Github user WangTaoTheTonic commented on the pull request:
https://github.com/apache/spark/pull/3942#issuecomment-69304668
@tgravescs
I've tested it on my cluster with `yarn.resourcemanager.am.max-attempts=2`
and set `spark.yarn.maxAppAttempts` to 1,2,3.
Before this patch, with `spark.yarn.maxAppAttempts=3`, the stage directory
was not deleted, which means unregister has not happend.
After this patch, in all cases the stage directory was deleted.
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