Github user uce commented on the issue:
https://github.com/apache/flink/pull/2652
OK thanks. I addressed one last issue with shutting down the watch dog
thread (it was lingering around sleeping and only noticed that the task has
terminated after that sleep... now the task canceler interrupts the watchdog
when everything works as expected and the watch dog thread terminates early).
I've also backported this to the `release-1.1` branch.
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