Github user sarutak commented on the pull request:
https://github.com/apache/spark/pull/2001#issuecomment-53890682
Thank you for your comment, @tgravescs .
I think, it's better that sc.stop is invoked in shutdown hook as well as
ApplicationMaster, running Driver program in the same JVM.
Even If user forget to sc.stop in their program, ApplicationMaster's
shutdown hook invoke sc.stop.
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