shunping opened a new pull request, #30278:
URL: https://github.com/apache/beam/pull/30278
The test of `testCloseVisibleToAwaitCompletionCallerAndProducer` is flaky
due to a race condition.
There are two threads running (future and future2). Thread 2 may execute and
close the observer before Thread 1 reaching in the while loop. This will cause
`BeamFnDataInboundObserver.CloseException` thrown at calling `future.get()`.
The fix is just to let Thread2 wait a little time before closing the
observer, so that Thread 1 can reach into the infinite while loop.
I was able to reproduce the flake 10/10 prior to the fix, but after that I
have tested it about 30 times but seen no failure.
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