Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/6409#issuecomment-105947945
> Really yarn needs a cleanup task that runs after the application master
is killed but that isn't supported at this point.
Yeah, that's too bad; in Spark we could have a best effort by adding some
code to the launcher, to check if any clean up is needed after the app
finishes. Not guaranteed since the launcher can go away, but still...
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