[jira] [Created] (FLINK-6319) Add timeout when shutting SystemProcessingTimeService down

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-6319:
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             Summary: Add timeout when shutting SystemProcessingTimeService down
                 Key: FLINK-6319
                 URL: https://issues.apache.org/jira/browse/FLINK-6319
             Project: Flink
          Issue Type: Improvement
          Components: Local Runtime
    Affects Versions: 1.3.0
            Reporter: Till Rohrmann
            Priority: Minor


A user noted that we simply call {{shutdownNow}} on the {{SystemProcessingTimeService's}} {{ScheduledThreadpoolExecutor}} when calling {{SystemProcessingTimeService.shutdownService}}. {{shutdowNow}} will halt all waiting tasks but it won't wait until the currently running tasks have been completed. This can lead to unwanted runtime behaviours such as wrong termination orders when shutting down tasks (as reported in FLINK-4973).

I propose to add a small timeout to wait for currently running tasks to complete. Even though this problem cannot be completely solved since timer tasks might take longer than the specified timeout, a timeout for waiting for running tasks to complete will mitigate the problem.

We can do this by calling {{timerServicer.awaitTermination(timeout, timeoutUnit);}} after the {{shutdowNow}} call.



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