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fix(bigtable): disable SwitchingChannelPool when ChannelPoolConfiguration is empty - #14911
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This pull request introduces support for disabling the channel pool in SwitchingChannelPool by utilizing a new NoopChannelPool when the configuration is empty or default. It refactors delegate creation and config updates to seamlessly transition between enabled and disabled states, and adds a comprehensive test suite in SwitchingChannelPoolTest. The review feedback suggests a minor improvement in the test code to avoid reusing the same ArgumentCaptor instance across different mock verifications, which can lead to fragile tests.
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🤖 I have created a release *beep* *boop* --- <details><summary>1.97.0</summary> ## [1.97.0](v1.96.0...v1.97.0) (2026-11-12) ### ⚠ BREAKING CHANGES * **shopping-merchant:** remove discontinued Merchant API v1beta ([#14942](#14942)) ### Features * **bigquery-jdbc:** adds BigQuery graph integration to DatabaseMetadata methods ([#14930](#14930)) ([950b81b](950b81b)) * **gax:** implement resumable upload session resumption ([#14677](#14677)) ([24728d6](24728d6)) * **grpc-gcp:** add built-in channel_count metric for client library pools ([#14947](#14947)) ([712f043](712f043)) * **grpc-gcp:** add built-in channel_load metric for client library pools ([#14985](#14985)) ([9f87888](9f87888)) * **shopping-merchant:** remove discontinued Merchant API v1beta ([#14942](#14942)) ([2947dfd](2947dfd)) * **storage:** add StorageErrorTypeMapper for standard metrics ([#14694](#14694)) ([a9ac393](a9ac393)) * **storage:** add StorageMetricsContext for operation metrics state ([#14728](#14728)) ([edea395](edea395)) * **storage:** wire logical operation metrics in Retrying and StorageOptions ([#14695](#14695)) ([589c66c](589c66c)) * update API sources and regenerate ([#14958](#14958)) ([75944f3](75944f3)) ### Bug Fixes * **auth:** verify public/private key match with retries in mTLS keystore loading ([#14829](#14829)) ([096dbd6](096dbd6)) * **bigquery:** set QueryResultsFormat.ARROW in QueryArrow sample ([#14960](#14960)) ([c98e7c3](c98e7c3)) * **bigtable:** avoid triggering per-RPC credential session fallback on default call context ([#14961](#14961)) ([eb06d2c](eb06d2c)) * **bigtable:** copy Metadata per GetClientConfiguration call ([#14950](#14950)) ([278fe2f](278fe2f)) * **bigtable:** disable SwitchingChannelPool when ChannelPoolConfiguration is empty ([#14911](#14911)) ([fa24702](fa24702)) * **bigtable:** handle empty SessionPoolConfiguration in SessionPoolImpl and PoolSizer ([#14912](#14912)) ([cc7b235](cc7b235)) * **bigtable:** replace SessionPoolImpl Watchdog with per-session closeTimeout ([#14977](#14977)) ([a15acfb](a15acfb)) * **spanner-jdbc:** report database default isolation level ([#14929](#14929)) ([7e7595a](7e7595a)) * **spanner:** fix PG SHOW isolation level statements ([#14904](#14904)) ([bc917ed](bc917ed)) ### Dependencies * bump grpc to 1.85.1, opentelemetry to 1.67.0, and guava to 33.7.2-jre ([#14957](#14957)) ([1a27a00](1a27a00)) * bump guava to 33.7.1-jre and jspecify to 1.0.1 ([#14937](#14937)) ([1441527](1441527)) ### Documentation * **spanner:** update CHANGELOG.md for java spanner releases ([#14935](#14935)) ([956681e](956681e)) * **storage:** add Rapid Cache samples ([#14886](#14886)) ([e714f62](e714f62)) </details> --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). --------- Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
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Summary
When
session_load == 0across all scopes,ClientConfigurationManager.normalizeConfigclearssession_configuration, resulting in an emptyChannelPoolConfiguration.getDefaultInstance().This change updates
SwitchingChannelPoolto treat an emptyChannelPoolConfiguration(config.equals(ChannelPoolConfiguration.getDefaultInstance())) as disabled:NoopChannelPoolwhen disabled, which creates no underlying channels and immediately failsnewStreamwithStatus.UNAVAILABLE.NoopChannelPool) and enabled (ChannelPoolDpImpl/FallbackChannelPool/SingleChannelPool) onupdateConfigviareplaceChannelPool(createDelegate()), shutting down the active pool's channels when disabled.