Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/6026#issuecomment-101360802
> But, what if the last app attempt fails before ApplicationMaster starts
and after submitApplication returns successfully.
That requires the launcher to still be around to be fixed, which is not
guaranteed (use can just ctrl-c out of the launcher, it's not required after
the app starts).
If the launcher is still around, though, it can probably just do a final
check for the presence of the staging dir after the app finishes, regardless of
final status.
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