Github user Sephiroth-Lin commented on the pull request: https://github.com/apache/spark/pull/4620#issuecomment-74860104 @srowen as in function "getOrCreateLocalRootDirs" will create a subdirectory for root local dir, then if we call "getLocalDir" will create a subdirectory for root local dir. who call getOrCreateLocalRootDirs directly. In current master branch, when we create tmp dir will call getLocaalDir first, so it will create nested directories. And in standalone mode, will create tmp dir first when lunch executor, so total it will create 4 levels directories, in other mode it will create 2 levels directories for all tmp dir.
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