scwhittle opened a new pull request #11364: [BEAM-9651] Prevent StreamPool and stream initialization livelock URL: https://github.com/apache/beam/pull/11364 Reduce StreamPool synchronized block section to not include stream creation which includes sending initial messages. Additionally remove it from being required to release holds. Some pipelines were observing stuck get and release methods on synchronization. This was due to a stuck stream creation waiting for the onReady callback. This could possibly have been due to the callback being queued behind other callbacks on blocked grpc threads. This was addressed in the DirectStreamObserver used for the fn api so we reuse it here. ------------------------ Thank you for your contribution! 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