Github user watermen commented on the pull request:
https://github.com/apache/spark/pull/1480#issuecomment-50426714
@mateiz Without this, the DiskStore's shutdown hook is only called when
spark on Standalone Mode. When running spark over Mesos in âfine-grainedâ
modes or âcoarse-grainedâ mode. After executor exist, The local
dir(/tmp/spark-local-20140718114058-834c) is still exist.
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