feat(bigtable): lower the value for max rpc channels as channel resize is slow (1m, 2 channel) (#2656)

sushanb · web-flow · commit d8055c1fb75a · 2025-08-11T22:26:25.000Z
…conservative Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly: - [ ] Make sure to open an issue as a [bug/issue](https://togithub.com/googleapis/java-bigtable/issues/new/choose) before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea - [ ] Ensure the tests and linter pass - [ ] Code coverage does not decrease (if any source code was changed) - [ ] Appropriate docs were updated (if necessary) - [ ] Rollback plan is reviewed and LGTMed - [ ] All new data plane features have a completed end to end testing plan Fixes #<issue_number_goes_here> ☕️ If you write sample code, please follow the [samples format]( https://togithub.com/GoogleCloudPlatform/java-docs-samples/blob/main/SAMPLE_FORMAT.md).
diff --git a/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettings.java b/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettings.java
@@ -446,7 +446,9 @@ public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProvi
             ChannelPoolSettings.builder()
                 .setInitialChannelCount(10)
                 .setMinRpcsPerChannel(1)
-                .setMaxRpcsPerChannel(50)
+                // Keep it conservative as we scale the channel size every 1min
+                // and delta is 2 channels.
+                .setMaxRpcsPerChannel(25)
                 .setPreemptiveRefreshEnabled(true)
                 .build())
         .setMaxInboundMessageSize(MAX_MESSAGE_SIZE)
