scwhittle opened a new pull request #11368: [BEAM-9651] Prevent StreamPool and stream initialization livelock URL: https://github.com/apache/beam/pull/11368 Reduce StreamPool synchronized block by excluding stream creation and requiring it for release. Some Dataflow pipelines were observing stuck get and release methods due to stuck stream creation waiting for the onReady callback. The DirectStreamObserver is modified to additionally pool isReady() to handle cases where blocked threads are blocking the onReady callback. Additionally as we would prefer to possibly OOM versus becoming permanently stuck we give up waiting for onReady after a minute. This is a recommit of a reverted commit to allow for testing before merging. **Please** add a meaningful description for your change here ------------------------ Thank you for your contribution! 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