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[jira] [Created] (FLINK-9845) Make InternalTimerService's timer processing interruptible/abortable


Till Rohrmann created FLINK-9845:
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             Summary: Make InternalTimerService's timer processing interruptible/abortable
                 Key: FLINK-9845
                 URL: https://issues.apache.org/jira/browse/FLINK-9845
             Project: Flink
          Issue Type: Improvement
          Components: State Backends, Checkpointing
    Affects Versions: 1.5.1, 1.6.0
            Reporter: Till Rohrmann
             Fix For: 1.7.0


When cancelling a {{Task}}, the task thread might currently process the timers registered at the {{InternalTimerService}}. Depending on the timer action, this might take a while and, thus, blocks the cancellation of the {{Task}}. In the most extreme case, the {{TaskCancelerWatchDog}} kicks in and kills the whole {{TaskManager}} process.

In order to alleviate the problem (speed up the cancellation reaction), we should make the processing of the timers interruptible/abortable. This means that instead of processing all timers we should check in between timers whether the {{Task}} is currently being cancelled or not. If this is the case, then we should directly stop processing the remaining timers and return.



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