Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/6674#issuecomment-109437181
The root problem was that the tmp directory was not created (I added code
to both builds to explicitly do it). I guess depending on which tests run first
the directory might be there (some tests use guava's
`Files.createTempDirectory`, maybe that one creates the dir if it isn't there).
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