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https://issues.apache.org/jira/browse/SPARK-10911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14993565#comment-14993565
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Jaromir Vanek commented on SPARK-10911:
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I also came across this problem. Is there anything that would spark against
explicit calling {{System.exit(0)}} in the
{{CoarseGrainedExecutorBackend#main}} method?
> Executors should System.exit on clean shutdown
> ----------------------------------------------
>
> Key: SPARK-10911
> URL: https://issues.apache.org/jira/browse/SPARK-10911
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.5.1
> Reporter: Thomas Graves
>
> Executors should call System.exit on clean shutdown to make sure all user
> threads exit and jvm shuts down.
> We ran into a case where an Executor was left around for days trying to
> shutdown because the user code was using a non-daemon thread pool and one of
> those threads wasn't exiting. We should force the jvm to go away with
> System.exit.
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