Github user growse commented on the pull request:
https://github.com/apache/spark/pull/4509#issuecomment-74177629
Is it a bad principle that code that needs to create local, secure storage
should explicitly call chmod700? So in the case of `SparkIMain.scala`, if the
directory does need to have its permissions changed, that should be done in
`outputDir` rather than in `createTempDir`?
To me, it would seem surprising to call `createTempDir` and find that the
method not only creates directories but also sets permissions. Maybe
`createPrivateTempDir` would be a better method name in that case.
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