Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3704#issuecomment-67051178
I buy your explanation, given the javadoc, so this LGTM. But I think a
cleaner approach that doesn't require reasoning like that to convince people
would be to just use a different temp dir per test (i.e. use `BeforeAndAfter`
and create the dir in the `before` block).
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