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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