/connector.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_CONNECTOR_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_CONNECTOR_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_CONNECTOR_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_CONNECTOR_H
 
 #include "src/core/lib/channel/channel_stack.h"
 #include "src/core/lib/iomgr/sockaddr.h"
@@ -89,4 +89,4 @@ void grpc_connector_connect(grpc_exec_ctx *exec_ctx, grpc_connector *connector,
 void grpc_connector_shutdown(grpc_exec_ctx *exec_ctx,
                              grpc_connector *connector);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_CONNECTOR_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_CONNECTOR_H */
diff --git a/src/core/lib/client_config/default_initial_connect_string.c b/src/core/ext/client_config/default_initial_connect_string.c
index a70da4a84a..a70da4a84a 100644
--- a/src/core/lib/client_config/default_initial_connect_string.c
+++ b/src/core/ext/client_config/default_initial_connect_string.c
diff --git a/src/core/lib/client_config/initial_connect_string.c b/src/core/ext/client_config/initial_connect_string.c
index 4034ea2e87..41580d2106 100644
--- a/src/core/lib/client_config/initial_connect_string.c
+++ b/src/core/ext/client_config/initial_connect_string.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/initial_connect_string.h"
+#include "src/core/ext/client_config/initial_connect_string.h"
 
 #include <stddef.h>
 
diff --git a/src/core/lib/client_config/initial_connect_string.h b/src/core/ext/client_config/initial_connect_string.h
index 51302768c6..06f0767832 100644
--- a/src/core/lib/client_config/initial_connect_string.h
+++ b/src/core/ext/client_config/initial_connect_string.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_INITIAL_CONNECT_STRING_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_INITIAL_CONNECT_STRING_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_INITIAL_CONNECT_STRING_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_INITIAL_CONNECT_STRING_H
 
 #include <grpc/support/slice.h>
 #include "src/core/lib/iomgr/sockaddr.h"
@@ -47,4 +47,4 @@ void grpc_test_set_initial_connect_string_function(
 void grpc_set_initial_connect_string(struct sockaddr **addr, size_t *addr_len,
                                      gpr_slice *connect_string);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_INITIAL_CONNECT_STRING_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_INITIAL_CONNECT_STRING_H */
diff --git a/src/core/lib/client_config/lb_policy.c b/src/core/ext/client_config/lb_policy.c
index 6174162d49..a7ad9842dc 100644
--- a/src/core/lib/client_config/lb_policy.c
+++ b/src/core/ext/client_config/lb_policy.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/lb_policy.h"
+#include "src/core/ext/client_config/lb_policy.h"
 
 #define WEAK_REF_BITS 16
 
diff --git a/src/core/lib/client_config/lb_policy.h b/src/core/ext/client_config/lb_policy.h
index 60729ef8f9..0384e0b2eb 100644
--- a/src/core/lib/client_config/lb_policy.h
+++ b/src/core/ext/client_config/lb_policy.h
@@ -31,10 +31,10 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_LB_POLICY_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_LB_POLICY_H
 
-#include "src/core/lib/client_config/subchannel.h"
+#include "src/core/ext/client_config/subchannel.h"
 #include "src/core/lib/transport/connectivity_state.h"
 
 /** A load balancing policy: specified by a vtable and a struct (which
@@ -154,4 +154,4 @@ void grpc_lb_policy_notify_on_state_change(grpc_exec_ctx *exec_ctx,
 grpc_connectivity_state grpc_lb_policy_check_connectivity(
     grpc_exec_ctx *exec_ctx, grpc_lb_policy *policy);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_LB_POLICY_H */
diff --git a/src/core/lib/client_config/lb_policy_factory.c b/src/core/ext/client_config/lb_policy_factory.c
index 92e1f5f08b..70e46ef3cf 100644
--- a/src/core/lib/client_config/lb_policy_factory.c
+++ b/src/core/ext/client_config/lb_policy_factory.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/lb_policy_factory.h"
+#include "src/core/ext/client_config/lb_policy_factory.h"
 
 void grpc_lb_policy_factory_ref(grpc_lb_policy_factory* factory) {
   factory->vtable->ref(factory);
diff --git a/src/core/lib/client_config/lb_policy_factory.h b/src/core/ext/client_config/lb_policy_factory.h
index 4931d4df58..1c89b28b59 100644
--- a/src/core/lib/client_config/lb_policy_factory.h
+++ b/src/core/ext/client_config/lb_policy_factory.h
@@ -31,11 +31,11 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_FACTORY_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_FACTORY_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_LB_POLICY_FACTORY_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_LB_POLICY_FACTORY_H
 
-#include "src/core/lib/client_config/client_channel_factory.h"
-#include "src/core/lib/client_config/lb_policy.h"
+#include "src/core/ext/client_config/client_channel_factory.h"
+#include "src/core/ext/client_config/lb_policy.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 
 #include "src/core/lib/iomgr/exec_ctx.h"
@@ -75,4 +75,4 @@ grpc_lb_policy *grpc_lb_policy_factory_create_lb_policy(
     grpc_exec_ctx *exec_ctx, grpc_lb_policy_factory *factory,
     grpc_lb_policy_args *args);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_FACTORY_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_LB_POLICY_FACTORY_H */
diff --git a/src/core/lib/client_config/lb_policy_registry.c b/src/core/ext/client_config/lb_policy_registry.c
index af396362a1..a23643ecc6 100644
--- a/src/core/lib/client_config/lb_policy_registry.c
+++ b/src/core/ext/client_config/lb_policy_registry.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/lb_policy_registry.h"
+#include "src/core/ext/client_config/lb_policy_registry.h"
 
 #include <string.h>
 
diff --git a/src/core/lib/client_config/lb_policy_registry.h b/src/core/ext/client_config/lb_policy_registry.h
index 4b8495d8a1..92f38d6de6 100644
--- a/src/core/lib/client_config/lb_policy_registry.h
+++ b/src/core/ext/client_config/lb_policy_registry.h
@@ -31,10 +31,10 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_REGISTRY_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_REGISTRY_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_LB_POLICY_REGISTRY_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_LB_POLICY_REGISTRY_H
 
-#include "src/core/lib/client_config/lb_policy_factory.h"
+#include "src/core/ext/client_config/lb_policy_factory.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
 
 /** Initialize the registry and set \a default_factory as the factory to be
@@ -52,4 +52,4 @@ void grpc_register_lb_policy(grpc_lb_policy_factory *factory);
 grpc_lb_policy *grpc_lb_policy_create(grpc_exec_ctx *exec_ctx, const char *name,
                                       grpc_lb_policy_args *args);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_REGISTRY_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_LB_POLICY_REGISTRY_H */
diff --git a/src/core/lib/client_config/resolver.c b/src/core/ext/client_config/resolver.c
index b9eef5575f..eb004455bd 100644
--- a/src/core/lib/client_config/resolver.c
+++ b/src/core/ext/client_config/resolver.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/resolver.h"
+#include "src/core/ext/client_config/resolver.h"
 
 void grpc_resolver_init(grpc_resolver *resolver,
                         const grpc_resolver_vtable *vtable) {
diff --git a/src/core/lib/client_config/resolver.h b/src/core/ext/client_config/resolver.h
index cf0bb2bc7a..6ecb5d2774 100644
--- a/src/core/lib/client_config/resolver.h
+++ b/src/core/ext/client_config/resolver.h
@@ -31,11 +31,11 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_RESOLVER_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_RESOLVER_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_RESOLVER_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_RESOLVER_H
 
-#include "src/core/lib/client_config/client_config.h"
-#include "src/core/lib/client_config/subchannel.h"
+#include "src/core/ext/client_config/client_config.h"
+#include "src/core/ext/client_config/subchannel.h"
 #include "src/core/lib/iomgr/iomgr.h"
 
 typedef struct grpc_resolver grpc_resolver;
@@ -91,4 +91,4 @@ void grpc_resolver_next(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver,
                         grpc_client_config **target_config,
                         grpc_closure *on_complete);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_RESOLVER_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_RESOLVER_H */
diff --git a/src/core/lib/client_config/resolver_factory.c b/src/core/ext/client_config/resolver_factory.c
index 001fa28536..67832dcf59 100644
--- a/src/core/lib/client_config/resolver_factory.c
+++ b/src/core/ext/client_config/resolver_factory.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/resolver_factory.h"
+#include "src/core/ext/client_config/resolver_factory.h"
 
 void grpc_resolver_factory_ref(grpc_resolver_factory* factory) {
   factory->vtable->ref(factory);
diff --git a/src/core/lib/client_config/resolver_factory.h b/src/core/ext/client_config/resolver_factory.h
index 18c7fd7d62..4eb6979aad 100644
--- a/src/core/lib/client_config/resolver_factory.h
+++ b/src/core/ext/client_config/resolver_factory.h
@@ -31,12 +31,12 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_RESOLVER_FACTORY_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_RESOLVER_FACTORY_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_RESOLVER_FACTORY_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_RESOLVER_FACTORY_H
 
-#include "src/core/lib/client_config/client_channel_factory.h"
-#include "src/core/lib/client_config/resolver.h"
-#include "src/core/lib/client_config/uri_parser.h"
+#include "src/core/ext/client_config/client_channel_factory.h"
+#include "src/core/ext/client_config/resolver.h"
+#include "src/core/ext/client_config/uri_parser.h"
 
 typedef struct grpc_resolver_factory grpc_resolver_factory;
 typedef struct grpc_resolver_factory_vtable grpc_resolver_factory_vtable;
@@ -79,4 +79,4 @@ grpc_resolver *grpc_resolver_factory_create_resolver(
 char *grpc_resolver_factory_get_default_authority(
     grpc_resolver_factory *factory, grpc_uri *uri);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_RESOLVER_FACTORY_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_RESOLVER_FACTORY_H */
diff --git a/src/core/lib/client_config/resolver_registry.c b/src/core/ext/client_config/resolver_registry.c
index 5584f6692e..07f29bcb27 100644
--- a/src/core/lib/client_config/resolver_registry.c
+++ b/src/core/ext/client_config/resolver_registry.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/resolver_registry.h"
+#include "src/core/ext/client_config/resolver_registry.h"
 
 #include <string.h>
 
diff --git a/src/core/lib/client_config/resolver_registry.h b/src/core/ext/client_config/resolver_registry.h
index b207313084..5ef1383cd3 100644
--- a/src/core/lib/client_config/resolver_registry.h
+++ b/src/core/ext/client_config/resolver_registry.h
@@ -31,10 +31,10 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_RESOLVER_REGISTRY_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_RESOLVER_REGISTRY_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_RESOLVER_REGISTRY_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_RESOLVER_REGISTRY_H
 
-#include "src/core/lib/client_config/resolver_factory.h"
+#include "src/core/ext/client_config/resolver_factory.h"
 
 void grpc_resolver_registry_init(const char *default_prefix);
 void grpc_resolver_registry_shutdown(void);
@@ -66,4 +66,4 @@ grpc_resolver_factory *grpc_resolver_factory_lookup(const char *name);
     representing the default authority to pass from a client. */
 char *grpc_get_default_authority(const char *target);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_RESOLVER_REGISTRY_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_RESOLVER_REGISTRY_H */
diff --git a/src/core/lib/client_config/subchannel.c b/src/core/ext/client_config/subchannel.c
index f44e2f7404..20cf245a5b 100644
--- a/src/core/lib/client_config/subchannel.c
+++ b/src/core/ext/client_config/subchannel.c
@@ -31,18 +31,18 @@
  *
  */
 
-#include "src/core/lib/client_config/subchannel.h"
+#include "src/core/ext/client_config/subchannel.h"
 
 #include <string.h>
 
 #include <grpc/support/alloc.h>
 #include <grpc/support/avl.h>
 
+#include "src/core/ext/client_config/client_channel.h"
+#include "src/core/ext/client_config/initial_connect_string.h"
+#include "src/core/ext/client_config/subchannel_index.h"
 #include "src/core/lib/channel/channel_args.h"
-#include "src/core/lib/channel/client_channel.h"
 #include "src/core/lib/channel/connected_channel.h"
-#include "src/core/lib/client_config/initial_connect_string.h"
-#include "src/core/lib/client_config/subchannel_index.h"
 #include "src/core/lib/iomgr/timer.h"
 #include "src/core/lib/profiling/timers.h"
 #include "src/core/lib/support/backoff.h"
diff --git a/src/core/lib/client_config/subchannel.h b/src/core/ext/client_config/subchannel.h
index 68aeff39a1..0765a544e8 100644
--- a/src/core/lib/client_config/subchannel.h
+++ b/src/core/ext/client_config/subchannel.h
@@ -31,11 +31,11 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_SUBCHANNEL_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_SUBCHANNEL_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_H
 
+#include "src/core/ext/client_config/connector.h"
 #include "src/core/lib/channel/channel_stack.h"
-#include "src/core/lib/client_config/connector.h"
 #include "src/core/lib/transport/connectivity_state.h"
 
 /** A (sub-)channel that knows how to connect to exactly one target
@@ -171,4 +171,4 @@ grpc_subchannel *grpc_subchannel_create(grpc_exec_ctx *exec_ctx,
                                         grpc_connector *connector,
                                         grpc_subchannel_args *args);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_SUBCHANNEL_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_H */
diff --git a/src/core/lib/channel/subchannel_call_holder.c b/src/core/ext/client_config/subchannel_call_holder.c
index a2686a380a..3db462b246 100644
--- a/src/core/lib/channel/subchannel_call_holder.c
+++ b/src/core/ext/client_config/subchannel_call_holder.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/channel/subchannel_call_holder.h"
+#include "src/core/ext/client_config/subchannel_call_holder.h"
 
 #include <grpc/support/alloc.h>
 
diff --git a/src/core/lib/channel/subchannel_call_holder.h b/src/core/ext/client_config/subchannel_call_holder.h
index 769e22b061..9299908788 100644
--- a/src/core/lib/channel/subchannel_call_holder.h
+++ b/src/core/ext/client_config/subchannel_call_holder.h
@@ -31,10 +31,10 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CHANNEL_SUBCHANNEL_CALL_HOLDER_H
-#define GRPC_CORE_LIB_CHANNEL_SUBCHANNEL_CALL_HOLDER_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_CALL_HOLDER_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_CALL_HOLDER_H
 
-#include "src/core/lib/client_config/subchannel.h"
+#include "src/core/ext/client_config/subchannel.h"
 
 /** Pick a subchannel for grpc_subchannel_call_holder;
     Return 1 if subchannel is available immediately (in which case on_ready
@@ -95,4 +95,4 @@ void grpc_subchannel_call_holder_perform_op(grpc_exec_ctx *exec_ctx,
 char *grpc_subchannel_call_holder_get_peer(grpc_exec_ctx *exec_ctx,
                                            grpc_subchannel_call_holder *holder);
 
-#endif /* GRPC_CORE_LIB_CHANNEL_SUBCHANNEL_CALL_HOLDER_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_CALL_HOLDER_H */
diff --git a/src/core/ext/client_config/subchannel_factory.c b/src/core/ext/client_config/subchannel_factory.c
new file mode 100644
index 0000000000..d1e4d75a02
--- /dev/null
+++ b/src/core/ext/client_config/subchannel_factory.c
@@ -0,0 +1,49 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+#include "src/core/ext/client_config/subchannel_factory.h"
+
+void grpc_subchannel_factory_ref(grpc_subchannel_factory* factory) {
+  factory->vtable->ref(factory);
+}
+
+void grpc_subchannel_factory_unref(grpc_exec_ctx* exec_ctx,
+                                   grpc_subchannel_factory* factory) {
+  factory->vtable->unref(exec_ctx, factory);
+}
+
+grpc_subchannel* grpc_subchannel_factory_create_subchannel(
+    grpc_exec_ctx* exec_ctx, grpc_subchannel_factory* factory,
+    grpc_subchannel_args* args) {
+  return factory->vtable->create_subchannel(exec_ctx, factory, args);
+}
diff --git a/src/core/ext/client_config/subchannel_factory.h b/src/core/ext/client_config/subchannel_factory.h
new file mode 100644
index 0000000000..0fb806d081
--- /dev/null
+++ b/src/core/ext/client_config/subchannel_factory.h
@@ -0,0 +1,66 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_FACTORY_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_FACTORY_H
+
+#include "src/core/ext/client_config/subchannel.h"
+#include "src/core/lib/channel/channel_stack.h"
+
+typedef struct grpc_subchannel_factory grpc_subchannel_factory;
+typedef struct grpc_subchannel_factory_vtable grpc_subchannel_factory_vtable;
+
+/** Constructor for new configured channels.
+    Creating decorators around this type is encouraged to adapt behavior. */
+struct grpc_subchannel_factory {
+  const grpc_subchannel_factory_vtable *vtable;
+};
+
+struct grpc_subchannel_factory_vtable {
+  void (*ref)(grpc_subchannel_factory *factory);
+  void (*unref)(grpc_exec_ctx *exec_ctx, grpc_subchannel_factory *factory);
+  grpc_subchannel *(*create_subchannel)(grpc_exec_ctx *exec_ctx,
+                                        grpc_subchannel_factory *factory,
+                                        grpc_subchannel_args *args);
+};
+
+void grpc_subchannel_factory_ref(grpc_subchannel_factory *factory);
+void grpc_subchannel_factory_unref(grpc_exec_ctx *exec_ctx,
+                                   grpc_subchannel_factory *factory);
+
+/** Create a new grpc_subchannel */
+grpc_subchannel *grpc_subchannel_factory_create_subchannel(
+    grpc_exec_ctx *exec_ctx, grpc_subchannel_factory *factory,
+    grpc_subchannel_args *args);
+
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_FACTORY_H */
diff --git a/src/core/lib/client_config/subchannel_index.c b/src/core/ext/client_config/subchannel_index.c
index 2c545002a2..ab8d9bd91d 100644
--- a/src/core/lib/client_config/subchannel_index.c
+++ b/src/core/ext/client_config/subchannel_index.c
@@ -31,7 +31,7 @@
 //
 //
 
-#include "src/core/lib/client_config/subchannel_index.h"
+#include "src/core/ext/client_config/subchannel_index.h"
 
 #include <stdbool.h>
 #include <string.h>
diff --git a/src/core/lib/client_config/subchannel_index.h b/src/core/ext/client_config/subchannel_index.h
index bc5f03beb4..6b8d063855 100644
--- a/src/core/lib/client_config/subchannel_index.h
+++ b/src/core/ext/client_config/subchannel_index.h
@@ -31,11 +31,11 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_SUBCHANNEL_INDEX_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_SUBCHANNEL_INDEX_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_INDEX_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_INDEX_H
 
-#include "src/core/lib/client_config/connector.h"
-#include "src/core/lib/client_config/subchannel.h"
+#include "src/core/ext/client_config/connector.h"
+#include "src/core/ext/client_config/subchannel.h"
 
 /** \file Provides an index of active subchannels so that they can be
     shared amongst channels */
@@ -74,4 +74,4 @@ void grpc_subchannel_index_init(void);
 /** Shutdown the subchannel index (global) */
 void grpc_subchannel_index_shutdown(void);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_SUBCHANNEL_INDEX_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_INDEX_H */
diff --git a/src/core/lib/client_config/uri_parser.c b/src/core/ext/client_config/uri_parser.c
index 6bec70da2d..3ca1a58e69 100644
--- a/src/core/lib/client_config/uri_parser.c
+++ b/src/core/ext/client_config/uri_parser.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/uri_parser.h"
+#include "src/core/ext/client_config/uri_parser.h"
 
 #include <string.h>
 
diff --git a/src/core/lib/client_config/uri_parser.h b/src/core/ext/client_config/uri_parser.h
index 5d6785d293..875a7cb07c 100644
--- a/src/core/lib/client_config/uri_parser.h
+++ b/src/core/ext/client_config/uri_parser.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_URI_PARSER_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_URI_PARSER_H
+#ifndef GRPC_CORE_EXT_CLIENT_CONFIG_URI_PARSER_H
+#define GRPC_CORE_EXT_CLIENT_CONFIG_URI_PARSER_H
 
 #include <stddef.h>
 
@@ -60,4 +60,4 @@ const char *grpc_uri_get_query_arg(const grpc_uri *uri, const char *key);
 /** destroy a uri */
 void grpc_uri_destroy(grpc_uri *uri);
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_URI_PARSER_H */
+#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_URI_PARSER_H */
diff --git a/src/core/ext/lb_policy/grpclb/load_balancer_api.c b/src/core/ext/lb_policy/grpclb/load_balancer_api.c
index d8af644870..459d6d9954 100644
--- a/src/core/ext/lb_policy/grpclb/load_balancer_api.c
+++ b/src/core/ext/lb_policy/grpclb/load_balancer_api.c
@@ -110,13 +110,15 @@ grpc_grpclb_response *grpc_grpclb_response_parse(gpr_slice encoded_response) {
   grpc_grpclb_response *res = gpr_malloc(sizeof(grpc_grpclb_response));
   memset(res, 0, sizeof(*res));
   status = pb_decode(&stream, grpc_lb_v0_LoadBalanceResponse_fields, res);
-  GPR_ASSERT(status == true);
+  if (!status) {
+    grpc_grpclb_response_destroy(res);
+    return NULL;
+  }
   return res;
 }
 
 grpc_grpclb_serverlist *grpc_grpclb_response_parse_serverlist(
     gpr_slice encoded_response) {
-  grpc_grpclb_serverlist *sl = gpr_malloc(sizeof(grpc_grpclb_serverlist));
   bool status;
   decode_serverlist_arg arg;
   pb_istream_t stream =
@@ -131,15 +133,20 @@ grpc_grpclb_serverlist *grpc_grpclb_response_parse_serverlist(
   res->server_list.servers.arg = &arg;
   arg.first_pass = 1;
   status = pb_decode(&stream, grpc_lb_v0_LoadBalanceResponse_fields, res);
-  GPR_ASSERT(status == true);
-  GPR_ASSERT(arg.num_servers > 0);
+  if (!status) {
+    grpc_grpclb_response_destroy(res);
+    return NULL;
+  }
 
   arg.first_pass = 0;
   status =
       pb_decode(&stream_at_start, grpc_lb_v0_LoadBalanceResponse_fields, res);
-  GPR_ASSERT(status == true);
-  GPR_ASSERT(arg.servers != NULL);
+  if (!status) {
+    grpc_grpclb_response_destroy(res);
+    return NULL;
+  }
 
+  grpc_grpclb_serverlist *sl = gpr_malloc(sizeof(grpc_grpclb_serverlist));
   sl->num_servers = arg.num_servers;
   sl->servers = arg.servers;
   if (res->server_list.has_expiration_interval) {
@@ -150,8 +157,10 @@ grpc_grpclb_serverlist *grpc_grpclb_response_parse_serverlist(
 }
 
 void grpc_grpclb_destroy_serverlist(grpc_grpclb_serverlist *serverlist) {
-  size_t i;
-  for (i = 0; i < serverlist->num_servers; i++) {
+  if (serverlist == NULL) {
+    return;
+  }
+  for (size_t i = 0; i < serverlist->num_servers; i++) {
     gpr_free(serverlist->servers[i]);
   }
   gpr_free(serverlist->servers);
diff --git a/src/core/ext/lb_policy/grpclb/load_balancer_api.h b/src/core/ext/lb_policy/grpclb/load_balancer_api.h
index d329a2ffe8..968f7d278a 100644
--- a/src/core/ext/lb_policy/grpclb/load_balancer_api.h
+++ b/src/core/ext/lb_policy/grpclb/load_balancer_api.h
@@ -36,8 +36,8 @@
 
 #include <grpc/support/slice_buffer.h>
 
+#include "src/core/ext/client_config/lb_policy_factory.h"
 #include "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h"
-#include "src/core/lib/client_config/lb_policy_factory.h"
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/src/core/ext/lb_policy/pick_first/pick_first.c b/src/core/ext/lb_policy/pick_first/pick_first.c
index 43197c1191..5926f9d70b 100644
--- a/src/core/ext/lb_policy/pick_first/pick_first.c
+++ b/src/core/ext/lb_policy/pick_first/pick_first.c
@@ -34,7 +34,7 @@
 #include <string.h>
 
 #include <grpc/support/alloc.h>
-#include "src/core/lib/client_config/lb_policy_registry.h"
+#include "src/core/ext/client_config/lb_policy_registry.h"
 #include "src/core/lib/transport/connectivity_state.h"
 
 typedef struct pending_pick {
diff --git a/src/core/ext/lb_policy/round_robin/round_robin.c b/src/core/ext/lb_policy/round_robin/round_robin.c
index eac6971099..3f6051b892 100644
--- a/src/core/ext/lb_policy/round_robin/round_robin.c
+++ b/src/core/ext/lb_policy/round_robin/round_robin.c
@@ -35,7 +35,7 @@
 
 #include <grpc/support/alloc.h>
 
-#include "src/core/lib/client_config/lb_policy_registry.h"
+#include "src/core/ext/client_config/lb_policy_registry.h"
 #include "src/core/lib/debug/trace.h"
 #include "src/core/lib/transport/connectivity_state.h"
 
diff --git a/src/core/ext/resolver/dns/native/dns_resolver.c b/src/core/ext/resolver/dns/native/dns_resolver.c
index 1a0bf305d6..2749b0ca01 100644
--- a/src/core/ext/resolver/dns/native/dns_resolver.c
+++ b/src/core/ext/resolver/dns/native/dns_resolver.c
@@ -37,8 +37,8 @@
 #include <grpc/support/host_port.h>
 #include <grpc/support/string_util.h>
 
-#include "src/core/lib/client_config/lb_policy_registry.h"
-#include "src/core/lib/client_config/resolver_registry.h"
+#include "src/core/ext/client_config/lb_policy_registry.h"
+#include "src/core/ext/client_config/resolver_registry.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/iomgr/timer.h"
 #include "src/core/lib/support/backoff.h"
diff --git a/src/core/ext/resolver/sockaddr/sockaddr_resolver.c b/src/core/ext/resolver/sockaddr/sockaddr_resolver.c
index 76c03c08b5..1f14b40e18 100644
--- a/src/core/ext/resolver/sockaddr/sockaddr_resolver.c
+++ b/src/core/ext/resolver/sockaddr/sockaddr_resolver.c
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -40,8 +40,8 @@
 #include <grpc/support/port_platform.h>
 #include <grpc/support/string_util.h>
 
-#include "src/core/lib/client_config/lb_policy_registry.h"
-#include "src/core/lib/client_config/resolver_registry.h"
+#include "src/core/ext/client_config/lb_policy_registry.h"
+#include "src/core/ext/client_config/resolver_registry.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/iomgr/unix_sockets_posix.h"
 #include "src/core/lib/support/string.h"
diff --git a/src/core/ext/resolver/zookeeper/zookeeper_resolver.c b/src/core/ext/resolver/zookeeper/zookeeper_resolver.c
index 91153f14b5..898632c3cd 100644
--- a/src/core/ext/resolver/zookeeper/zookeeper_resolver.c
+++ b/src/core/ext/resolver/zookeeper/zookeeper_resolver.c
@@ -39,8 +39,8 @@
 #include <grpc/grpc_zookeeper.h>
 #include <zookeeper/zookeeper.h>
 
-#include "src/core/lib/client_config/lb_policy_registry.h"
-#include "src/core/lib/client_config/resolver_registry.h"
+#include "src/core/ext/client_config/lb_policy_registry.h"
+#include "src/core/ext/client_config/resolver_registry.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/json/json.h"
 #include "src/core/lib/support/string.h"
diff --git a/src/core/ext/transport/chttp2/client/insecure/channel_create.c b/src/core/ext/transport/chttp2/client/insecure/channel_create.c
index ee2ac44978..5484438f0a 100644
--- a/src/core/ext/transport/chttp2/client/insecure/channel_create.c
+++ b/src/core/ext/transport/chttp2/client/insecure/channel_create.c
@@ -41,12 +41,12 @@
 #include <grpc/support/slice_buffer.h>
 
 #include "src/core/ext/census/grpc_filter.h"
+#include "src/core/ext/client_config/client_channel.h"
+#include "src/core/ext/client_config/resolver_registry.h"
 #include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 #include "src/core/lib/channel/channel_args.h"
-#include "src/core/lib/channel/client_channel.h"
 #include "src/core/lib/channel/compress_filter.h"
 #include "src/core/lib/channel/http_client_filter.h"
-#include "src/core/lib/client_config/resolver_registry.h"
 #include "src/core/lib/iomgr/tcp_client.h"
 #include "src/core/lib/surface/api_trace.h"
 #include "src/core/lib/surface/channel.h"
diff --git a/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c b/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c
index 5d30805639..58af6f995a 100644
--- a/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c
+++ b/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c
@@ -40,10 +40,10 @@
 #include <grpc/support/slice.h>
 #include <grpc/support/slice_buffer.h>
 
+#include "src/core/ext/client_config/client_channel.h"
+#include "src/core/ext/client_config/resolver_registry.h"
 #include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 #include "src/core/lib/channel/channel_args.h"
-#include "src/core/lib/channel/client_channel.h"
-#include "src/core/lib/client_config/resolver_registry.h"
 #include "src/core/lib/iomgr/tcp_client.h"
 #include "src/core/lib/security/auth_filters.h"
 #include "src/core/lib/security/credentials.h"
diff --git a/src/core/ext/transport/chttp2/transport/chttp2_transport.c b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
index 62f0c53e0d..b4cd185e62 100644
--- a/src/core/ext/transport/chttp2/transport/chttp2_transport.c
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
@@ -1147,16 +1147,18 @@ static void cancel_from_api(grpc_exec_ctx *exec_ctx,
                             grpc_chttp2_transport_global *transport_global,
                             grpc_chttp2_stream_global *stream_global,
                             grpc_status_code status) {
-  if (stream_global->id != 0) {
-    gpr_slice_buffer_add(
-        &transport_global->qbuf,
-        grpc_chttp2_rst_stream_create(
-            stream_global->id,
-            (uint32_t)grpc_chttp2_grpc_status_to_http2_error(status),
-            &stream_global->stats.outgoing));
+  if (!stream_global->read_closed || !stream_global->write_closed) {
+    if (stream_global->id != 0) {
+      gpr_slice_buffer_add(
+          &transport_global->qbuf,
+          grpc_chttp2_rst_stream_create(
+              stream_global->id,
+              (uint32_t)grpc_chttp2_grpc_status_to_http2_error(status),
+              &stream_global->stats.outgoing));
+    }
+    grpc_chttp2_fake_status(exec_ctx, transport_global, stream_global, status,
+                            NULL);
   }
-  grpc_chttp2_fake_status(exec_ctx, transport_global, stream_global, status,
-                          NULL);
   grpc_chttp2_mark_stream_closed(exec_ctx, transport_global, stream_global, 1,
                                  1);
 }
diff --git a/src/core/ext/transport/chttp2/transport/parsing.c b/src/core/ext/transport/chttp2/transport/parsing.c
index c754c6005e..e827a43f7a 100644
--- a/src/core/ext/transport/chttp2/transport/parsing.c
+++ b/src/core/ext/transport/chttp2/transport/parsing.c
@@ -112,7 +112,7 @@ void grpc_chttp2_publish_reads(
      GOAWAY last-grpc_chttp2_stream-id=0 in this case. */
   if (!transport_parsing->is_client) {
     transport_global->last_incoming_stream_id =
-        transport_parsing->incoming_stream_id;
+        transport_parsing->last_incoming_stream_id;
   }
 
   /* update global settings */
@@ -371,7 +371,9 @@ int grpc_chttp2_perform_read(grpc_exec_ctx *exec_ctx,
       if (!init_frame_parser(exec_ctx, transport_parsing)) {
         return 0;
       }
-      if (transport_parsing->incoming_stream_id) {
+      if (transport_parsing->incoming_stream_id != 0 &&
+          transport_parsing->incoming_stream_id >
+              transport_parsing->last_incoming_stream_id) {
         transport_parsing->last_incoming_stream_id =
             transport_parsing->incoming_stream_id;
       }
diff --git a/src/core/lib/iomgr/unix_sockets_posix.h b/src/core/lib/iomgr/unix_sockets_posix.h
index 752cab85a5..22d6af5044 100644
--- a/src/core/lib/iomgr/unix_sockets_posix.h
+++ b/src/core/lib/iomgr/unix_sockets_posix.h
@@ -38,8 +38,8 @@
 
 #include <grpc/support/string_util.h>
 
-#include "src/core/lib/client_config/resolver_factory.h"
-#include "src/core/lib/client_config/uri_parser.h"
+#include "src/core/ext/client_config/resolver_factory.h"
+#include "src/core/ext/client_config/uri_parser.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/iomgr/sockaddr.h"
 
diff --git a/src/core/lib/surface/call.c b/src/core/lib/surface/call.c
index ba94852f9a..6581bbd3d1 100644
--- a/src/core/lib/surface/call.c
+++ b/src/core/lib/surface/call.c
@@ -1074,24 +1074,29 @@ static void receiving_initial_metadata_ready(grpc_exec_ctx *exec_ctx,
 
   gpr_mu_lock(&call->mu);
 
-  grpc_metadata_batch *md =
-      &call->metadata_batch[1 /* is_receiving */][0 /* is_trailing */];
-  grpc_metadata_batch_filter(md, recv_initial_filter, call);
-  call->has_initial_md_been_received = true;
-
-  if (gpr_time_cmp(md->deadline, gpr_inf_future(md->deadline.clock_type)) !=
-          0 &&
-      !call->is_client) {
-    GPR_TIMER_BEGIN("set_deadline_alarm", 0);
-    set_deadline_alarm(exec_ctx, call, md->deadline);
-    GPR_TIMER_END("set_deadline_alarm", 0);
+  if (!success) {
+    bctl->success = false;
+  } else {
+    grpc_metadata_batch *md =
+        &call->metadata_batch[1 /* is_receiving */][0 /* is_trailing */];
+    grpc_metadata_batch_filter(md, recv_initial_filter, call);
+
+    if (gpr_time_cmp(md->deadline, gpr_inf_future(md->deadline.clock_type)) !=
+            0 &&
+        !call->is_client) {
+      GPR_TIMER_BEGIN("set_deadline_alarm", 0);
+      set_deadline_alarm(exec_ctx, call, md->deadline);
+      GPR_TIMER_END("set_deadline_alarm", 0);
+    }
   }
 
+  call->has_initial_md_been_received = true;
   if (call->saved_receiving_stream_ready_ctx.bctlp != NULL) {
     grpc_closure *saved_rsr_closure = grpc_closure_create(
         receiving_stream_ready, call->saved_receiving_stream_ready_ctx.bctlp);
-    grpc_exec_ctx_enqueue(exec_ctx, saved_rsr_closure,
-                          call->saved_receiving_stream_ready_ctx.success, NULL);
+    grpc_exec_ctx_enqueue(
+        exec_ctx, saved_rsr_closure,
+        call->saved_receiving_stream_ready_ctx.success && success, NULL);
     call->saved_receiving_stream_ready_ctx.bctlp = NULL;
   }
 
diff --git a/src/core/lib/surface/channel.c b/src/core/lib/surface/channel.c
index 06f991b085..332f504507 100644
--- a/src/core/lib/surface/channel.c
+++ b/src/core/lib/surface/channel.c
@@ -40,7 +40,7 @@
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 
-#include "src/core/lib/client_config/resolver_registry.h"
+#include "src/core/ext/client_config/resolver_registry.h"
 #include "src/core/lib/iomgr/iomgr.h"
 #include "src/core/lib/support/string.h"
 #include "src/core/lib/surface/api_trace.h"
diff --git a/src/core/lib/surface/channel.h b/src/core/lib/surface/channel.h
index 68afac6fac..22dae930e4 100644
--- a/src/core/lib/surface/channel.h
+++ b/src/core/lib/surface/channel.h
@@ -35,7 +35,6 @@
 #define GRPC_CORE_LIB_SURFACE_CHANNEL_H
 
 #include "src/core/lib/channel/channel_stack.h"
-#include "src/core/lib/client_config/client_channel_factory.h"
 #include "src/core/lib/surface/channel_stack_type.h"
 
 grpc_channel *grpc_channel_create(grpc_exec_ctx *exec_ctx, const char *target,
diff --git a/src/core/lib/surface/init.c b/src/core/lib/surface/init.c
index aca4ce9d07..f221d8db35 100644
--- a/src/core/lib/surface/init.c
+++ b/src/core/lib/surface/init.c
@@ -39,17 +39,17 @@
 #include <grpc/grpc.h>
 #include <grpc/support/alloc.h>
 #include <grpc/support/time.h>
+#include "src/core/ext/client_config/client_channel.h"
+#include "src/core/ext/client_config/lb_policy_registry.h"
+#include "src/core/ext/client_config/resolver_registry.h"
+#include "src/core/ext/client_config/subchannel.h"
+#include "src/core/ext/client_config/subchannel_index.h"
 #include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 #include "src/core/lib/channel/channel_stack.h"
-#include "src/core/lib/channel/client_channel.h"
 #include "src/core/lib/channel/compress_filter.h"
 #include "src/core/lib/channel/connected_channel.h"
 #include "src/core/lib/channel/http_client_filter.h"
 #include "src/core/lib/channel/http_server_filter.h"
-#include "src/core/lib/client_config/lb_policy_registry.h"
-#include "src/core/lib/client_config/resolver_registry.h"
-#include "src/core/lib/client_config/subchannel.h"
-#include "src/core/lib/client_config/subchannel_index.h"
 #include "src/core/lib/debug/trace.h"
 #include "src/core/lib/iomgr/executor.h"
 #include "src/core/lib/iomgr/iomgr.h"
diff --git a/src/core/lib/surface/server.c b/src/core/lib/surface/server.c
index 37cc2bd101..ad8ee8c7a9 100644
--- a/src/core/lib/surface/server.c
+++ b/src/core/lib/surface/server.c
@@ -685,10 +685,14 @@ static grpc_mdelem *server_filter(void *user_data, grpc_mdelem *md) {
   grpc_call_element *elem = user_data;
   call_data *calld = elem->call_data;
   if (md->key == GRPC_MDSTR_PATH) {
-    calld->path = GRPC_MDSTR_REF(md->value);
+    if (calld->path == NULL) {
+      calld->path = GRPC_MDSTR_REF(md->value);
+    }
     return NULL;
   } else if (md->key == GRPC_MDSTR_AUTHORITY) {
-    calld->host = GRPC_MDSTR_REF(md->value);
+    if (calld->host == NULL) {
+      calld->host = GRPC_MDSTR_REF(md->value);
+    }
     return NULL;
   }
   return md;
diff --git a/src/core/lib/transport/metadata.c b/src/core/lib/transport/metadata.c
index d358bea76f..5d9e7e74c1 100644
--- a/src/core/lib/transport/metadata.c
+++ b/src/core/lib/transport/metadata.c
@@ -246,6 +246,12 @@ void grpc_mdctx_global_shutdown(void) {
     if (shard->count != 0) {
       gpr_log(GPR_DEBUG, "WARNING: %d metadata strings were leaked",
               shard->count);
+      for (size_t j = 0; j < shard->capacity; j++) {
+        for (internal_string *s = shard->strs[j]; s; s = s->bucket_next) {
+          gpr_log(GPR_DEBUG, "LEAKED: %s",
+                  grpc_mdstr_as_c_string((grpc_mdstr *)s));
+        }
+      }
       if (grpc_iomgr_abort_on_leaks()) {
         abort();
       }
diff --git a/src/core/lib/transport/transport.h b/src/core/lib/transport/transport.h
index bb1120ee3a..1eb446312b 100644
--- a/src/core/lib/transport/transport.h
+++ b/src/core/lib/transport/transport.h
@@ -50,7 +50,7 @@ typedef struct grpc_transport grpc_transport;
    for a stream. */
 typedef struct grpc_stream grpc_stream;
 
-/*#define GRPC_STREAM_REFCOUNT_DEBUG*/
+//#define GRPC_STREAM_REFCOUNT_DEBUG
 
 typedef struct grpc_stream_refcount {
   gpr_refcount refs;
diff --git a/src/node/stress/stress_client.js b/src/node/stress/stress_client.js
index 8332652e2a..6054d3a253 100644
--- a/src/node/stress/stress_client.js
+++ b/src/node/stress/stress_client.js
@@ -102,7 +102,7 @@ function main() {
   var argv = parseArgs(process.argv, {
     string: ['server_addresses', 'test_cases', 'metrics_port'],
     default: {'server_addresses': 'localhost:8080',
-              'test_duration-secs': -1,
+              'test_duration_secs': -1,
               'num_channels_per_server': 1,
               'num_stubs_per_channel': 1,
               'metrics_port': '8081'}
@@ -118,8 +118,8 @@ function main() {
   }));
   start(server_addresses, test_cases, argv.num_channels_per_server,
         argv.num_stubs_per_channel, argv.metrics_port);
-  if (argv['test_duration-secs'] > -1) {
-    setTimeout(stop, argv['test_duration-secs'] * 1000);
+  if (argv.test_duration_secs > -1) {
+    setTimeout(stop, argv.test_duration_secs * 1000);
   }
 }
 
diff --git a/src/proto/grpc/testing/control.proto b/src/proto/grpc/testing/control.proto
index 11e752a74b..458b19c4d6 100644
--- a/src/proto/grpc/testing/control.proto
+++ b/src/proto/grpc/testing/control.proto
@@ -169,3 +169,28 @@ message CoreResponse {
 
 message Void {
 }
+
+// A single performance scenario: input to qps_json_driver
+message Scenario {
+  // Human readable name for this scenario
+  string name = 1;
+  // Client configuration
+  ClientConfig client_config = 2;
+  // Number of clients to start for the test
+  int32 num_clients = 3;
+  // Server configuration
+  ServerConfig server_config = 4;
+  // Number of servers to start for the test
+  int32 num_servers = 5;
+  // Warmup period, in seconds
+  int32 warmup_seconds = 6;
+  // Benchmark time, in seconds
+  int32 benchmark_seconds = 7;
+  // Number of workers to spawn locally (usually zero)
+  int32 spawn_local_worker_count = 8;
+}
+
+// A set of scenarios to be run with qps_json_driver
+message Scenarios {
+  repeated Scenario scenarios = 1;
+}
diff --git a/src/proto/grpc/testing/metrics.proto b/src/proto/grpc/testing/metrics.proto
index 0cc4b60239..1202b20b8f 100644
--- a/src/proto/grpc/testing/metrics.proto
+++ b/src/proto/grpc/testing/metrics.proto
@@ -1,4 +1,4 @@
-// Copyright 2015, Google Inc.
+// Copyright 2015-2016, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
@@ -42,7 +42,7 @@ message GaugeResponse {
   string name = 1;
   oneof value {
     int64 long_value = 2;
-    double double_vale = 3;
+    double double_value = 3;
     string string_value = 4;
   }
 }
diff --git a/src/python/grpcio/grpc_core_dependencies.py b/src/python/grpcio/grpc_core_dependencies.py
index 3452e3a0f5..2ed0b1e520 100644
--- a/src/python/grpcio/grpc_core_dependencies.py
+++ b/src/python/grpcio/grpc_core_dependencies.py
@@ -83,6 +83,23 @@ CORE_SOURCE_FILES = [
   'src/core/ext/census/operation.c',
   'src/core/ext/census/placeholders.c',
   'src/core/ext/census/tracing.c',
+  'src/core/ext/client_config/channel_connectivity.c',
+  'src/core/ext/client_config/client_channel.c',
+  'src/core/ext/client_config/client_channel_factory.c',
+  'src/core/ext/client_config/client_config.c',
+  'src/core/ext/client_config/connector.c',
+  'src/core/ext/client_config/default_initial_connect_string.c',
+  'src/core/ext/client_config/initial_connect_string.c',
+  'src/core/ext/client_config/lb_policy.c',
+  'src/core/ext/client_config/lb_policy_factory.c',
+  'src/core/ext/client_config/lb_policy_registry.c',
+  'src/core/ext/client_config/resolver.c',
+  'src/core/ext/client_config/resolver_factory.c',
+  'src/core/ext/client_config/resolver_registry.c',
+  'src/core/ext/client_config/subchannel.c',
+  'src/core/ext/client_config/subchannel_call_holder.c',
+  'src/core/ext/client_config/subchannel_index.c',
+  'src/core/ext/client_config/uri_parser.c',
   'src/core/ext/lb_policy/grpclb/load_balancer_api.c',
   'src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c',
   'src/core/ext/lb_policy/pick_first/pick_first.c',
@@ -117,26 +134,10 @@ CORE_SOURCE_FILES = [
   'src/core/lib/channel/channel_args.c',
   'src/core/lib/channel/channel_stack.c',
   'src/core/lib/channel/channel_stack_builder.c',
-  'src/core/lib/channel/client_channel.c',
   'src/core/lib/channel/compress_filter.c',
   'src/core/lib/channel/connected_channel.c',
   'src/core/lib/channel/http_client_filter.c',
   'src/core/lib/channel/http_server_filter.c',
-  'src/core/lib/channel/subchannel_call_holder.c',
-  'src/core/lib/client_config/client_channel_factory.c',
-  'src/core/lib/client_config/client_config.c',
-  'src/core/lib/client_config/connector.c',
-  'src/core/lib/client_config/default_initial_connect_string.c',
-  'src/core/lib/client_config/initial_connect_string.c',
-  'src/core/lib/client_config/lb_policy.c',
-  'src/core/lib/client_config/lb_policy_factory.c',
-  'src/core/lib/client_config/lb_policy_registry.c',
-  'src/core/lib/client_config/resolver.c',
-  'src/core/lib/client_config/resolver_factory.c',
-  'src/core/lib/client_config/resolver_registry.c',
-  'src/core/lib/client_config/subchannel.c',
-  'src/core/lib/client_config/subchannel_index.c',
-  'src/core/lib/client_config/uri_parser.c',
   'src/core/lib/compression/compression_algorithm.c',
   'src/core/lib/compression/message_compress.c',
   'src/core/lib/debug/trace.c',
@@ -209,7 +210,6 @@ CORE_SOURCE_FILES = [
   'src/core/lib/surface/call_details.c',
   'src/core/lib/surface/call_log_batch.c',
   'src/core/lib/surface/channel.c',
-  'src/core/lib/surface/channel_connectivity.c',
   'src/core/lib/surface/channel_init.c',
   'src/core/lib/surface/channel_ping.c',
   'src/core/lib/surface/channel_stack_type.c',