Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4066#issuecomment-73802711
After over 400 runs, I haven't seen any missing output so I think it's safe
to say that this fixed the bug. I did notice that speculative tasks sometimes
fail with exceptions after the job finishes, but they fail in the
`SparkHadoopWriter.open()` call because the `_temporary` directory has already
been deleted. This is some annoying log noise, but it shouldn't impact
correctness. These spurious task failures won't cause the job to fail because
they only occur after the job has committed.
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