[PH2] New Experiments (#38103)

- Adding two experiments for promises based HTTP2 transport.
- We have kept client and server transport experiments separate to help with smoother roll outs and also help with interop testing.
- The experiments are disabled, we expect this project to take several months.

Closes #38103

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/38103 from tanvi-jagtap:client_server_transport_experiment 53a24bda04
PiperOrigin-RevId: 695606023

bazel/experiments.bzl

@@ -34,6 +34,8 @@ EXPERIMENT_ENABLES = {
     "monitoring_experiment": "monitoring_experiment",
     "multiping": "multiping",
     "pick_first_new": "pick_first_new",
+    "promise_based_http2_client_transport": "promise_based_http2_client_transport",
+    "promise_based_http2_server_transport": "promise_based_http2_server_transport",
     "promise_based_inproc_transport": "promise_based_inproc_transport",
     "rq_fast_reject": "rq_fast_reject",
     "schedule_cancellation_over_write": "schedule_cancellation_over_write",

src/core/lib/experiments/experiments.cc

@@ -86,6 +86,18 @@ const char* const additional_constraints_multiping = "{}";
 const char* const description_pick_first_new =
     "New pick_first impl with memory reduction.";
 const char* const additional_constraints_pick_first_new = "{}";
+const char* const description_promise_based_http2_client_transport =
+    "Use promises for the http2 client transport. We have kept client and "
+    "server transport experiments separate to help with smoother roll outs and "
+    "also help with interop testing.";
+const char* const additional_constraints_promise_based_http2_client_transport =
+    "{}";
+const char* const description_promise_based_http2_server_transport =
+    "Use promises for the http2 server transport. We have kept client and "
+    "server transport experiments separate to help with smoother roll outs and "
+    "also help with interop testing.";
+const char* const additional_constraints_promise_based_http2_server_transport =
+    "{}";
 const char* const description_promise_based_inproc_transport =
     "Use promises for the in-process transport.";
 const char* const additional_constraints_promise_based_inproc_transport = "{}";
@@ -172,6 +184,14 @@ const ExperimentMetadata g_experiment_metadata[] = {
      nullptr, 0, false, true},
     {"pick_first_new", description_pick_first_new,
      additional_constraints_pick_first_new, nullptr, 0, true, true},
+    {"promise_based_http2_client_transport",
+     description_promise_based_http2_client_transport,
+     additional_constraints_promise_based_http2_client_transport, nullptr, 0,
+     false, true},
+    {"promise_based_http2_server_transport",
+     description_promise_based_http2_server_transport,
+     additional_constraints_promise_based_http2_server_transport, nullptr, 0,
+     false, true},
     {"promise_based_inproc_transport",
      description_promise_based_inproc_transport,
      additional_constraints_promise_based_inproc_transport, nullptr, 0, false,
@@ -267,6 +287,18 @@ const char* const additional_constraints_multiping = "{}";
 const char* const description_pick_first_new =
     "New pick_first impl with memory reduction.";
 const char* const additional_constraints_pick_first_new = "{}";
+const char* const description_promise_based_http2_client_transport =
+    "Use promises for the http2 client transport. We have kept client and "
+    "server transport experiments separate to help with smoother roll outs and "
+    "also help with interop testing.";
+const char* const additional_constraints_promise_based_http2_client_transport =
+    "{}";
+const char* const description_promise_based_http2_server_transport =
+    "Use promises for the http2 server transport. We have kept client and "
+    "server transport experiments separate to help with smoother roll outs and "
+    "also help with interop testing.";
+const char* const additional_constraints_promise_based_http2_server_transport =
+    "{}";
 const char* const description_promise_based_inproc_transport =
     "Use promises for the in-process transport.";
 const char* const additional_constraints_promise_based_inproc_transport = "{}";
@@ -353,6 +385,14 @@ const ExperimentMetadata g_experiment_metadata[] = {
      nullptr, 0, false, true},
     {"pick_first_new", description_pick_first_new,
      additional_constraints_pick_first_new, nullptr, 0, true, true},
+    {"promise_based_http2_client_transport",
+     description_promise_based_http2_client_transport,
+     additional_constraints_promise_based_http2_client_transport, nullptr, 0,
+     false, true},
+    {"promise_based_http2_server_transport",
+     description_promise_based_http2_server_transport,
+     additional_constraints_promise_based_http2_server_transport, nullptr, 0,
+     false, true},
     {"promise_based_inproc_transport",
      description_promise_based_inproc_transport,
      additional_constraints_promise_based_inproc_transport, nullptr, 0, false,
@@ -448,6 +488,18 @@ const char* const additional_constraints_multiping = "{}";
 const char* const description_pick_first_new =
     "New pick_first impl with memory reduction.";
 const char* const additional_constraints_pick_first_new = "{}";
+const char* const description_promise_based_http2_client_transport =
+    "Use promises for the http2 client transport. We have kept client and "
+    "server transport experiments separate to help with smoother roll outs and "
+    "also help with interop testing.";
+const char* const additional_constraints_promise_based_http2_client_transport =
+    "{}";
+const char* const description_promise_based_http2_server_transport =
+    "Use promises for the http2 server transport. We have kept client and "
+    "server transport experiments separate to help with smoother roll outs and "
+    "also help with interop testing.";
+const char* const additional_constraints_promise_based_http2_server_transport =
+    "{}";
 const char* const description_promise_based_inproc_transport =
     "Use promises for the in-process transport.";
 const char* const additional_constraints_promise_based_inproc_transport = "{}";
@@ -534,6 +586,14 @@ const ExperimentMetadata g_experiment_metadata[] = {
      nullptr, 0, false, true},
     {"pick_first_new", description_pick_first_new,
      additional_constraints_pick_first_new, nullptr, 0, true, true},
+    {"promise_based_http2_client_transport",
+     description_promise_based_http2_client_transport,
+     additional_constraints_promise_based_http2_client_transport, nullptr, 0,
+     false, true},
+    {"promise_based_http2_server_transport",
+     description_promise_based_http2_server_transport,
+     additional_constraints_promise_based_http2_server_transport, nullptr, 0,
+     false, true},
     {"promise_based_inproc_transport",
      description_promise_based_inproc_transport,
      additional_constraints_promise_based_inproc_transport, nullptr, 0, false,

src/core/lib/experiments/experiments.h

@@ -79,6 +79,8 @@ inline bool IsMonitoringExperimentEnabled() { return true; }
 inline bool IsMultipingEnabled() { return false; }
 #define GRPC_EXPERIMENT_IS_INCLUDED_PICK_FIRST_NEW
 inline bool IsPickFirstNewEnabled() { return true; }
+inline bool IsPromiseBasedHttp2ClientTransportEnabled() { return false; }
+inline bool IsPromiseBasedHttp2ServerTransportEnabled() { return false; }
 inline bool IsPromiseBasedInprocTransportEnabled() { return false; }
 inline bool IsRqFastRejectEnabled() { return false; }
 inline bool IsScheduleCancellationOverWriteEnabled() { return false; }
@@ -119,6 +121,8 @@ inline bool IsMonitoringExperimentEnabled() { return true; }
 inline bool IsMultipingEnabled() { return false; }
 #define GRPC_EXPERIMENT_IS_INCLUDED_PICK_FIRST_NEW
 inline bool IsPickFirstNewEnabled() { return true; }
+inline bool IsPromiseBasedHttp2ClientTransportEnabled() { return false; }
+inline bool IsPromiseBasedHttp2ServerTransportEnabled() { return false; }
 inline bool IsPromiseBasedInprocTransportEnabled() { return false; }
 inline bool IsRqFastRejectEnabled() { return false; }
 inline bool IsScheduleCancellationOverWriteEnabled() { return false; }
@@ -159,6 +163,8 @@ inline bool IsMonitoringExperimentEnabled() { return true; }
 inline bool IsMultipingEnabled() { return false; }
 #define GRPC_EXPERIMENT_IS_INCLUDED_PICK_FIRST_NEW
 inline bool IsPickFirstNewEnabled() { return true; }
+inline bool IsPromiseBasedHttp2ClientTransportEnabled() { return false; }
+inline bool IsPromiseBasedHttp2ServerTransportEnabled() { return false; }
 inline bool IsPromiseBasedInprocTransportEnabled() { return false; }
 inline bool IsRqFastRejectEnabled() { return false; }
 inline bool IsScheduleCancellationOverWriteEnabled() { return false; }
@@ -193,6 +199,8 @@ enum ExperimentIds {
   kExperimentIdMonitoringExperiment,
   kExperimentIdMultiping,
   kExperimentIdPickFirstNew,
+  kExperimentIdPromiseBasedHttp2ClientTransport,
+  kExperimentIdPromiseBasedHttp2ServerTransport,
   kExperimentIdPromiseBasedInprocTransport,
   kExperimentIdRqFastReject,
   kExperimentIdScheduleCancellationOverWrite,
@@ -274,6 +282,14 @@ inline bool IsMultipingEnabled() {
 inline bool IsPickFirstNewEnabled() {
   return IsExperimentEnabled<kExperimentIdPickFirstNew>();
 }
+#define GRPC_EXPERIMENT_IS_INCLUDED_PROMISE_BASED_HTTP2_CLIENT_TRANSPORT
+inline bool IsPromiseBasedHttp2ClientTransportEnabled() {
+  return IsExperimentEnabled<kExperimentIdPromiseBasedHttp2ClientTransport>();
+}
+#define GRPC_EXPERIMENT_IS_INCLUDED_PROMISE_BASED_HTTP2_SERVER_TRANSPORT
+inline bool IsPromiseBasedHttp2ServerTransportEnabled() {
+  return IsExperimentEnabled<kExperimentIdPromiseBasedHttp2ServerTransport>();
+}
 #define GRPC_EXPERIMENT_IS_INCLUDED_PROMISE_BASED_INPROC_TRANSPORT
 inline bool IsPromiseBasedInprocTransportEnabled() {
   return IsExperimentEnabled<kExperimentIdPromiseBasedInprocTransport>();

src/core/lib/experiments/experiments.yaml

@@ -141,6 +141,24 @@
   expiry: 2025/03/01
   owner: roth@google.com
   test_tags: ["lb_unit_test", "cpp_lb_end2end_test", "xds_end2end_test"]
+- name: promise_based_http2_client_transport
+  description:
+    Use promises for the http2 client transport. We have kept client and
+    server transport experiments separate to help with smoother roll outs
+    and also help with interop testing.
+  expiry: 2025/06/03
+  owner: tjagtap@google.com
+  test_tags: []
+  allow_in_fuzzing_config: true
+- name: promise_based_http2_server_transport
+  description:
+    Use promises for the http2 server transport. We have kept client and
+    server transport experiments separate to help with smoother roll outs
+    and also help with interop testing.
+  expiry: 2025/06/03
+  owner: tjagtap@google.com
+  test_tags: []
+  allow_in_fuzzing_config: true
 - name: promise_based_inproc_transport
   description:
     Use promises for the in-process transport.

src/core/lib/experiments/rollouts.yaml

@@ -94,6 +94,10 @@
     ios: broken
     windows: broken
     posix: false
+- name: promise_based_http2_client_transport
+  default: false
+- name: promise_based_http2_server_transport
+  default: false
 - name: rstpit
   default: false
 - name: schedule_cancellation_over_write