Github user squito commented on the pull request:
https://github.com/apache/spark/pull/9610#issuecomment-156244415
you can take this test case if you like:
https://github.com/squito/spark/blob/SPARK-8029_first_wins/core/src/test/scala/org/apache/spark/ShuffleSuite.scala#L351
I'd also add more test cases to cover the various paths through the output
commit code. And I think that `ShuffleWriter.write` should at least include a
comment explaining the need for shuffle writers to write to a tmp file and
atomically move them to the final place, since its not obvious why that would
be necessary, and I guess there isn't any other good place to stick the
explanation.
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