runtime: make grpc client cache enabled by default(#19253)

Risk Level: low Testing: change testing to verify new behavior Docs Changes: n/a Release Notes: added Platform Specific Features: n/a Signed-off-by: chaoqin-li1123 <[email protected]>
envoyproxy · Jan 18, 2022 · 2d616e9 · 2d616e9
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diff --git a/docs/root/version_history/current.rst b/docs/root/version_history/current.rst
@@ -11,6 +11,7 @@ Minor Behavior Changes
 ----------------------
 *Changes that may cause incompatibilities for some users, but should not for most*
 
+* grpc: flip runtime guard ``envoy.reloadable_features.enable_grpc_async_client_cache`` to be default enabled. async grpc client created through getOrCreateRawAsyncClient will be cached by default.
 * http: now the max concurrent streams of http2 connection can not only be adjusted down according to the SETTINGS frame but also can be adjusted up, of course, it can not exceed the configured upper bounds. This fix is guarded by ``envoy.reloadable_features.http2_allow_capacity_increase_by_settings``.
 
 Bug Fixes

diff --git a/source/common/runtime/runtime_features.cc b/source/common/runtime/runtime_features.cc
@@ -62,6 +62,7 @@ constexpr const char* runtime_features[] = {
     "envoy.reloadable_features.correct_scheme_and_xfp",
     "envoy.reloadable_features.correctly_validate_alpn",
     "envoy.reloadable_features.disable_tls_inspector_injection",
+    "envoy.reloadable_features.enable_grpc_async_client_cache",
     "envoy.reloadable_features.fix_added_trailers",
     "envoy.reloadable_features.grpc_bridge_stats_disabled",
     "envoy.reloadable_features.handle_stream_reset_during_hcm_encoding",
@@ -111,10 +112,6 @@ constexpr const char* disabled_runtime_features[] = {
     "envoy.reloadable_features.allow_multiple_dns_addresses",
     // Sentinel and test flag.
     "envoy.reloadable_features.test_feature_false",
-    // When the runtime is flipped to true, use shared cache in getOrCreateRawAsyncClient method if
-    // CacheOption is CacheWhenRuntimeEnabled.
-    // Caller that use AlwaysCache option will always cache, unaffected by this runtime.
-    "envoy.reloadable_features.enable_grpc_async_client_cache",
     // TODO(dmitri-d) reset to true to enable unified mux by default
     "envoy.reloadable_features.unified_mux",
     // TODO(birenroy): flip to true in a future PR to enable by default

diff --git a/test/common/grpc/async_client_manager_impl_test.cc b/test/common/grpc/async_client_manager_impl_test.cc
@@ -128,6 +128,9 @@ TEST_F(AsyncClientManagerImplTest, EnvoyGrpcOk) {
 }
 
 TEST_F(AsyncClientManagerImplTest, DisableRawAsyncClientCache) {
+  TestScopedRuntime scoped_runtime;
+  Runtime::LoaderSingleton::getExisting()->mergeValues(
+      {{"envoy.reloadable_features.enable_grpc_async_client_cache", "false"}});
   envoy::config::core::v3::GrpcService grpc_service;
   grpc_service.mutable_envoy_grpc()->set_cluster_name("foo");
 
@@ -146,9 +149,6 @@ TEST_F(AsyncClientManagerImplTest, DisableRawAsyncClientCache) {
 }
 
 TEST_F(AsyncClientManagerImplTest, EnableRawAsyncClientCache) {
-  TestScopedRuntime scoped_runtime;
-  Runtime::LoaderSingleton::getExisting()->mergeValues(
-      {{"envoy.reloadable_features.enable_grpc_async_client_cache", "true"}});
   envoy::config::core::v3::GrpcService grpc_service;
   grpc_service.mutable_envoy_grpc()->set_cluster_name("foo");