Github user vanzin commented on the pull request: https://github.com/apache/spark/pull/4509#issuecomment-74139464 That's ok because the temp dir would be created underneath one of the "root local dirs" created by the `getOrCreateLocalRootDirs` method here: https://github.com/apache/spark/pull/4509/files#diff-d239aee594001f8391676e1047a0381eR698 So the top-most directory would have the right permissions (700 in the usual case, or whatever permissions Yarn sets when talking about Yarn containers). That's enough to prevent access to the underlying tree.
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