Github user Sephiroth-Lin commented on the pull request: https://github.com/apache/spark/pull/4620#issuecomment-75919413 @srowen as PR #4747 will cache the local root directories, then we can close this PR first. For PR #4747 I think we also need to remove the local root directories after application is exited or SparkContext is stoped, or else also will create too many empty directories.
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