Github user vanzin commented on the pull request: https://github.com/apache/spark/pull/4509#issuecomment-74178191 > So in the case of SparkIMain.scala, if the directory does need to have its permissions changed, that should be done in SparkIMain itself rather than in createTempDir? `SparkIMain` should create its directory under the directory returned by `getLocalDir()`. `getLocalDir()` has specific semantics: it's an app-specific directory, placed in a location defined by the cluster manager (or the user in case of the driver in cluster mode), and is properly protected. (`createTempDir` has an argument to define the parent directory where to create the temp dir.)
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