Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/186#issuecomment-38191649
I haven't tested this yet, but it looks to me that in instances of
preRestart where we have a DAGSchedulerEvent message and that event is one that
includes a jobId or task, then we should call handleJobCancellation on just
the one job, not on all running jobs.
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