lukecwik opened a new pull request #17240:
URL: https://github.com/apache/beam/pull/17240
The issue was that the InboundObserver can be invoked before
outboundObserverFactory#outboundObserverFor returns meaning that
the server is waiting for a response for cache.remove but
cache.computeIfAbsent is being invoked at the same time.
Another issue was that the outstandingRequests map could be updated with
another request within GrpcStateClient during closeAndCleanup meaning that the
CompleteableFuture would never be completed exceptionally.
Ran unit test locally 1000 times and now never got stuck.
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