HeartSaVioR commented on issue #25808: [SPARK-29104][CORE][TESTS] Fix PipedRDDSuite to wait messages before checking thread termination URL: https://github.com/apache/spark/pull/25808#issuecomment-532021843 Could you elaborate how it helps to resolve flakiness? I'm seeing that `TaskContext.addTaskCompletionListener` doesn't seem to add listeners to the listener bus - it handles these listeners by its own, so wondering which event we want to ensure being handled in listenerBus before verifying.
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