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https://issues.apache.org/jira/browse/FLINK-4715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15534797#comment-15534797
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Zhijiang Wang commented on FLINK-4715:
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Yes, we already experienced this problem in real production many times,
because the user code can not be controlled. If the thread is waiting for
synchronized lock or other cases, it can not be cancelled, and the job master
cancel the task failed many times, the job master will let the task manager
exit itself.
> TaskManager should commit suicide after cancellation failure
> ------------------------------------------------------------
>
> Key: FLINK-4715
> URL: https://issues.apache.org/jira/browse/FLINK-4715
> Project: Flink
> Issue Type: Improvement
> Components: TaskManager
> Affects Versions: 1.2.0
> Reporter: Till Rohrmann
> Fix For: 1.2.0
>
>
> In case of a failed cancellation, e.g. the task cannot be cancelled after a
> given time, the {{TaskManager}} should kill itself. That way we guarantee
> that there is no resource leak.
> This behaviour acts as a safety-net against faulty user code.
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