Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6323#issuecomment-104725423
Actually, one minor comment: `ser` currently has wider visibility than is
strictly necessary: it's only used inside of the `DriverEndpoint` inner class,
so it should be a field of that class rather than a field of
`CoarseGrainedSchedulerBackend`.
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