Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/2803#issuecomment-59458952
@pwendell I'm not pretty sure about that... This PR fixes the race
condition, but the first Jenkins build of this PR also suffered the
`spark.local.dir` clean up failure issue, which doesn't happen
deterministically. It seems that the temporary directories under `/tmp` got
corrupted. Maybe it's related to Jenkins environment. I observed this kind of
failure pretty frequently last night (e.g. [build
21797](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/21797/console)),
but now it's gone. Let's wait and see whether it happens again.
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