Github user mridulm commented on the pull request:
https://github.com/apache/incubator-spark/pull/628#issuecomment-35744380
remove will remove the task from the queue assuming it is not yet started :
but that should not be a problem - since task.kill sets flags such that it will
not execute for long even if it was not removed.
But once the task starts executing, unfortunately, there is no guaranteed
way to kill it.
You can try interrupting it - assuming the task responds to interruptions
(and does not gobble up InterruptedException : particularly since it is
executing user code).
But other than that, I can think of a good solution ...
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