Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/8843#issuecomment-141857434
I think for most the places, Spark application shutdown hook will finally
delete all temp files when application is exited, so temporary not deleted
files will finally be cleaned. Besides, if this file is not deleted due to FS
problem, it is better to throw out an exception to notify user.
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