Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3705#issuecomment-67915900
(lack of) thread-safety issues aside, this PR looks good to me. It makes
sense to have application-specific directories now that we have state that tied
to an application's lifecycle (lock files, file caches, etc) rather than
individual executors' lifecycles.
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