Merge pull request #9269 from nathanielmanistaatgoogle/v1.0.x-upmerge

v1.0.x manual upmerge.
diff --git a/doc/cpp/perf_notes.md b/doc/cpp/perf_notes.md
new file mode 100644
index 0000000..805ead3
--- /dev/null
+++ b/doc/cpp/perf_notes.md
@@ -0,0 +1,29 @@
+# C++ Performance Notes
+
+## Streaming write buffering
+
+Generally, each write operation (Write(), WritesDone()) implies a syscall.
+gRPC will try to batch together separate write operations from different
+threads, but currently cannot automatically infer batching in a single stream.
+
+If message k+1 in a stream does not rely on responses from message k, it's
+possible to enable write batching by passing a WriteOptions argument to Write
+with the buffer_hint set:
+
+```c++
+stream_writer->Write(message, WriteOptions().set_buffer_hint());
+```
+
+The write will be buffered until one of the following is true:
+- the per-stream buffer is filled (controllable with the channel argument
+  GRPC_ARG_HTTP2_WRITE_BUFFER_SIZE) - this prevents infinite buffering leading
+  to OOM
+- a subsequent Write without buffer_hint set is posted
+- the call is finished for writing (WritesDone() called on the client,
+  or Finish() called on an async server stream, or the service handler returns
+  for a sync server stream)
+
+## Completion Queues and Threading in the Async API
+
+Right now, the best performance trade-off is having numcpu's threads and one
+completion queue per thread.
diff --git a/doc/interop-test-descriptions.md b/doc/interop-test-descriptions.md
index 96d1f2b..da3b976 100644
--- a/doc/interop-test-descriptions.md
+++ b/doc/interop-test-descriptions.md
@@ -716,7 +716,9 @@
 
     ```
     {
-      response_size: 314159
+      response_parameters:{
+        size: 314159
+      }
       payload:{
         body: 271828 bytes of zeros
       }
diff --git a/src/core/ext/client_channel/channel_connectivity.c b/src/core/ext/client_channel/channel_connectivity.c
index b10f444..dd70bc2 100644
--- a/src/core/ext/client_channel/channel_connectivity.c
+++ b/src/core/ext/client_channel/channel_connectivity.c
@@ -76,6 +76,7 @@
   gpr_mu mu;
   callback_phase phase;
   grpc_closure on_complete;
+  grpc_closure on_timeout;
   grpc_timer alarm;
   grpc_connectivity_state state;
   grpc_completion_queue *cq;
@@ -200,6 +201,8 @@
   gpr_mu_init(&w->mu);
   grpc_closure_init(&w->on_complete, watch_complete, w,
                     grpc_schedule_on_exec_ctx);
+  grpc_closure_init(&w->on_timeout, timeout_complete, w,
+                    grpc_schedule_on_exec_ctx);
   w->phase = WAITING;
   w->state = last_observed_state;
   w->cq = cq;
@@ -208,7 +211,7 @@
 
   grpc_timer_init(&exec_ctx, &w->alarm,
                   gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
-                  timeout_complete, w, gpr_now(GPR_CLOCK_MONOTONIC));
+                  &w->on_timeout, gpr_now(GPR_CLOCK_MONOTONIC));
 
   if (client_channel_elem->filter == &grpc_client_channel_filter) {
     GRPC_CHANNEL_INTERNAL_REF(channel, "watch_channel_connectivity");
diff --git a/src/core/ext/client_channel/subchannel.c b/src/core/ext/client_channel/subchannel.c
index fad5c69..1bac82b 100644
--- a/src/core/ext/client_channel/subchannel.c
+++ b/src/core/ext/client_channel/subchannel.c
@@ -109,6 +109,9 @@
   /** callback for connection finishing */
   grpc_closure connected;
 
+  /** callback for our alarm */
+  grpc_closure on_alarm;
+
   /** pollset_set tracking who's interested in a connection
       being setup */
   grpc_pollset_set *pollset_set;
@@ -483,7 +486,8 @@
       gpr_log(GPR_INFO, "Retry in %" PRId64 ".%09d seconds",
               time_til_next.tv_sec, time_til_next.tv_nsec);
     }
-    grpc_timer_init(exec_ctx, &c->alarm, c->next_attempt, on_alarm, c, now);
+    grpc_closure_init(&c->on_alarm, on_alarm, c, grpc_schedule_on_exec_ctx);
+    grpc_timer_init(exec_ctx, &c->alarm, c->next_attempt, &c->on_alarm, now);
   }
 }
 
diff --git a/src/core/ext/lb_policy/grpclb/grpclb.c b/src/core/ext/lb_policy/grpclb/grpclb.c
index 2d48a3a..97f98df 100644
--- a/src/core/ext/lb_policy/grpclb/grpclb.c
+++ b/src/core/ext/lb_policy/grpclb/grpclb.c
@@ -327,6 +327,9 @@
   /* A response from the LB server has been received. Process it */
   grpc_closure lb_on_response_received;
 
+  /* LB call retry timer callback. */
+  grpc_closure lb_on_call_retry;
+
   grpc_call *lb_call; /* streaming call to the LB server, */
 
   grpc_metadata_array lb_initial_metadata_recv; /* initial MD from LB server */
@@ -1364,8 +1367,10 @@
       }
     }
     GRPC_LB_POLICY_WEAK_REF(&glb_policy->base, "grpclb_retry_timer");
+    grpc_closure_init(&glb_policy->lb_on_call_retry, lb_call_on_retry_timer,
+                      glb_policy, grpc_schedule_on_exec_ctx);
     grpc_timer_init(exec_ctx, &glb_policy->lb_call_retry_timer, next_try,
-                    lb_call_on_retry_timer, glb_policy, now);
+                    &glb_policy->lb_on_call_retry, now);
   }
   gpr_mu_unlock(&glb_policy->mu);
   GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &glb_policy->base,
diff --git a/src/core/ext/resolver/dns/native/dns_resolver.c b/src/core/ext/resolver/dns/native/dns_resolver.c
index 124b16b..bb2b012 100644
--- a/src/core/ext/resolver/dns/native/dns_resolver.c
+++ b/src/core/ext/resolver/dns/native/dns_resolver.c
@@ -81,6 +81,7 @@
   /** retry timer */
   bool have_retry_timer;
   grpc_timer retry_timer;
+  grpc_closure on_retry;
   /** retry backoff state */
   gpr_backoff backoff_state;
 
@@ -199,8 +200,9 @@
     } else {
       gpr_log(GPR_DEBUG, "retrying immediately");
     }
-    grpc_timer_init(exec_ctx, &r->retry_timer, next_try, dns_on_retry_timer, r,
-                    now);
+    grpc_closure_init(&r->on_retry, dns_on_retry_timer, r,
+                      grpc_schedule_on_exec_ctx);
+    grpc_timer_init(exec_ctx, &r->retry_timer, next_try, &r->on_retry, now);
   }
   if (r->resolved_result != NULL) {
     grpc_channel_args_destroy(exec_ctx, r->resolved_result);
diff --git a/src/core/ext/transport/chttp2/transport/chttp2_transport.c b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
index 770a070..8fe12a2 100644
--- a/src/core/ext/transport/chttp2/transport/chttp2_transport.c
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
@@ -47,6 +47,7 @@
 #include "src/core/ext/transport/chttp2/transport/http2_errors.h"
 #include "src/core/ext/transport/chttp2/transport/internal.h"
 #include "src/core/ext/transport/chttp2/transport/status_conversion.h"
+#include "src/core/ext/transport/chttp2/transport/varint.h"
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/http/parser.h"
 #include "src/core/lib/iomgr/workqueue.h"
@@ -1676,8 +1677,9 @@
 
     if (optional_message != NULL) {
       size_t msg_len = strlen(optional_message);
-      GPR_ASSERT(msg_len < 127);
-      message_pfx = grpc_slice_malloc(15);
+      GPR_ASSERT(msg_len <= UINT32_MAX);
+      uint32_t msg_len_len = GRPC_CHTTP2_VARINT_LENGTH((uint32_t)msg_len, 0);
+      message_pfx = grpc_slice_malloc(14 + msg_len_len);
       p = GRPC_SLICE_START_PTR(message_pfx);
       *p++ = 0x40;
       *p++ = 12; /* len(grpc-message) */
@@ -1693,7 +1695,9 @@
       *p++ = 'a';
       *p++ = 'g';
       *p++ = 'e';
-      *p++ = (uint8_t)msg_len;
+      GRPC_CHTTP2_WRITE_VARINT((uint32_t)msg_len, 0, 0, p,
+                               (uint32_t)msg_len_len);
+      p += msg_len_len;
       GPR_ASSERT(p == GRPC_SLICE_END_PTR(message_pfx));
       len += (uint32_t)GRPC_SLICE_LENGTH(message_pfx);
       len += (uint32_t)msg_len;
diff --git a/src/core/lib/channel/deadline_filter.c b/src/core/lib/channel/deadline_filter.c
index 8dd6d09..a45a4d4 100644
--- a/src/core/lib/channel/deadline_filter.c
+++ b/src/core/lib/channel/deadline_filter.c
@@ -83,8 +83,11 @@
     // Take a reference to the call stack, to be owned by the timer.
     GRPC_CALL_STACK_REF(deadline_state->call_stack, "deadline_timer");
     deadline_state->timer_pending = true;
-    grpc_timer_init(exec_ctx, &deadline_state->timer, deadline, timer_callback,
-                    elem, gpr_now(GPR_CLOCK_MONOTONIC));
+    grpc_closure_init(&deadline_state->timer_callback, timer_callback, elem,
+                      grpc_schedule_on_exec_ctx);
+    grpc_timer_init(exec_ctx, &deadline_state->timer, deadline,
+                    &deadline_state->timer_callback,
+                    gpr_now(GPR_CLOCK_MONOTONIC));
   }
 }
 static void start_timer_if_needed(grpc_exec_ctx* exec_ctx,
diff --git a/src/core/lib/channel/deadline_filter.h b/src/core/lib/channel/deadline_filter.h
index 716a852..bd2b84f 100644
--- a/src/core/lib/channel/deadline_filter.h
+++ b/src/core/lib/channel/deadline_filter.h
@@ -46,6 +46,7 @@
   bool timer_pending;
   // The deadline timer.
   grpc_timer timer;
+  grpc_closure timer_callback;
   // Closure to invoke when the call is complete.
   // We use this to cancel the timer.
   grpc_closure on_complete;
diff --git a/src/core/lib/channel/handshaker.c b/src/core/lib/channel/handshaker.c
index ff82752..c052ca5 100644
--- a/src/core/lib/channel/handshaker.c
+++ b/src/core/lib/channel/handshaker.c
@@ -86,6 +86,7 @@
   grpc_tcp_server_acceptor* acceptor;
   // Deadline timer across all handshakers.
   grpc_timer deadline_timer;
+  grpc_closure on_timeout;
   // The final callback and user_data to invoke after the last handshaker.
   grpc_closure on_handshake_done;
   void* user_data;
@@ -224,9 +225,11 @@
                     grpc_schedule_on_exec_ctx);
   // Start deadline timer, which owns a ref.
   gpr_ref(&mgr->refs);
+  grpc_closure_init(&mgr->on_timeout, on_timeout, mgr,
+                    grpc_schedule_on_exec_ctx);
   grpc_timer_init(exec_ctx, &mgr->deadline_timer,
                   gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
-                  on_timeout, mgr, gpr_now(GPR_CLOCK_MONOTONIC));
+                  &mgr->on_timeout, gpr_now(GPR_CLOCK_MONOTONIC));
   // Start first handshaker, which also owns a ref.
   gpr_ref(&mgr->refs);
   bool done = call_next_handshaker_locked(exec_ctx, mgr, GRPC_ERROR_NONE);
diff --git a/src/core/lib/iomgr/tcp_client_posix.c b/src/core/lib/iomgr/tcp_client_posix.c
index c8237dc..9a77c92 100644
--- a/src/core/lib/iomgr/tcp_client_posix.c
+++ b/src/core/lib/iomgr/tcp_client_posix.c
@@ -65,6 +65,7 @@
   grpc_fd *fd;
   gpr_timespec deadline;
   grpc_timer alarm;
+  grpc_closure on_alarm;
   int refs;
   grpc_closure write_closure;
   grpc_pollset_set *interested_parties;
@@ -352,9 +353,10 @@
   }
 
   gpr_mu_lock(&ac->mu);
+  grpc_closure_init(&ac->on_alarm, tc_on_alarm, ac, grpc_schedule_on_exec_ctx);
   grpc_timer_init(exec_ctx, &ac->alarm,
                   gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
-                  tc_on_alarm, ac, gpr_now(GPR_CLOCK_MONOTONIC));
+                  &ac->on_alarm, gpr_now(GPR_CLOCK_MONOTONIC));
   grpc_fd_notify_on_write(exec_ctx, ac->fd, &ac->write_closure);
   gpr_mu_unlock(&ac->mu);
 
diff --git a/src/core/lib/iomgr/tcp_client_uv.c b/src/core/lib/iomgr/tcp_client_uv.c
index ed0de50..5225a54 100644
--- a/src/core/lib/iomgr/tcp_client_uv.c
+++ b/src/core/lib/iomgr/tcp_client_uv.c
@@ -49,6 +49,7 @@
 typedef struct grpc_uv_tcp_connect {
   uv_connect_t connect_req;
   grpc_timer alarm;
+  grpc_closure on_alarm;
   uv_tcp_t *tcp_handle;
   grpc_closure *closure;
   grpc_endpoint **endpoint;
@@ -148,9 +149,11 @@
   uv_tcp_connect(&connect->connect_req, connect->tcp_handle,
                  (const struct sockaddr *)resolved_addr->addr,
                  uv_tc_on_connect);
+  grpc_closure_init(&connect->on_alarm, uv_tc_on_alarm, connect,
+                    grpc_schedule_on_exec_ctx);
   grpc_timer_init(exec_ctx, &connect->alarm,
                   gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
-                  uv_tc_on_alarm, connect, gpr_now(GPR_CLOCK_MONOTONIC));
+                  &connect->on_alarm, gpr_now(GPR_CLOCK_MONOTONIC));
 }
 
 // overridden by api_fuzzer.c
diff --git a/src/core/lib/iomgr/tcp_client_windows.c b/src/core/lib/iomgr/tcp_client_windows.c
index 275258e..1e84ec3 100644
--- a/src/core/lib/iomgr/tcp_client_windows.c
+++ b/src/core/lib/iomgr/tcp_client_windows.c
@@ -58,6 +58,7 @@
   grpc_winsocket *socket;
   gpr_timespec deadline;
   grpc_timer alarm;
+  grpc_closure on_alarm;
   char *addr_name;
   int refs;
   grpc_closure on_connect;
@@ -229,7 +230,8 @@
   ac->resource_quota = resource_quota;
   grpc_closure_init(&ac->on_connect, on_connect, ac, grpc_schedule_on_exec_ctx);
 
-  grpc_timer_init(exec_ctx, &ac->alarm, deadline, on_alarm, ac,
+  grpc_closure_init(&ac->on_alarm, on_alarm, ac, grpc_schedule_on_exec_ctx);
+  grpc_timer_init(exec_ctx, &ac->alarm, deadline, &ac->on_alarm,
                   gpr_now(GPR_CLOCK_MONOTONIC));
   grpc_socket_notify_on_write(exec_ctx, socket, &ac->on_connect);
   return;
diff --git a/src/core/lib/iomgr/timer.h b/src/core/lib/iomgr/timer.h
index 20fe98c..d84a278 100644
--- a/src/core/lib/iomgr/timer.h
+++ b/src/core/lib/iomgr/timer.h
@@ -49,15 +49,15 @@
 
 typedef struct grpc_timer grpc_timer;
 
-/* Initialize *timer. When expired or canceled, timer_cb will be called with
-   *timer_cb_arg and error set to indicate if it expired (GRPC_ERROR_NONE) or
-   was canceled (GRPC_ERROR_CANCELLED). timer_cb is guaranteed to be called
-   exactly once, and application code should check the error to determine
-   how it was invoked. The application callback is also responsible for
-   maintaining information about when to free up any user-level state. */
+/* Initialize *timer. When expired or canceled, closure will be called with
+   error set to indicate if it expired (GRPC_ERROR_NONE) or was canceled
+   (GRPC_ERROR_CANCELLED). timer_cb is guaranteed to be called exactly once, and
+   application code should check the error to determine how it was invoked. The
+   application callback is also responsible for maintaining information about
+   when to free up any user-level state. */
 void grpc_timer_init(grpc_exec_ctx *exec_ctx, grpc_timer *timer,
-                     gpr_timespec deadline, grpc_iomgr_cb_func timer_cb,
-                     void *timer_cb_arg, gpr_timespec now);
+                     gpr_timespec deadline, grpc_closure *closure,
+                     gpr_timespec now);
 
 /* Note that there is no timer destroy function. This is because the
    timer is a one-time occurrence with a guarantee that the callback will
diff --git a/src/core/lib/iomgr/timer_generic.c b/src/core/lib/iomgr/timer_generic.c
index ecd3b28..40c8351 100644
--- a/src/core/lib/iomgr/timer_generic.c
+++ b/src/core/lib/iomgr/timer_generic.c
@@ -178,28 +178,27 @@
 }
 
 void grpc_timer_init(grpc_exec_ctx *exec_ctx, grpc_timer *timer,
-                     gpr_timespec deadline, grpc_iomgr_cb_func timer_cb,
-                     void *timer_cb_arg, gpr_timespec now) {
+                     gpr_timespec deadline, grpc_closure *closure,
+                     gpr_timespec now) {
   int is_first_timer = 0;
   shard_type *shard = &g_shards[shard_idx(timer)];
   GPR_ASSERT(deadline.clock_type == g_clock_type);
   GPR_ASSERT(now.clock_type == g_clock_type);
-  grpc_closure_init(&timer->closure, timer_cb, timer_cb_arg,
-                    grpc_schedule_on_exec_ctx);
+  timer->closure = closure;
   timer->deadline = deadline;
   timer->triggered = 0;
 
   if (!g_initialized) {
     timer->triggered = 1;
     grpc_closure_sched(
-        exec_ctx, &timer->closure,
+        exec_ctx, timer->closure,
         GRPC_ERROR_CREATE("Attempt to create timer before initialization"));
     return;
   }
 
   if (gpr_time_cmp(deadline, now) <= 0) {
     timer->triggered = 1;
-    grpc_closure_sched(exec_ctx, &timer->closure, GRPC_ERROR_NONE);
+    grpc_closure_sched(exec_ctx, timer->closure, GRPC_ERROR_NONE);
     return;
   }
 
@@ -251,7 +250,7 @@
   shard_type *shard = &g_shards[shard_idx(timer)];
   gpr_mu_lock(&shard->mu);
   if (!timer->triggered) {
-    grpc_closure_sched(exec_ctx, &timer->closure, GRPC_ERROR_CANCELLED);
+    grpc_closure_sched(exec_ctx, timer->closure, GRPC_ERROR_CANCELLED);
     timer->triggered = 1;
     if (timer->heap_index == INVALID_HEAP_INDEX) {
       list_remove(timer);
@@ -317,7 +316,7 @@
   grpc_timer *timer;
   gpr_mu_lock(&shard->mu);
   while ((timer = pop_one(shard, now))) {
-    grpc_closure_sched(exec_ctx, &timer->closure, GRPC_ERROR_REF(error));
+    grpc_closure_sched(exec_ctx, timer->closure, GRPC_ERROR_REF(error));
     n++;
   }
   *new_min_deadline = compute_min_deadline(shard);
diff --git a/src/core/lib/iomgr/timer_generic.h b/src/core/lib/iomgr/timer_generic.h
index e4494ad..9d901c7 100644
--- a/src/core/lib/iomgr/timer_generic.h
+++ b/src/core/lib/iomgr/timer_generic.h
@@ -43,7 +43,7 @@
   int triggered;
   struct grpc_timer *next;
   struct grpc_timer *prev;
-  grpc_closure closure;
+  grpc_closure *closure;
 };
 
 #endif /* GRPC_CORE_LIB_IOMGR_TIMER_GENERIC_H */
diff --git a/src/core/lib/iomgr/timer_uv.c b/src/core/lib/iomgr/timer_uv.c
index 00b835f..fa2cdee 100644
--- a/src/core/lib/iomgr/timer_uv.c
+++ b/src/core/lib/iomgr/timer_uv.c
@@ -55,21 +55,20 @@
   grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
   GPR_ASSERT(!timer->triggered);
   timer->triggered = 1;
-  grpc_closure_sched(&exec_ctx, &timer->closure, GRPC_ERROR_NONE);
+  grpc_closure_sched(&exec_ctx, timer->closure, GRPC_ERROR_NONE);
   stop_uv_timer(handle);
   grpc_exec_ctx_finish(&exec_ctx);
 }
 
 void grpc_timer_init(grpc_exec_ctx *exec_ctx, grpc_timer *timer,
-                     gpr_timespec deadline, grpc_iomgr_cb_func timer_cb,
-                     void *timer_cb_arg, gpr_timespec now) {
+                     gpr_timespec deadline, grpc_closure *closure,
+                     gpr_timespec now) {
   uint64_t timeout;
   uv_timer_t *uv_timer;
-  grpc_closure_init(&timer->closure, timer_cb, timer_cb_arg,
-                    grpc_schedule_on_exec_ctx);
+  timer->closure = closure;
   if (gpr_time_cmp(deadline, now) <= 0) {
     timer->triggered = 1;
-    grpc_closure_sched(exec_ctx, &timer->closure, GRPC_ERROR_NONE);
+    grpc_closure_sched(exec_ctx, timer->closure, GRPC_ERROR_NONE);
     return;
   }
   timer->triggered = 0;
@@ -84,7 +83,7 @@
 void grpc_timer_cancel(grpc_exec_ctx *exec_ctx, grpc_timer *timer) {
   if (!timer->triggered) {
     timer->triggered = 1;
-    grpc_closure_sched(exec_ctx, &timer->closure, GRPC_ERROR_CANCELLED);
+    grpc_closure_sched(exec_ctx, timer->closure, GRPC_ERROR_CANCELLED);
     stop_uv_timer((uv_timer_t *)timer->uv_timer);
   }
 }
diff --git a/src/core/lib/iomgr/timer_uv.h b/src/core/lib/iomgr/timer_uv.h
index 3de383e..13cf8bd 100644
--- a/src/core/lib/iomgr/timer_uv.h
+++ b/src/core/lib/iomgr/timer_uv.h
@@ -37,7 +37,7 @@
 #include "src/core/lib/iomgr/exec_ctx.h"
 
 struct grpc_timer {
-  grpc_closure closure;
+  grpc_closure *closure;
   /* This is actually a uv_timer_t*, but we want to keep platform-specific
      types out of headers */
   void *uv_timer;
diff --git a/src/core/lib/surface/alarm.c b/src/core/lib/surface/alarm.c
index aa9d60e..e71c0eb 100644
--- a/src/core/lib/surface/alarm.c
+++ b/src/core/lib/surface/alarm.c
@@ -38,6 +38,7 @@
 
 struct grpc_alarm {
   grpc_timer alarm;
+  grpc_closure on_alarm;
   grpc_cq_completion completion;
   /** completion queue where events about this alarm will be posted */
   grpc_completion_queue *cq;
@@ -64,9 +65,11 @@
   alarm->tag = tag;
 
   grpc_cq_begin_op(cq, tag);
+  grpc_closure_init(&alarm->on_alarm, alarm_cb, alarm,
+                    grpc_schedule_on_exec_ctx);
   grpc_timer_init(&exec_ctx, &alarm->alarm,
                   gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
-                  alarm_cb, alarm, gpr_now(GPR_CLOCK_MONOTONIC));
+                  &alarm->on_alarm, gpr_now(GPR_CLOCK_MONOTONIC));
   grpc_exec_ctx_finish(&exec_ctx);
   return alarm;
 }
diff --git a/src/node/interop/interop_client.js b/src/node/interop/interop_client.js
index 46ddecf..75cfb41 100644
--- a/src/node/interop/interop_client.js
+++ b/src/node/interop/interop_client.js
@@ -312,6 +312,9 @@
     }
   };
   var streaming_arg = {
+    response_parameters: [
+     {size: 314159}
+    ],
     payload: {
       body: zeroBuffer(271828)
     }
diff --git a/src/php/tests/interop/interop_client.php b/src/php/tests/interop/interop_client.php
index d201915..2acf561 100755
--- a/src/php/tests/interop/interop_client.php
+++ b/src/php/tests/interop/interop_client.php
@@ -451,11 +451,22 @@
 
     $streaming_request = new grpc\testing\StreamingOutputCallRequest();
     $streaming_request->setPayload($payload);
+    $response_parameters = new grpc\testing\ResponseParameters();
+    $response_parameters->setSize($response_len);
+    $streaming_request->getResponseParameters()[] = $response_parameters;
     $streaming_call->write($streaming_request);
     $streaming_call->writesDone();
+    $result = $streaming_call->read();
 
     hardAssertIfStatusOk($streaming_call->getStatus());
 
+    $streaming_initial_metadata = $streaming_call->getMetadata();
+    hardAssert(array_key_exists($ECHO_INITIAL_KEY, $streaming_initial_metadata),
+               'Initial metadata does not contain expected key');
+    hardAssert(
+        $streaming_initial_metadata[$ECHO_INITIAL_KEY][0] === $ECHO_INITIAL_VALUE,
+        'Incorrect initial metadata value');
+
     $streaming_trailing_metadata = $streaming_call->getTrailingMetadata();
     hardAssert(array_key_exists($ECHO_TRAILING_KEY,
                                 $streaming_trailing_metadata),
diff --git a/test/core/end2end/fuzzers/api_fuzzer.c b/test/core/end2end/fuzzers/api_fuzzer.c
index 6c7cbad..200a518 100644
--- a/test/core/end2end/fuzzers/api_fuzzer.c
+++ b/test/core/end2end/fuzzers/api_fuzzer.c
@@ -369,10 +369,11 @@
   r->addr = gpr_strdup(addr);
   r->on_done = on_done;
   r->addrs = addresses;
-  grpc_timer_init(exec_ctx, &r->timer,
-                  gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),
-                               gpr_time_from_seconds(1, GPR_TIMESPAN)),
-                  finish_resolve, r, gpr_now(GPR_CLOCK_MONOTONIC));
+  grpc_timer_init(
+      exec_ctx, &r->timer, gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),
+                                        gpr_time_from_seconds(1, GPR_TIMESPAN)),
+      grpc_closure_create(finish_resolve, r, grpc_schedule_on_exec_ctx),
+      gpr_now(GPR_CLOCK_MONOTONIC));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -430,10 +431,11 @@
   fc->closure = closure;
   fc->ep = ep;
   fc->deadline = deadline;
-  grpc_timer_init(exec_ctx, &fc->timer,
-                  gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),
-                               gpr_time_from_millis(1, GPR_TIMESPAN)),
-                  do_connect, fc, gpr_now(GPR_CLOCK_MONOTONIC));
+  grpc_timer_init(
+      exec_ctx, &fc->timer, gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),
+                                         gpr_time_from_millis(1, GPR_TIMESPAN)),
+      grpc_closure_create(do_connect, fc, grpc_schedule_on_exec_ctx),
+      gpr_now(GPR_CLOCK_MONOTONIC));
 }
 
 static void my_tcp_client_connect(grpc_exec_ctx *exec_ctx,
diff --git a/test/core/iomgr/timer_list_test.c b/test/core/iomgr/timer_list_test.c
index be8988a..8d7ac3f 100644
--- a/test/core/iomgr/timer_list_test.c
+++ b/test/core/iomgr/timer_list_test.c
@@ -57,17 +57,20 @@
 
   /* 10 ms timers.  will expire in the current epoch */
   for (i = 0; i < 10; i++) {
-    grpc_timer_init(&exec_ctx, &timers[i],
-                    gpr_time_add(start, gpr_time_from_millis(10, GPR_TIMESPAN)),
-                    cb, (void *)(intptr_t)i, start);
+    grpc_timer_init(
+        &exec_ctx, &timers[i],
+        gpr_time_add(start, gpr_time_from_millis(10, GPR_TIMESPAN)),
+        grpc_closure_create(cb, (void *)(intptr_t)i, grpc_schedule_on_exec_ctx),
+        start);
   }
 
   /* 1010 ms timers.  will expire in the next epoch */
   for (i = 10; i < 20; i++) {
     grpc_timer_init(
         &exec_ctx, &timers[i],
-        gpr_time_add(start, gpr_time_from_millis(1010, GPR_TIMESPAN)), cb,
-        (void *)(intptr_t)i, start);
+        gpr_time_add(start, gpr_time_from_millis(1010, GPR_TIMESPAN)),
+        grpc_closure_create(cb, (void *)(intptr_t)i, grpc_schedule_on_exec_ctx),
+        start);
   }
 
   /* collect timers.  Only the first batch should be ready. */
@@ -125,16 +128,26 @@
   grpc_timer_list_init(gpr_time_0(GPR_CLOCK_REALTIME));
   memset(cb_called, 0, sizeof(cb_called));
 
-  grpc_timer_init(&exec_ctx, &timers[0], tfm(100), cb, (void *)(intptr_t)0,
-                  gpr_time_0(GPR_CLOCK_REALTIME));
-  grpc_timer_init(&exec_ctx, &timers[1], tfm(3), cb, (void *)(intptr_t)1,
-                  gpr_time_0(GPR_CLOCK_REALTIME));
-  grpc_timer_init(&exec_ctx, &timers[2], tfm(100), cb, (void *)(intptr_t)2,
-                  gpr_time_0(GPR_CLOCK_REALTIME));
-  grpc_timer_init(&exec_ctx, &timers[3], tfm(3), cb, (void *)(intptr_t)3,
-                  gpr_time_0(GPR_CLOCK_REALTIME));
-  grpc_timer_init(&exec_ctx, &timers[4], tfm(1), cb, (void *)(intptr_t)4,
-                  gpr_time_0(GPR_CLOCK_REALTIME));
+  grpc_timer_init(
+      &exec_ctx, &timers[0], tfm(100),
+      grpc_closure_create(cb, (void *)(intptr_t)0, grpc_schedule_on_exec_ctx),
+      gpr_time_0(GPR_CLOCK_REALTIME));
+  grpc_timer_init(
+      &exec_ctx, &timers[1], tfm(3),
+      grpc_closure_create(cb, (void *)(intptr_t)1, grpc_schedule_on_exec_ctx),
+      gpr_time_0(GPR_CLOCK_REALTIME));
+  grpc_timer_init(
+      &exec_ctx, &timers[2], tfm(100),
+      grpc_closure_create(cb, (void *)(intptr_t)2, grpc_schedule_on_exec_ctx),
+      gpr_time_0(GPR_CLOCK_REALTIME));
+  grpc_timer_init(
+      &exec_ctx, &timers[3], tfm(3),
+      grpc_closure_create(cb, (void *)(intptr_t)3, grpc_schedule_on_exec_ctx),
+      gpr_time_0(GPR_CLOCK_REALTIME));
+  grpc_timer_init(
+      &exec_ctx, &timers[4], tfm(1),
+      grpc_closure_create(cb, (void *)(intptr_t)4, grpc_schedule_on_exec_ctx),
+      gpr_time_0(GPR_CLOCK_REALTIME));
   GPR_ASSERT(1 == grpc_timer_check(&exec_ctx, tfm(2), NULL));
   grpc_exec_ctx_finish(&exec_ctx);
   GPR_ASSERT(1 == cb_called[4][1]);
diff --git a/tools/run_tests/run_interop_tests.py b/tools/run_tests/run_interop_tests.py
index c14f18a..981e38b 100755
--- a/tools/run_tests/run_interop_tests.py
+++ b/tools/run_tests/run_interop_tests.py
@@ -179,10 +179,10 @@
     return {}
 
   def unimplemented_test_cases(self):
-    return _SKIP_ADVANCED + _SKIP_COMPRESSION
+    return _SKIP_COMPRESSION
 
   def unimplemented_test_cases_server(self):
-    return _SKIP_ADVANCED + _SKIP_COMPRESSION
+    return _SKIP_COMPRESSION
 
   def __str__(self):
     return 'java'