Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/247#issuecomment-39401108
@witgo I completely agree that a better lifecycle interface is necessary.
That has been addressed by a different PR #300. This PR only adds the changes
necessary to the other components of the system (NetworkInputTracker,
JobScheduler, JobGenerator, etc.) to allow graceful shutdown.
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