Merge github.com:grpc/grpc into copyright-fix

12 files changed, 14 insertions, 1659 deletions

diff --git a/src/core/lib/client_config/lb_policies/load_balancer_api.c b/src/core/lib/client_config/lb_policies/load_balancer_api.c
deleted file mode 100644
index 4cbed200df..0000000000
--- a/src/core/lib/client_config/lb_policies/load_balancer_api.c
+++ /dev/null
@@ -1,163 +0,0 @@
-/*
- *
- * Copyright 2016, 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/lib/client_config/lb_policies/load_balancer_api.h"
-#include "third_party/nanopb/pb_decode.h"
-#include "third_party/nanopb/pb_encode.h"
-
-#include <grpc/support/alloc.h>
-
-typedef struct decode_serverlist_arg {
-  int first_pass;
-  int i;
-  size_t num_servers;
-  grpc_grpclb_server **servers;
-} decode_serverlist_arg;
-
-/* invoked once for every Server in ServerList */
-static bool decode_serverlist(pb_istream_t *stream, const pb_field_t *field,
-                              void **arg) {
-  decode_serverlist_arg *dec_arg = *arg;
-  if (dec_arg->first_pass != 0) { /* first pass */
-    grpc_grpclb_server server;
-    if (!pb_decode(stream, grpc_lb_v0_Server_fields, &server)) {
-      return false;
-    }
-    dec_arg->num_servers++;
-  } else { /* second pass */
-    grpc_grpclb_server *server = gpr_malloc(sizeof(grpc_grpclb_server));
-    GPR_ASSERT(dec_arg->num_servers > 0);
-    if (dec_arg->i == 0) { /* first iteration of second pass */
-      dec_arg->servers =
-          gpr_malloc(sizeof(grpc_grpclb_server *) * dec_arg->num_servers);
-    }
-    if (!pb_decode(stream, grpc_lb_v0_Server_fields, server)) {
-      return false;
-    }
-    dec_arg->servers[dec_arg->i++] = server;
-  }
-
-  return true;
-}
-
-grpc_grpclb_request *grpc_grpclb_request_create(const char *lb_service_name) {
-  grpc_grpclb_request *req = gpr_malloc(sizeof(grpc_grpclb_request));
-
-  req->has_client_stats = 0; /* TODO(dgq): add support for stats once defined */
-  req->has_initial_request = 1;
-  req->initial_request.has_name = 1;
-  strncpy(req->initial_request.name, lb_service_name,
-          GRPC_GRPCLB_SERVICE_NAME_MAX_LENGTH);
-  return req;
-}
-
-gpr_slice grpc_grpclb_request_encode(const grpc_grpclb_request *request) {
-  size_t encoded_length;
-  pb_ostream_t sizestream;
-  pb_ostream_t outputstream;
-  gpr_slice slice;
-  memset(&sizestream, 0, sizeof(pb_ostream_t));
-  pb_encode(&sizestream, grpc_lb_v0_LoadBalanceRequest_fields, request);
-  encoded_length = sizestream.bytes_written;
-
-  slice = gpr_slice_malloc(encoded_length);
-  outputstream =
-      pb_ostream_from_buffer(GPR_SLICE_START_PTR(slice), encoded_length);
-  GPR_ASSERT(pb_encode(&outputstream, grpc_lb_v0_LoadBalanceRequest_fields,
-                       request) != 0);
-  return slice;
-}
-
-void grpc_grpclb_request_destroy(grpc_grpclb_request *request) {
-  gpr_free(request);
-}
-
-grpc_grpclb_response *grpc_grpclb_response_parse(gpr_slice encoded_response) {
-  bool status;
-  pb_istream_t stream =
-      pb_istream_from_buffer(GPR_SLICE_START_PTR(encoded_response),
-                             GPR_SLICE_LENGTH(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);
-  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 =
-      pb_istream_from_buffer(GPR_SLICE_START_PTR(encoded_response),
-                             GPR_SLICE_LENGTH(encoded_response));
-  pb_istream_t stream_at_start = stream;
-  grpc_grpclb_response *res = gpr_malloc(sizeof(grpc_grpclb_response));
-  memset(res, 0, sizeof(*res));
-  memset(&arg, 0, sizeof(decode_serverlist_arg));
-
-  res->server_list.servers.funcs.decode = decode_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);
-
-  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);
-
-  sl->num_servers = arg.num_servers;
-  sl->servers = arg.servers;
-  if (res->server_list.has_expiration_interval) {
-    sl->expiration_interval = res->server_list.expiration_interval;
-  }
-  grpc_grpclb_response_destroy(res);
-  return sl;
-}
-
-void grpc_grpclb_destroy_serverlist(grpc_grpclb_serverlist *serverlist) {
-  size_t i;
-  for (i = 0; i < serverlist->num_servers; i++) {
-    gpr_free(serverlist->servers[i]);
-  }
-  gpr_free(serverlist->servers);
-  gpr_free(serverlist);
-}
-
-void grpc_grpclb_response_destroy(grpc_grpclb_response *response) {
-  gpr_free(response);
-}
diff --git a/src/core/lib/client_config/lb_policies/load_balancer_api.h b/src/core/lib/client_config/lb_policies/load_balancer_api.h
deleted file mode 100644
index 83299adfa9..0000000000
--- a/src/core/lib/client_config/lb_policies/load_balancer_api.h
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- *
- * Copyright 2016, 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_LIB_CLIENT_CONFIG_LB_POLICIES_LOAD_BALANCER_API_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_LOAD_BALANCER_API_H
-
-#include <grpc/support/slice_buffer.h>
-
-#include "src/core/lib/client_config/lb_policy_factory.h"
-#include "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define GRPC_GRPCLB_SERVICE_NAME_MAX_LENGTH 128
-
-typedef grpc_lb_v0_LoadBalanceRequest grpc_grpclb_request;
-typedef grpc_lb_v0_LoadBalanceResponse grpc_grpclb_response;
-typedef grpc_lb_v0_Server grpc_grpclb_server;
-typedef grpc_lb_v0_Duration grpc_grpclb_duration;
-typedef struct grpc_grpclb_serverlist {
-  grpc_grpclb_server **servers;
-  size_t num_servers;
-  grpc_grpclb_duration expiration_interval;
-} grpc_grpclb_serverlist;
-
-/** Create a request for a gRPC LB service under \a lb_service_name */
-grpc_grpclb_request *grpc_grpclb_request_create(const char *lb_service_name);
-
-/** Protocol Buffers v3-encode \a request */
-gpr_slice grpc_grpclb_request_encode(const grpc_grpclb_request *request);
-
-/** Destroy \a request */
-void grpc_grpclb_request_destroy(grpc_grpclb_request *request);
-
-/** Parse (ie, decode) the bytes in \a encoded_response as a \a
- * grpc_grpclb_response */
-grpc_grpclb_response *grpc_grpclb_response_parse(gpr_slice encoded_response);
-
-/** Destroy \a serverlist */
-void grpc_grpclb_destroy_serverlist(grpc_grpclb_serverlist *serverlist);
-
-/** Parse the list of servers from an encoded \a grpc_grpclb_response */
-grpc_grpclb_serverlist *grpc_grpclb_response_parse_serverlist(
-    gpr_slice encoded_response);
-
-/** Destroy \a response */
-void grpc_grpclb_response_destroy(grpc_grpclb_response *response);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_LOAD_BALANCER_API_H */
diff --git a/src/core/lib/client_config/lb_policies/pick_first.c b/src/core/lib/client_config/lb_policies/pick_first.c
deleted file mode 100644
index 7f11fd05c4..0000000000
--- a/src/core/lib/client_config/lb_policies/pick_first.c
+++ /dev/null
@@ -1,444 +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.
- *
- */
-
-#include "src/core/lib/client_config/lb_policies/pick_first.h"
-
-#include <string.h>
-
-#include <grpc/support/alloc.h>
-#include "src/core/lib/client_config/lb_policy_factory.h"
-#include "src/core/lib/transport/connectivity_state.h"
-
-typedef struct pending_pick {
-  struct pending_pick *next;
-  grpc_pollset *pollset;
-  grpc_connected_subchannel **target;
-  grpc_closure *on_complete;
-} pending_pick;
-
-typedef struct {
-  /** base policy: must be first */
-  grpc_lb_policy base;
-  /** all our subchannels */
-  grpc_subchannel **subchannels;
-  size_t num_subchannels;
-
-  grpc_closure connectivity_changed;
-
-  /** the selected channel (a grpc_connected_subchannel) */
-  gpr_atm selected;
-
-  /** mutex protecting remaining members */
-  gpr_mu mu;
-  /** have we started picking? */
-  int started_picking;
-  /** are we shut down? */
-  int shutdown;
-  /** which subchannel are we watching? */
-  size_t checking_subchannel;
-  /** what is the connectivity of that channel? */
-  grpc_connectivity_state checking_connectivity;
-  /** list of picks that are waiting on connectivity */
-  pending_pick *pending_picks;
-
-  /** our connectivity state tracker */
-  grpc_connectivity_state_tracker state_tracker;
-} pick_first_lb_policy;
-
-#define GET_SELECTED(p) \
-  ((grpc_connected_subchannel *)gpr_atm_acq_load(&(p)->selected))
-
-void pf_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
-  pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
-  grpc_connected_subchannel *selected = GET_SELECTED(p);
-  size_t i;
-  GPR_ASSERT(p->pending_picks == NULL);
-  for (i = 0; i < p->num_subchannels; i++) {
-    GRPC_SUBCHANNEL_UNREF(exec_ctx, p->subchannels[i], "pick_first");
-  }
-  if (selected != NULL) {
-    GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, selected, "picked_first");
-  }
-  grpc_connectivity_state_destroy(exec_ctx, &p->state_tracker);
-  gpr_free(p->subchannels);
-  gpr_mu_destroy(&p->mu);
-  gpr_free(p);
-}
-
-void pf_shutdown(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
-  pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
-  pending_pick *pp;
-  grpc_connected_subchannel *selected;
-  gpr_mu_lock(&p->mu);
-  selected = GET_SELECTED(p);
-  p->shutdown = 1;
-  pp = p->pending_picks;
-  p->pending_picks = NULL;
-  grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                              GRPC_CHANNEL_FATAL_FAILURE, "shutdown");
-  /* cancel subscription */
-  if (selected != NULL) {
-    grpc_connected_subchannel_notify_on_state_change(
-        exec_ctx, selected, NULL, NULL, &p->connectivity_changed);
-  } else {
-    grpc_subchannel_notify_on_state_change(
-        exec_ctx, p->subchannels[p->checking_subchannel], NULL, NULL,
-        &p->connectivity_changed);
-  }
-  gpr_mu_unlock(&p->mu);
-  while (pp != NULL) {
-    pending_pick *next = pp->next;
-    *pp->target = NULL;
-    grpc_pollset_set_del_pollset(exec_ctx, p->base.interested_parties,
-                                 pp->pollset);
-    grpc_exec_ctx_enqueue(exec_ctx, pp->on_complete, true, NULL);
-    gpr_free(pp);
-    pp = next;
-  }
-}
-
-static void pf_cancel_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
-                           grpc_connected_subchannel **target) {
-  pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
-  pending_pick *pp;
-  gpr_mu_lock(&p->mu);
-  pp = p->pending_picks;
-  p->pending_picks = NULL;
-  while (pp != NULL) {
-    pending_pick *next = pp->next;
-    if (pp->target == target) {
-      grpc_pollset_set_del_pollset(exec_ctx, p->base.interested_parties,
-                                   pp->pollset);
-      *target = NULL;
-      grpc_exec_ctx_enqueue(exec_ctx, pp->on_complete, false, NULL);
-      gpr_free(pp);
-    } else {
-      pp->next = p->pending_picks;
-      p->pending_picks = pp;
-    }
-    pp = next;
-  }
-  gpr_mu_unlock(&p->mu);
-}
-
-static void start_picking(grpc_exec_ctx *exec_ctx, pick_first_lb_policy *p) {
-  p->started_picking = 1;
-  p->checking_subchannel = 0;
-  p->checking_connectivity = GRPC_CHANNEL_IDLE;
-  GRPC_LB_POLICY_WEAK_REF(&p->base, "pick_first_connectivity");
-  grpc_subchannel_notify_on_state_change(
-      exec_ctx, p->subchannels[p->checking_subchannel],
-      p->base.interested_parties, &p->checking_connectivity,
-      &p->connectivity_changed);
-}
-
-void pf_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
-  pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
-  gpr_mu_lock(&p->mu);
-  if (!p->started_picking) {
-    start_picking(exec_ctx, p);
-  }
-  gpr_mu_unlock(&p->mu);
-}
-
-int pf_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, grpc_pollset *pollset,
-            grpc_metadata_batch *initial_metadata,
-            grpc_connected_subchannel **target, grpc_closure *on_complete) {
-  pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
-  pending_pick *pp;
-
-  /* Check atomically for a selected channel */
-  grpc_connected_subchannel *selected = GET_SELECTED(p);
-  if (selected != NULL) {
-    *target = selected;
-    return 1;
-  }
-
-  /* No subchannel selected yet, so acquire lock and then attempt again */
-  gpr_mu_lock(&p->mu);
-  selected = GET_SELECTED(p);
-  if (selected) {
-    gpr_mu_unlock(&p->mu);
-    *target = selected;
-    return 1;
-  } else {
-    if (!p->started_picking) {
-      start_picking(exec_ctx, p);
-    }
-    grpc_pollset_set_add_pollset(exec_ctx, p->base.interested_parties, pollset);
-    pp = gpr_malloc(sizeof(*pp));
-    pp->next = p->pending_picks;
-    pp->pollset = pollset;
-    pp->target = target;
-    pp->on_complete = on_complete;
-    p->pending_picks = pp;
-    gpr_mu_unlock(&p->mu);
-    return 0;
-  }
-}
-
-static void destroy_subchannels(grpc_exec_ctx *exec_ctx, void *arg,
-                                bool iomgr_success) {
-  pick_first_lb_policy *p = arg;
-  size_t i;
-  size_t num_subchannels = p->num_subchannels;
-  grpc_subchannel **subchannels;
-
-  gpr_mu_lock(&p->mu);
-  subchannels = p->subchannels;
-  p->num_subchannels = 0;
-  p->subchannels = NULL;
-  gpr_mu_unlock(&p->mu);
-  GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &p->base, "destroy_subchannels");
-
-  for (i = 0; i < num_subchannels; i++) {
-    GRPC_SUBCHANNEL_UNREF(exec_ctx, subchannels[i], "pick_first");
-  }
-
-  gpr_free(subchannels);
-}
-
-static void pf_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg,
-                                    bool iomgr_success) {
-  pick_first_lb_policy *p = arg;
-  grpc_subchannel *selected_subchannel;
-  pending_pick *pp;
-  grpc_connected_subchannel *selected;
-
-  gpr_mu_lock(&p->mu);
-
-  selected = GET_SELECTED(p);
-
-  if (p->shutdown) {
-    gpr_mu_unlock(&p->mu);
-    GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &p->base, "pick_first_connectivity");
-    return;
-  } else if (selected != NULL) {
-    if (p->checking_connectivity == GRPC_CHANNEL_TRANSIENT_FAILURE) {
-      /* if the selected channel goes bad, we're done */
-      p->checking_connectivity = GRPC_CHANNEL_FATAL_FAILURE;
-    }
-    grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                p->checking_connectivity, "selected_changed");
-    if (p->checking_connectivity != GRPC_CHANNEL_FATAL_FAILURE) {
-      grpc_connected_subchannel_notify_on_state_change(
-          exec_ctx, selected, p->base.interested_parties,
-          &p->checking_connectivity, &p->connectivity_changed);
-    } else {
-      GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &p->base, "pick_first_connectivity");
-    }
-  } else {
-  loop:
-    switch (p->checking_connectivity) {
-      case GRPC_CHANNEL_READY:
-        grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                    GRPC_CHANNEL_READY, "connecting_ready");
-        selected_subchannel = p->subchannels[p->checking_subchannel];
-        selected =
-            grpc_subchannel_get_connected_subchannel(selected_subchannel);
-        GPR_ASSERT(selected != NULL);
-        GRPC_CONNECTED_SUBCHANNEL_REF(selected, "picked_first");
-        /* drop the pick list: we are connected now */
-        GRPC_LB_POLICY_WEAK_REF(&p->base, "destroy_subchannels");
-        gpr_atm_rel_store(&p->selected, (gpr_atm)selected);
-        grpc_exec_ctx_enqueue(
-            exec_ctx, grpc_closure_create(destroy_subchannels, p), true, NULL);
-        /* update any calls that were waiting for a pick */
-        while ((pp = p->pending_picks)) {
-          p->pending_picks = pp->next;
-          *pp->target = selected;
-          grpc_pollset_set_del_pollset(exec_ctx, p->base.interested_parties,
-                                       pp->pollset);
-          grpc_exec_ctx_enqueue(exec_ctx, pp->on_complete, true, NULL);
-          gpr_free(pp);
-        }
-        grpc_connected_subchannel_notify_on_state_change(
-            exec_ctx, selected, p->base.interested_parties,
-            &p->checking_connectivity, &p->connectivity_changed);
-        break;
-      case GRPC_CHANNEL_TRANSIENT_FAILURE:
-        grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                    GRPC_CHANNEL_TRANSIENT_FAILURE,
-                                    "connecting_transient_failure");
-        p->checking_subchannel =
-            (p->checking_subchannel + 1) % p->num_subchannels;
-        p->checking_connectivity = grpc_subchannel_check_connectivity(
-            p->subchannels[p->checking_subchannel]);
-        if (p->checking_connectivity == GRPC_CHANNEL_TRANSIENT_FAILURE) {
-          grpc_subchannel_notify_on_state_change(
-              exec_ctx, p->subchannels[p->checking_subchannel],
-              p->base.interested_parties, &p->checking_connectivity,
-              &p->connectivity_changed);
-        } else {
-          goto loop;
-        }
-        break;
-      case GRPC_CHANNEL_CONNECTING:
-      case GRPC_CHANNEL_IDLE:
-        grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                    GRPC_CHANNEL_CONNECTING,
-                                    "connecting_changed");
-        grpc_subchannel_notify_on_state_change(
-            exec_ctx, p->subchannels[p->checking_subchannel],
-            p->base.interested_parties, &p->checking_connectivity,
-            &p->connectivity_changed);
-        break;
-      case GRPC_CHANNEL_FATAL_FAILURE:
-        p->num_subchannels--;
-        GPR_SWAP(grpc_subchannel *, p->subchannels[p->checking_subchannel],
-                 p->subchannels[p->num_subchannels]);
-        GRPC_SUBCHANNEL_UNREF(exec_ctx, p->subchannels[p->num_subchannels],
-                              "pick_first");
-        if (p->num_subchannels == 0) {
-          grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                      GRPC_CHANNEL_FATAL_FAILURE,
-                                      "no_more_channels");
-          while ((pp = p->pending_picks)) {
-            p->pending_picks = pp->next;
-            *pp->target = NULL;
-            grpc_exec_ctx_enqueue(exec_ctx, pp->on_complete, true, NULL);
-            gpr_free(pp);
-          }
-          GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &p->base,
-                                    "pick_first_connectivity");
-        } else {
-          grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                      GRPC_CHANNEL_TRANSIENT_FAILURE,
-                                      "subchannel_failed");
-          p->checking_subchannel %= p->num_subchannels;
-          p->checking_connectivity = grpc_subchannel_check_connectivity(
-              p->subchannels[p->checking_subchannel]);
-          goto loop;
-        }
-    }
-  }
-
-  gpr_mu_unlock(&p->mu);
-}
-
-static grpc_connectivity_state pf_check_connectivity(grpc_exec_ctx *exec_ctx,
-                                                     grpc_lb_policy *pol) {
-  pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
-  grpc_connectivity_state st;
-  gpr_mu_lock(&p->mu);
-  st = grpc_connectivity_state_check(&p->state_tracker);
-  gpr_mu_unlock(&p->mu);
-  return st;
-}
-
-void pf_notify_on_state_change(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
-                               grpc_connectivity_state *current,
-                               grpc_closure *notify) {
-  pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
-  gpr_mu_lock(&p->mu);
-  grpc_connectivity_state_notify_on_state_change(exec_ctx, &p->state_tracker,
-                                                 current, notify);
-  gpr_mu_unlock(&p->mu);
-}
-
-void pf_ping_one(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
-                 grpc_closure *closure) {
-  pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
-  grpc_connected_subchannel *selected = GET_SELECTED(p);
-  if (selected) {
-    grpc_connected_subchannel_ping(exec_ctx, selected, closure);
-  } else {
-    grpc_exec_ctx_enqueue(exec_ctx, closure, false, NULL);
-  }
-}
-
-static const grpc_lb_policy_vtable pick_first_lb_policy_vtable = {
-    pf_destroy,
-    pf_shutdown,
-    pf_pick,
-    pf_cancel_pick,
-    pf_ping_one,
-    pf_exit_idle,
-    pf_check_connectivity,
-    pf_notify_on_state_change};
-
-static void pick_first_factory_ref(grpc_lb_policy_factory *factory) {}
-
-static void pick_first_factory_unref(grpc_lb_policy_factory *factory) {}
-
-static grpc_lb_policy *create_pick_first(grpc_exec_ctx *exec_ctx,
-                                         grpc_lb_policy_factory *factory,
-                                         grpc_lb_policy_args *args) {
-  GPR_ASSERT(args->addresses != NULL);
-  GPR_ASSERT(args->subchannel_factory != NULL);
-
-  if (args->addresses->naddrs == 0) return NULL;
-
-  pick_first_lb_policy *p = gpr_malloc(sizeof(*p));
-  memset(p, 0, sizeof(*p));
-
-  p->subchannels =
-      gpr_malloc(sizeof(grpc_subchannel *) * args->addresses->naddrs);
-  memset(p->subchannels, 0, sizeof(*p->subchannels) * args->addresses->naddrs);
-  grpc_subchannel_args sc_args;
-  size_t subchannel_idx = 0;
-  for (size_t i = 0; i < args->addresses->naddrs; i++) {
-    memset(&sc_args, 0, sizeof(grpc_subchannel_args));
-    sc_args.addr = (struct sockaddr *)(args->addresses->addrs[i].addr);
-    sc_args.addr_len = (size_t)args->addresses->addrs[i].len;
-
-    grpc_subchannel *subchannel = grpc_subchannel_factory_create_subchannel(
-        exec_ctx, args->subchannel_factory, &sc_args);
-
-    if (subchannel != NULL) {
-      p->subchannels[subchannel_idx++] = subchannel;
-    }
-  }
-  if (subchannel_idx == 0) {
-    gpr_free(p->subchannels);
-    gpr_free(p);
-    return NULL;
-  }
-  p->num_subchannels = subchannel_idx;
-
-  grpc_lb_policy_init(&p->base, &pick_first_lb_policy_vtable);
-  grpc_closure_init(&p->connectivity_changed, pf_connectivity_changed, p);
-  gpr_mu_init(&p->mu);
-  return &p->base;
-}
-
-static const grpc_lb_policy_factory_vtable pick_first_factory_vtable = {
-    pick_first_factory_ref, pick_first_factory_unref, create_pick_first,
-    "pick_first"};
-
-static grpc_lb_policy_factory pick_first_lb_policy_factory = {
-    &pick_first_factory_vtable};
-
-grpc_lb_policy_factory *grpc_pick_first_lb_factory_create() {
-  return &pick_first_lb_policy_factory;
-}
diff --git a/src/core/lib/client_config/lb_policies/pick_first.h b/src/core/lib/client_config/lb_policies/pick_first.h
deleted file mode 100644
index d2e66b8b1c..0000000000
--- a/src/core/lib/client_config/lb_policies/pick_first.h
+++ /dev/null
@@ -1,43 +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.
- *
- */
-
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_PICK_FIRST_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_PICK_FIRST_H
-
-#include "src/core/lib/client_config/lb_policy_factory.h"
-
-/** Returns a load balancing factory for the pick first policy, which picks up
- * the first subchannel from \a subchannels to succesfully connect */
-grpc_lb_policy_factory *grpc_pick_first_lb_factory_create();
-
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_PICK_FIRST_H */
diff --git a/src/core/lib/client_config/lb_policies/round_robin.c b/src/core/lib/client_config/lb_policies/round_robin.c
deleted file mode 100644
index fa208ed45b..0000000000
--- a/src/core/lib/client_config/lb_policies/round_robin.c
+++ /dev/null
@@ -1,563 +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.
- *
- */
-
-#include "src/core/lib/client_config/lb_policies/round_robin.h"
-
-#include <string.h>
-
-#include <grpc/support/alloc.h>
-#include "src/core/lib/transport/connectivity_state.h"
-
-typedef struct round_robin_lb_policy round_robin_lb_policy;
-
-int grpc_lb_round_robin_trace = 0;
-
-/** List of entities waiting for a pick.
- *
- * Once a pick is available, \a target is updated and \a on_complete called. */
-typedef struct pending_pick {
-  struct pending_pick *next;
-  grpc_pollset *pollset;
-  grpc_connected_subchannel **target;
-  grpc_closure *on_complete;
-} pending_pick;
-
-/** List of subchannels in a connectivity READY state */
-typedef struct ready_list {
-  grpc_subchannel *subchannel;
-  struct ready_list *next;
-  struct ready_list *prev;
-} ready_list;
-
-typedef struct {
-  /** index within policy->subchannels */
-  size_t index;
-  /** backpointer to owning policy */
-  round_robin_lb_policy *policy;
-  /** subchannel itself */
-  grpc_subchannel *subchannel;
-  /** notification that connectivity has changed on subchannel */
-  grpc_closure connectivity_changed_closure;
-  /** this subchannels current position in subchannel->ready_list */
-  ready_list *ready_list_node;
-  /** last observed connectivity */
-  grpc_connectivity_state connectivity_state;
-} subchannel_data;
-
-struct round_robin_lb_policy {
-  /** base policy: must be first */
-  grpc_lb_policy base;
-
-  /** all our subchannels */
-  size_t num_subchannels;
-  subchannel_data **subchannels;
-
-  /** mutex protecting remaining members */
-  gpr_mu mu;
-  /** have we started picking? */
-  int started_picking;
-  /** are we shutting down? */
-  int shutdown;
-  /** List of picks that are waiting on connectivity */
-  pending_pick *pending_picks;
-
-  /** our connectivity state tracker */
-  grpc_connectivity_state_tracker state_tracker;
-
-  /** (Dummy) root of the doubly linked list containing READY subchannels */
-  ready_list ready_list;
-  /** Last pick from the ready list. */
-  ready_list *ready_list_last_pick;
-};
-
-/** Returns the next subchannel from the connected list or NULL if the list is
- * empty.
- *
- * Note that this function does *not* advance p->ready_list_last_pick. Use \a
- * advance_last_picked_locked() for that. */
-static ready_list *peek_next_connected_locked(const round_robin_lb_policy *p) {
-  ready_list *selected;
-  selected = p->ready_list_last_pick->next;
-
-  while (selected != NULL) {
-    if (selected == &p->ready_list) {
-      GPR_ASSERT(selected->subchannel == NULL);
-      /* skip dummy root */
-      selected = selected->next;
-    } else {
-      GPR_ASSERT(selected->subchannel != NULL);
-      return selected;
-    }
-  }
-  return NULL;
-}
-
-/** Advance the \a ready_list picking head. */
-static void advance_last_picked_locked(round_robin_lb_policy *p) {
-  if (p->ready_list_last_pick->next != NULL) { /* non-empty list */
-    p->ready_list_last_pick = p->ready_list_last_pick->next;
-    if (p->ready_list_last_pick == &p->ready_list) {
-      /* skip dummy root */
-      p->ready_list_last_pick = p->ready_list_last_pick->next;
-    }
-  } else { /* should be an empty list */
-    GPR_ASSERT(p->ready_list_last_pick == &p->ready_list);
-  }
-
-  if (grpc_lb_round_robin_trace) {
-    gpr_log(GPR_DEBUG, "[READYLIST] ADVANCED LAST PICK. NOW AT NODE %p (SC %p)",
-            p->ready_list_last_pick, p->ready_list_last_pick->subchannel);
-  }
-}
-
-/** Prepends (relative to the root at p->ready_list) the connected subchannel \a
- * csc to the list of ready subchannels. */
-static ready_list *add_connected_sc_locked(round_robin_lb_policy *p,
-                                           grpc_subchannel *sc) {
-  ready_list *new_elem = gpr_malloc(sizeof(ready_list));
-  new_elem->subchannel = sc;
-  if (p->ready_list.prev == NULL) {
-    /* first element */
-    new_elem->next = &p->ready_list;
-    new_elem->prev = &p->ready_list;
-    p->ready_list.next = new_elem;
-    p->ready_list.prev = new_elem;
-  } else {
-    new_elem->next = &p->ready_list;
-    new_elem->prev = p->ready_list.prev;
-    p->ready_list.prev->next = new_elem;
-    p->ready_list.prev = new_elem;
-  }
-  if (grpc_lb_round_robin_trace) {
-    gpr_log(GPR_DEBUG, "[READYLIST] ADDING NODE %p (SC %p)", new_elem, sc);
-  }
-  return new_elem;
-}
-
-/** Removes \a node from the list of connected subchannels */
-static void remove_disconnected_sc_locked(round_robin_lb_policy *p,
-                                          ready_list *node) {
-  if (node == NULL) {
-    return;
-  }
-  if (node == p->ready_list_last_pick) {
-    /* If removing the lastly picked node, reset the last pick pointer to the
-     * dummy root of the list */
-    p->ready_list_last_pick = &p->ready_list;
-  }
-
-  /* removing last item */
-  if (node->next == &p->ready_list && node->prev == &p->ready_list) {
-    GPR_ASSERT(p->ready_list.next == node);
-    GPR_ASSERT(p->ready_list.prev == node);
-    p->ready_list.next = NULL;
-    p->ready_list.prev = NULL;
-  } else {
-    node->prev->next = node->next;
-    node->next->prev = node->prev;
-  }
-
-  if (grpc_lb_round_robin_trace) {
-    gpr_log(GPR_DEBUG, "[READYLIST] REMOVED NODE %p (SC %p)", node,
-            node->subchannel);
-  }
-
-  node->next = NULL;
-  node->prev = NULL;
-  node->subchannel = NULL;
-
-  gpr_free(node);
-}
-
-void rr_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
-  round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
-  size_t i;
-  ready_list *elem;
-  for (i = 0; i < p->num_subchannels; i++) {
-    subchannel_data *sd = p->subchannels[i];
-    GRPC_SUBCHANNEL_UNREF(exec_ctx, sd->subchannel, "round_robin");
-    gpr_free(sd);
-  }
-
-  grpc_connectivity_state_destroy(exec_ctx, &p->state_tracker);
-  gpr_free(p->subchannels);
-  gpr_mu_destroy(&p->mu);
-
-  elem = p->ready_list.next;
-  while (elem != NULL && elem != &p->ready_list) {
-    ready_list *tmp;
-    tmp = elem->next;
-    elem->next = NULL;
-    elem->prev = NULL;
-    elem->subchannel = NULL;
-    gpr_free(elem);
-    elem = tmp;
-  }
-  gpr_free(p);
-}
-
-void rr_shutdown(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
-  round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
-  pending_pick *pp;
-  size_t i;
-
-  gpr_mu_lock(&p->mu);
-
-  p->shutdown = 1;
-  while ((pp = p->pending_picks)) {
-    p->pending_picks = pp->next;
-    *pp->target = NULL;
-    grpc_exec_ctx_enqueue(exec_ctx, pp->on_complete, false, NULL);
-    gpr_free(pp);
-  }
-  grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                              GRPC_CHANNEL_FATAL_FAILURE, "shutdown");
-  for (i = 0; i < p->num_subchannels; i++) {
-    subchannel_data *sd = p->subchannels[i];
-    grpc_subchannel_notify_on_state_change(exec_ctx, sd->subchannel, NULL, NULL,
-                                           &sd->connectivity_changed_closure);
-  }
-  gpr_mu_unlock(&p->mu);
-}
-
-static void rr_cancel_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
-                           grpc_connected_subchannel **target) {
-  round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
-  pending_pick *pp;
-  gpr_mu_lock(&p->mu);
-  pp = p->pending_picks;
-  p->pending_picks = NULL;
-  while (pp != NULL) {
-    pending_pick *next = pp->next;
-    if (pp->target == target) {
-      grpc_pollset_set_del_pollset(exec_ctx, p->base.interested_parties,
-                                   pp->pollset);
-      *target = NULL;
-      grpc_exec_ctx_enqueue(exec_ctx, pp->on_complete, false, NULL);
-      gpr_free(pp);
-    } else {
-      pp->next = p->pending_picks;
-      p->pending_picks = pp;
-    }
-    pp = next;
-  }
-  gpr_mu_unlock(&p->mu);
-}
-
-static void start_picking(grpc_exec_ctx *exec_ctx, round_robin_lb_policy *p) {
-  size_t i;
-  p->started_picking = 1;
-
-  gpr_log(GPR_DEBUG, "LB_POLICY: p=%p num_subchannels=%d", p,
-          p->num_subchannels);
-
-  for (i = 0; i < p->num_subchannels; i++) {
-    subchannel_data *sd = p->subchannels[i];
-    sd->connectivity_state = GRPC_CHANNEL_IDLE;
-    grpc_subchannel_notify_on_state_change(
-        exec_ctx, sd->subchannel, p->base.interested_parties,
-        &sd->connectivity_state, &sd->connectivity_changed_closure);
-    GRPC_LB_POLICY_WEAK_REF(&p->base, "round_robin_connectivity");
-  }
-}
-
-void rr_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
-  round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
-  gpr_mu_lock(&p->mu);
-  if (!p->started_picking) {
-    start_picking(exec_ctx, p);
-  }
-  gpr_mu_unlock(&p->mu);
-}
-
-int rr_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, grpc_pollset *pollset,
-            grpc_metadata_batch *initial_metadata,
-            grpc_connected_subchannel **target, grpc_closure *on_complete) {
-  round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
-  pending_pick *pp;
-  ready_list *selected;
-  gpr_mu_lock(&p->mu);
-  if ((selected = peek_next_connected_locked(p))) {
-    gpr_mu_unlock(&p->mu);
-    *target = grpc_subchannel_get_connected_subchannel(selected->subchannel);
-    if (grpc_lb_round_robin_trace) {
-      gpr_log(GPR_DEBUG,
-              "[RR PICK] TARGET <-- CONNECTED SUBCHANNEL %p (NODE %p)",
-              selected->subchannel, selected);
-    }
-    /* only advance the last picked pointer if the selection was used */
-    advance_last_picked_locked(p);
-    return 1;
-  } else {
-    if (!p->started_picking) {
-      start_picking(exec_ctx, p);
-    }
-    grpc_pollset_set_add_pollset(exec_ctx, p->base.interested_parties, pollset);
-    pp = gpr_malloc(sizeof(*pp));
-    pp->next = p->pending_picks;
-    pp->pollset = pollset;
-    pp->target = target;
-    pp->on_complete = on_complete;
-    p->pending_picks = pp;
-    gpr_mu_unlock(&p->mu);
-    return 0;
-  }
-}
-
-static void rr_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg,
-                                    bool iomgr_success) {
-  subchannel_data *sd = arg;
-  round_robin_lb_policy *p = sd->policy;
-  pending_pick *pp;
-  ready_list *selected;
-
-  int unref = 0;
-
-  gpr_mu_lock(&p->mu);
-
-  if (p->shutdown) {
-    unref = 1;
-  } else {
-    switch (sd->connectivity_state) {
-      case GRPC_CHANNEL_READY:
-        grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                    GRPC_CHANNEL_READY, "connecting_ready");
-        /* add the newly connected subchannel to the list of connected ones.
-         * Note that it goes to the "end of the line". */
-        sd->ready_list_node = add_connected_sc_locked(p, sd->subchannel);
-        /* at this point we know there's at least one suitable subchannel. Go
-         * ahead and pick one and notify the pending suitors in
-         * p->pending_picks. This preemtively replicates rr_pick()'s actions. */
-        selected = peek_next_connected_locked(p);
-        if (p->pending_picks != NULL) {
-          /* if the selected subchannel is going to be used for the pending
-           * picks, update the last picked pointer */
-          advance_last_picked_locked(p);
-        }
-        while ((pp = p->pending_picks)) {
-          p->pending_picks = pp->next;
-          *pp->target =
-              grpc_subchannel_get_connected_subchannel(selected->subchannel);
-          if (grpc_lb_round_robin_trace) {
-            gpr_log(GPR_DEBUG,
-                    "[RR CONN CHANGED] TARGET <-- SUBCHANNEL %p (NODE %p)",
-                    selected->subchannel, selected);
-          }
-          grpc_pollset_set_del_pollset(exec_ctx, p->base.interested_parties,
-                                       pp->pollset);
-          grpc_exec_ctx_enqueue(exec_ctx, pp->on_complete, true, NULL);
-          gpr_free(pp);
-        }
-        grpc_subchannel_notify_on_state_change(
-            exec_ctx, sd->subchannel, p->base.interested_parties,
-            &sd->connectivity_state, &sd->connectivity_changed_closure);
-        break;
-      case GRPC_CHANNEL_CONNECTING:
-      case GRPC_CHANNEL_IDLE:
-        grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                    sd->connectivity_state,
-                                    "connecting_changed");
-        grpc_subchannel_notify_on_state_change(
-            exec_ctx, sd->subchannel, p->base.interested_parties,
-            &sd->connectivity_state, &sd->connectivity_changed_closure);
-        break;
-      case GRPC_CHANNEL_TRANSIENT_FAILURE:
-        /* renew state notification */
-        grpc_subchannel_notify_on_state_change(
-            exec_ctx, sd->subchannel, p->base.interested_parties,
-            &sd->connectivity_state, &sd->connectivity_changed_closure);
-
-        /* remove from ready list if still present */
-        if (sd->ready_list_node != NULL) {
-          remove_disconnected_sc_locked(p, sd->ready_list_node);
-          sd->ready_list_node = NULL;
-        }
-        grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                    GRPC_CHANNEL_TRANSIENT_FAILURE,
-                                    "connecting_transient_failure");
-        break;
-      case GRPC_CHANNEL_FATAL_FAILURE:
-        if (sd->ready_list_node != NULL) {
-          remove_disconnected_sc_locked(p, sd->ready_list_node);
-          sd->ready_list_node = NULL;
-        }
-
-        p->num_subchannels--;
-        GPR_SWAP(subchannel_data *, p->subchannels[sd->index],
-                 p->subchannels[p->num_subchannels]);
-        GRPC_SUBCHANNEL_UNREF(exec_ctx, sd->subchannel, "round_robin");
-        p->subchannels[sd->index]->index = sd->index;
-        gpr_free(sd);
-
-        unref = 1;
-        if (p->num_subchannels == 0) {
-          grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                      GRPC_CHANNEL_FATAL_FAILURE,
-                                      "no_more_channels");
-          while ((pp = p->pending_picks)) {
-            p->pending_picks = pp->next;
-            *pp->target = NULL;
-            grpc_exec_ctx_enqueue(exec_ctx, pp->on_complete, true, NULL);
-            gpr_free(pp);
-          }
-        } else {
-          grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                      GRPC_CHANNEL_TRANSIENT_FAILURE,
-                                      "subchannel_failed");
-        }
-    } /* switch */
-  }   /* !unref */
-
-  gpr_mu_unlock(&p->mu);
-
-  if (unref) {
-    GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &p->base, "round_robin_connectivity");
-  }
-}
-
-static grpc_connectivity_state rr_check_connectivity(grpc_exec_ctx *exec_ctx,
-                                                     grpc_lb_policy *pol) {
-  round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
-  grpc_connectivity_state st;
-  gpr_mu_lock(&p->mu);
-  st = grpc_connectivity_state_check(&p->state_tracker);
-  gpr_mu_unlock(&p->mu);
-  return st;
-}
-
-static void rr_notify_on_state_change(grpc_exec_ctx *exec_ctx,
-                                      grpc_lb_policy *pol,
-                                      grpc_connectivity_state *current,
-                                      grpc_closure *notify) {
-  round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
-  gpr_mu_lock(&p->mu);
-  grpc_connectivity_state_notify_on_state_change(exec_ctx, &p->state_tracker,
-                                                 current, notify);
-  gpr_mu_unlock(&p->mu);
-}
-
-static void rr_ping_one(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
-                        grpc_closure *closure) {
-  round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
-  ready_list *selected;
-  grpc_connected_subchannel *target;
-  gpr_mu_lock(&p->mu);
-  if ((selected = peek_next_connected_locked(p))) {
-    gpr_mu_unlock(&p->mu);
-    target = grpc_subchannel_get_connected_subchannel(selected->subchannel);
-    grpc_connected_subchannel_ping(exec_ctx, target, closure);
-  } else {
-    gpr_mu_unlock(&p->mu);
-    grpc_exec_ctx_enqueue(exec_ctx, closure, false, NULL);
-  }
-}
-
-static const grpc_lb_policy_vtable round_robin_lb_policy_vtable = {
-    rr_destroy,
-    rr_shutdown,
-    rr_pick,
-    rr_cancel_pick,
-    rr_ping_one,
-    rr_exit_idle,
-    rr_check_connectivity,
-    rr_notify_on_state_change};
-
-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_exec_ctx *exec_ctx,
-                                          grpc_lb_policy_factory *factory,
-                                          grpc_lb_policy_args *args) {
-  GPR_ASSERT(args->addresses != NULL);
-  GPR_ASSERT(args->subchannel_factory != NULL);
-
-  round_robin_lb_policy *p = gpr_malloc(sizeof(*p));
-  memset(p, 0, sizeof(*p));
-
-  p->subchannels =
-      gpr_malloc(sizeof(*p->subchannels) * args->addresses->naddrs);
-  memset(p->subchannels, 0, sizeof(*p->subchannels) * args->addresses->naddrs);
-
-  grpc_subchannel_args sc_args;
-  size_t subchannel_idx = 0;
-  for (size_t i = 0; i < args->addresses->naddrs; i++) {
-    memset(&sc_args, 0, sizeof(grpc_subchannel_args));
-    sc_args.addr = (struct sockaddr *)(args->addresses->addrs[i].addr);
-    sc_args.addr_len = (size_t)args->addresses->addrs[i].len;
-
-    grpc_subchannel *subchannel = grpc_subchannel_factory_create_subchannel(
-        exec_ctx, args->subchannel_factory, &sc_args);
-
-    if (subchannel != NULL) {
-      subchannel_data *sd = gpr_malloc(sizeof(*sd));
-      memset(sd, 0, sizeof(*sd));
-      p->subchannels[subchannel_idx] = sd;
-      sd->policy = p;
-      sd->index = subchannel_idx;
-      sd->subchannel = subchannel;
-      ++subchannel_idx;
-      grpc_closure_init(&sd->connectivity_changed_closure,
-                        rr_connectivity_changed, sd);
-    }
-  }
-  if (subchannel_idx == 0) {
-    gpr_free(p->subchannels);
-    gpr_free(p);
-    return NULL;
-  }
-  p->num_subchannels = subchannel_idx;
-
-  /* The (dummy node) root of the ready list */
-  p->ready_list.subchannel = NULL;
-  p->ready_list.prev = NULL;
-  p->ready_list.next = NULL;
-  p->ready_list_last_pick = &p->ready_list;
-
-  grpc_lb_policy_init(&p->base, &round_robin_lb_policy_vtable);
-  grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
-                               "round_robin");
-  gpr_mu_init(&p->mu);
-  return &p->base;
-}
-
-static const grpc_lb_policy_factory_vtable round_robin_factory_vtable = {
-    round_robin_factory_ref, round_robin_factory_unref, create_round_robin,
-    "round_robin"};
-
-static grpc_lb_policy_factory round_robin_lb_policy_factory = {
-    &round_robin_factory_vtable};
-
-grpc_lb_policy_factory *grpc_round_robin_lb_factory_create() {
-  return &round_robin_lb_policy_factory;
-}
diff --git a/src/core/lib/client_config/lb_policies/round_robin.h b/src/core/lib/client_config/lb_policies/round_robin.h
deleted file mode 100644
index c5386c75ec..0000000000
--- a/src/core/lib/client_config/lb_policies/round_robin.h
+++ /dev/null
@@ -1,46 +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.
- *
- */
-
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_ROUND_ROBIN_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_ROUND_ROBIN_H
-
-#include "src/core/lib/client_config/lb_policy.h"
-
-extern int grpc_lb_round_robin_trace;
-
-#include "src/core/lib/client_config/lb_policy_factory.h"
-
-/** Returns a load balancing factory for the round robin policy */
-grpc_lb_policy_factory *grpc_round_robin_lb_factory_create();
-
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_ROUND_ROBIN_H */
diff --git a/src/core/lib/client_config/lb_policy_registry.c b/src/core/lib/client_config/lb_policy_registry.c
index 9b623bc773..af396362a1 100644
--- a/src/core/lib/client_config/lb_policy_registry.c
+++ b/src/core/lib/client_config/lb_policy_registry.c
@@ -40,12 +40,7 @@
 static grpc_lb_policy_factory *g_all_of_the_lb_policies[MAX_POLICIES];
 static int g_number_of_lb_policies = 0;
 
-static grpc_lb_policy_factory *g_default_lb_policy_factory;
-
-void grpc_lb_policy_registry_init(grpc_lb_policy_factory *default_factory) {
-  g_number_of_lb_policies = 0;
-  g_default_lb_policy_factory = default_factory;
-}
+void grpc_lb_policy_registry_init(void) { g_number_of_lb_policies = 0; }
 
 void grpc_lb_policy_registry_shutdown(void) {
   int i;
diff --git a/src/core/lib/client_config/lb_policy_registry.h b/src/core/lib/client_config/lb_policy_registry.h
index 917d6b2731..4b8495d8a1 100644
--- a/src/core/lib/client_config/lb_policy_registry.h
+++ b/src/core/lib/client_config/lb_policy_registry.h
@@ -39,7 +39,7 @@
 
 /** Initialize the registry and set \a default_factory as the factory to be
  * returned when no name is provided in a lookup */
-void grpc_lb_policy_registry_init(grpc_lb_policy_factory *default_factory);
+void grpc_lb_policy_registry_init(void);
 void grpc_lb_policy_registry_shutdown(void);
 
 /** Register a LB policy factory. */
diff --git a/src/core/lib/iomgr/unix_sockets_posix_noop.c b/src/core/lib/iomgr/unix_sockets_posix_noop.c
index 06f6ee05e7..43e006e15e 100644
--- a/src/core/lib/iomgr/unix_sockets_posix_noop.c
+++ b/src/core/lib/iomgr/unix_sockets_posix_noop.c
@@ -35,7 +35,12 @@
 
 #ifndef GPR_HAVE_UNIX_SOCKET
 
-void grpc_create_socketpair_if_unix(int sv[2]) {}
+void grpc_create_socketpair_if_unix(int sv[2]) {
+  // TODO: Either implement this for the non-Unix socket case or make
+  // sure that it is never called in any such case. Until then, leave an
+  // assertion to notify if this gets called inadvertently
+  GPR_ASSERT(0);
+}
 
 grpc_resolved_addresses *grpc_resolve_unix_domain_address(const char *name) {
   return NULL;
diff --git a/src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c b/src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c
deleted file mode 100644
index 8f82141f96..0000000000
--- a/src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c
+++ /dev/null
@@ -1,119 +0,0 @@
-/*
- *
- * Copyright 2016, 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.
- *
- */
-/* Automatically generated nanopb constant definitions */
-/* Generated by nanopb-0.3.5-dev */
-
-#include "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h"
-
-#if PB_PROTO_HEADER_VERSION != 30
-#error Regenerate this file with the current version of nanopb generator.
-#endif
-
-
-
-const pb_field_t grpc_lb_v0_Duration_fields[3] = {
-    PB_FIELD(  1, INT64   , OPTIONAL, STATIC  , FIRST, grpc_lb_v0_Duration, seconds, seconds, 0),
-    PB_FIELD(  2, INT32   , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_Duration, nanos, seconds, 0),
-    PB_LAST_FIELD
-};
-
-const pb_field_t grpc_lb_v0_LoadBalanceRequest_fields[3] = {
-    PB_FIELD(  1, MESSAGE , OPTIONAL, STATIC  , FIRST, grpc_lb_v0_LoadBalanceRequest, initial_request, initial_request, &grpc_lb_v0_InitialLoadBalanceRequest_fields),
-    PB_FIELD(  2, MESSAGE , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_LoadBalanceRequest, client_stats, initial_request, &grpc_lb_v0_ClientStats_fields),
-    PB_LAST_FIELD
-};
-
-const pb_field_t grpc_lb_v0_InitialLoadBalanceRequest_fields[2] = {
-    PB_FIELD(  1, STRING  , OPTIONAL, STATIC  , FIRST, grpc_lb_v0_InitialLoadBalanceRequest, name, name, 0),
-    PB_LAST_FIELD
-};
-
-const pb_field_t grpc_lb_v0_ClientStats_fields[4] = {
-    PB_FIELD(  1, INT64   , OPTIONAL, STATIC  , FIRST, grpc_lb_v0_ClientStats, total_requests, total_requests, 0),
-    PB_FIELD(  2, INT64   , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_ClientStats, client_rpc_errors, total_requests, 0),
-    PB_FIELD(  3, INT64   , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_ClientStats, dropped_requests, client_rpc_errors, 0),
-    PB_LAST_FIELD
-};
-
-const pb_field_t grpc_lb_v0_LoadBalanceResponse_fields[3] = {
-    PB_FIELD(  1, MESSAGE , OPTIONAL, STATIC  , FIRST, grpc_lb_v0_LoadBalanceResponse, initial_response, initial_response, &grpc_lb_v0_InitialLoadBalanceResponse_fields),
-    PB_FIELD(  2, MESSAGE , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_LoadBalanceResponse, server_list, initial_response, &grpc_lb_v0_ServerList_fields),
-    PB_LAST_FIELD
-};
-
-const pb_field_t grpc_lb_v0_InitialLoadBalanceResponse_fields[4] = {
-    PB_FIELD(  1, STRING  , OPTIONAL, STATIC  , FIRST, grpc_lb_v0_InitialLoadBalanceResponse, client_config, client_config, 0),
-    PB_FIELD(  2, STRING  , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_InitialLoadBalanceResponse, load_balancer_delegate, client_config, 0),
-    PB_FIELD(  3, MESSAGE , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_InitialLoadBalanceResponse, client_stats_report_interval, load_balancer_delegate, &grpc_lb_v0_Duration_fields),
-    PB_LAST_FIELD
-};
-
-const pb_field_t grpc_lb_v0_ServerList_fields[3] = {
-    PB_FIELD(  1, MESSAGE , REPEATED, CALLBACK, FIRST, grpc_lb_v0_ServerList, servers, servers, &grpc_lb_v0_Server_fields),
-    PB_FIELD(  3, MESSAGE , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_ServerList, expiration_interval, servers, &grpc_lb_v0_Duration_fields),
-    PB_LAST_FIELD
-};
-
-const pb_field_t grpc_lb_v0_Server_fields[5] = {
-    PB_FIELD(  1, STRING  , OPTIONAL, STATIC  , FIRST, grpc_lb_v0_Server, ip_address, ip_address, 0),
-    PB_FIELD(  2, INT32   , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_Server, port, ip_address, 0),
-    PB_FIELD(  3, BYTES   , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_Server, load_balance_token, port, 0),
-    PB_FIELD(  4, BOOL    , OPTIONAL, STATIC  , OTHER, grpc_lb_v0_Server, drop_request, load_balance_token, 0),
-    PB_LAST_FIELD
-};
-
-
-/* Check that field information fits in pb_field_t */
-#if !defined(PB_FIELD_32BIT)
-/* If you get an error here, it means that you need to define PB_FIELD_32BIT
- * compile-time option. You can do that in pb.h or on compiler command line.
- * 
- * The reason you need to do this is that some of your messages contain tag
- * numbers or field sizes that are larger than what can fit in 8 or 16 bit
- * field descriptors.
- */
-PB_STATIC_ASSERT((pb_membersize(grpc_lb_v0_LoadBalanceRequest, initial_request) < 65536 && pb_membersize(grpc_lb_v0_LoadBalanceRequest, client_stats) < 65536 && pb_membersize(grpc_lb_v0_LoadBalanceResponse, initial_response) < 65536 && pb_membersize(grpc_lb_v0_LoadBalanceResponse, server_list) < 65536 && pb_membersize(grpc_lb_v0_InitialLoadBalanceResponse, client_stats_report_interval) < 65536 && pb_membersize(grpc_lb_v0_ServerList, servers) < 65536 && pb_membersize(grpc_lb_v0_ServerList, expiration_interval) < 65536), YOU_MUST_DEFINE_PB_FIELD_32BIT_FOR_MESSAGES_grpc_lb_v0_Duration_grpc_lb_v0_LoadBalanceRequest_grpc_lb_v0_InitialLoadBalanceRequest_grpc_lb_v0_ClientStats_grpc_lb_v0_LoadBalanceResponse_grpc_lb_v0_InitialLoadBalanceResponse_grpc_lb_v0_ServerList_grpc_lb_v0_Server)
-#endif
-
-#if !defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT)
-/* If you get an error here, it means that you need to define PB_FIELD_16BIT
- * compile-time option. You can do that in pb.h or on compiler command line.
- * 
- * The reason you need to do this is that some of your messages contain tag
- * numbers or field sizes that are larger than what can fit in the default
- * 8 bit descriptors.
- */
-PB_STATIC_ASSERT((pb_membersize(grpc_lb_v0_LoadBalanceRequest, initial_request) < 256 && pb_membersize(grpc_lb_v0_LoadBalanceRequest, client_stats) < 256 && pb_membersize(grpc_lb_v0_LoadBalanceResponse, initial_response) < 256 && pb_membersize(grpc_lb_v0_LoadBalanceResponse, server_list) < 256 && pb_membersize(grpc_lb_v0_InitialLoadBalanceResponse, client_stats_report_interval) < 256 && pb_membersize(grpc_lb_v0_ServerList, servers) < 256 && pb_membersize(grpc_lb_v0_ServerList, expiration_interval) < 256), YOU_MUST_DEFINE_PB_FIELD_16BIT_FOR_MESSAGES_grpc_lb_v0_Duration_grpc_lb_v0_LoadBalanceRequest_grpc_lb_v0_InitialLoadBalanceRequest_grpc_lb_v0_ClientStats_grpc_lb_v0_LoadBalanceResponse_grpc_lb_v0_InitialLoadBalanceResponse_grpc_lb_v0_ServerList_grpc_lb_v0_Server)
-#endif
-
-
diff --git a/src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h b/src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h
deleted file mode 100644
index 3599f881bb..0000000000
--- a/src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h
+++ /dev/null
@@ -1,182 +0,0 @@
-/*
- *
- * Copyright 2016, 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.
- *
- */
-/* Automatically generated nanopb header */
-/* Generated by nanopb-0.3.5-dev */
-
-#ifndef PB_LOAD_BALANCER_PB_H_INCLUDED
-#define PB_LOAD_BALANCER_PB_H_INCLUDED
-#include "third_party/nanopb/pb.h"
-#if PB_PROTO_HEADER_VERSION != 30
-#error Regenerate this file with the current version of nanopb generator.
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Struct definitions */
-typedef struct _grpc_lb_v0_ClientStats {
-    bool has_total_requests;
-    int64_t total_requests;
-    bool has_client_rpc_errors;
-    int64_t client_rpc_errors;
-    bool has_dropped_requests;
-    int64_t dropped_requests;
-} grpc_lb_v0_ClientStats;
-
-typedef struct _grpc_lb_v0_Duration {
-    bool has_seconds;
-    int64_t seconds;
-    bool has_nanos;
-    int32_t nanos;
-} grpc_lb_v0_Duration;
-
-typedef struct _grpc_lb_v0_InitialLoadBalanceRequest {
-    bool has_name;
-    char name[128];
-} grpc_lb_v0_InitialLoadBalanceRequest;
-
-typedef PB_BYTES_ARRAY_T(64) grpc_lb_v0_Server_load_balance_token_t;
-typedef struct _grpc_lb_v0_Server {
-    bool has_ip_address;
-    char ip_address[46];
-    bool has_port;
-    int32_t port;
-    bool has_load_balance_token;
-    grpc_lb_v0_Server_load_balance_token_t load_balance_token;
-    bool has_drop_request;
-    bool drop_request;
-} grpc_lb_v0_Server;
-
-typedef struct _grpc_lb_v0_InitialLoadBalanceResponse {
-    bool has_client_config;
-    char client_config[64];
-    bool has_load_balancer_delegate;
-    char load_balancer_delegate[64];
-    bool has_client_stats_report_interval;
-    grpc_lb_v0_Duration client_stats_report_interval;
-} grpc_lb_v0_InitialLoadBalanceResponse;
-
-typedef struct _grpc_lb_v0_LoadBalanceRequest {
-    bool has_initial_request;
-    grpc_lb_v0_InitialLoadBalanceRequest initial_request;
-    bool has_client_stats;
-    grpc_lb_v0_ClientStats client_stats;
-} grpc_lb_v0_LoadBalanceRequest;
-
-typedef struct _grpc_lb_v0_ServerList {
-    pb_callback_t servers;
-    bool has_expiration_interval;
-    grpc_lb_v0_Duration expiration_interval;
-} grpc_lb_v0_ServerList;
-
-typedef struct _grpc_lb_v0_LoadBalanceResponse {
-    bool has_initial_response;
-    grpc_lb_v0_InitialLoadBalanceResponse initial_response;
-    bool has_server_list;
-    grpc_lb_v0_ServerList server_list;
-} grpc_lb_v0_LoadBalanceResponse;
-
-/* Default values for struct fields */
-
-/* Initializer values for message structs */
-#define grpc_lb_v0_Duration_init_default         {false, 0, false, 0}
-#define grpc_lb_v0_LoadBalanceRequest_init_default {false, grpc_lb_v0_InitialLoadBalanceRequest_init_default, false, grpc_lb_v0_ClientStats_init_default}
-#define grpc_lb_v0_InitialLoadBalanceRequest_init_default {false, ""}
-#define grpc_lb_v0_ClientStats_init_default      {false, 0, false, 0, false, 0}
-#define grpc_lb_v0_LoadBalanceResponse_init_default {false, grpc_lb_v0_InitialLoadBalanceResponse_init_default, false, grpc_lb_v0_ServerList_init_default}
-#define grpc_lb_v0_InitialLoadBalanceResponse_init_default {false, "", false, "", false, grpc_lb_v0_Duration_init_default}
-#define grpc_lb_v0_ServerList_init_default       {{{NULL}, NULL}, false, grpc_lb_v0_Duration_init_default}
-#define grpc_lb_v0_Server_init_default           {false, "", false, 0, false, {0, {0}}, false, 0}
-#define grpc_lb_v0_Duration_init_zero            {false, 0, false, 0}
-#define grpc_lb_v0_LoadBalanceRequest_init_zero  {false, grpc_lb_v0_InitialLoadBalanceRequest_init_zero, false, grpc_lb_v0_ClientStats_init_zero}
-#define grpc_lb_v0_InitialLoadBalanceRequest_init_zero {false, ""}
-#define grpc_lb_v0_ClientStats_init_zero         {false, 0, false, 0, false, 0}
-#define grpc_lb_v0_LoadBalanceResponse_init_zero {false, grpc_lb_v0_InitialLoadBalanceResponse_init_zero, false, grpc_lb_v0_ServerList_init_zero}
-#define grpc_lb_v0_InitialLoadBalanceResponse_init_zero {false, "", false, "", false, grpc_lb_v0_Duration_init_zero}
-#define grpc_lb_v0_ServerList_init_zero          {{{NULL}, NULL}, false, grpc_lb_v0_Duration_init_zero}
-#define grpc_lb_v0_Server_init_zero              {false, "", false, 0, false, {0, {0}}, false, 0}
-
-/* Field tags (for use in manual encoding/decoding) */
-#define grpc_lb_v0_ClientStats_total_requests_tag 1
-#define grpc_lb_v0_ClientStats_client_rpc_errors_tag 2
-#define grpc_lb_v0_ClientStats_dropped_requests_tag 3
-#define grpc_lb_v0_Duration_seconds_tag          1
-#define grpc_lb_v0_Duration_nanos_tag            2
-#define grpc_lb_v0_InitialLoadBalanceRequest_name_tag 1
-#define grpc_lb_v0_Server_ip_address_tag         1
-#define grpc_lb_v0_Server_port_tag               2
-#define grpc_lb_v0_Server_load_balance_token_tag 3
-#define grpc_lb_v0_Server_drop_request_tag       4
-#define grpc_lb_v0_InitialLoadBalanceResponse_client_config_tag 1
-#define grpc_lb_v0_InitialLoadBalanceResponse_load_balancer_delegate_tag 2
-#define grpc_lb_v0_InitialLoadBalanceResponse_client_stats_report_interval_tag 3
-#define grpc_lb_v0_LoadBalanceRequest_initial_request_tag 1
-#define grpc_lb_v0_LoadBalanceRequest_client_stats_tag 2
-#define grpc_lb_v0_ServerList_servers_tag        1
-#define grpc_lb_v0_ServerList_expiration_interval_tag 3
-#define grpc_lb_v0_LoadBalanceResponse_initial_response_tag 1
-#define grpc_lb_v0_LoadBalanceResponse_server_list_tag 2
-
-/* Struct field encoding specification for nanopb */
-extern const pb_field_t grpc_lb_v0_Duration_fields[3];
-extern const pb_field_t grpc_lb_v0_LoadBalanceRequest_fields[3];
-extern const pb_field_t grpc_lb_v0_InitialLoadBalanceRequest_fields[2];
-extern const pb_field_t grpc_lb_v0_ClientStats_fields[4];
-extern const pb_field_t grpc_lb_v0_LoadBalanceResponse_fields[3];
-extern const pb_field_t grpc_lb_v0_InitialLoadBalanceResponse_fields[4];
-extern const pb_field_t grpc_lb_v0_ServerList_fields[3];
-extern const pb_field_t grpc_lb_v0_Server_fields[5];
-
-/* Maximum encoded size of messages (where known) */
-#define grpc_lb_v0_Duration_size                 22
-#define grpc_lb_v0_LoadBalanceRequest_size       169
-#define grpc_lb_v0_InitialLoadBalanceRequest_size 131
-#define grpc_lb_v0_ClientStats_size              33
-#define grpc_lb_v0_LoadBalanceResponse_size      (165 + grpc_lb_v0_ServerList_size)
-#define grpc_lb_v0_InitialLoadBalanceResponse_size 156
-#define grpc_lb_v0_Server_size                   127
-
-/* Message IDs (where set with "msgid" option) */
-#ifdef PB_MSGID
-
-#define LOAD_BALANCER_MESSAGES \
-
-
-#endif
-
-#ifdef __cplusplus
-} /* extern "C" */
-#endif
-
-#endif
diff --git a/src/core/lib/surface/init.c b/src/core/lib/surface/init.c
index 86e4dcba5e..566b030912 100644
--- a/src/core/lib/surface/init.c
+++ b/src/core/lib/surface/init.c
@@ -48,8 +48,6 @@
 #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_policies/pick_first.h"
-#include "src/core/lib/client_config/lb_policies/round_robin.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/resolvers/dns_resolver.h"
@@ -75,6 +73,9 @@
 #define GRPC_DEFAULT_NAME_PREFIX "dns:///"
 #endif
 
+/* (generated) built in registry of plugins */
+extern void grpc_register_built_in_plugins(void);
+
 #define MAX_PLUGINS 128
 
 static gpr_once g_basic_init = GPR_ONCE_INIT;
@@ -83,6 +84,7 @@ static int g_initializations;
 
 static void do_basic_init(void) {
   gpr_mu_init(&g_init_mu);
+  grpc_register_built_in_plugins();
   /* TODO(ctiller): ideally remove this strict linkage */
   grpc_register_plugin(census_grpc_plugin_init, census_grpc_plugin_destroy);
   g_initializations = 0;
@@ -165,14 +167,12 @@ void grpc_init(void) {
     gpr_time_init();
     grpc_mdctx_global_init();
     grpc_channel_init_init();
-    grpc_lb_policy_registry_init(grpc_pick_first_lb_factory_create());
-    grpc_register_lb_policy(grpc_pick_first_lb_factory_create());
-    grpc_register_lb_policy(grpc_round_robin_lb_factory_create());
+    grpc_lb_policy_registry_init();
     grpc_resolver_registry_init(GRPC_DEFAULT_NAME_PREFIX);
     grpc_register_resolver_type(grpc_dns_resolver_factory_create());
     grpc_register_resolver_type(grpc_ipv4_resolver_factory_create());
     grpc_register_resolver_type(grpc_ipv6_resolver_factory_create());
-#ifdef GPR_POSIX_SOCKET
+#ifdef GPR_HAVE_UNIX_SOCKET
     grpc_register_resolver_type(grpc_unix_resolver_factory_create());
 #endif
     grpc_register_tracer("api", &grpc_api_trace);