Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/11109#issuecomment-196519602
OK it turns out the exit code is not 0, but it is really confusing because
the last message simply says "build succeeded, 31 warnings.
Build finished. The HTML pages are in _build/html."
while the pep8 failures are way above the last messages.
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