Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/6457#issuecomment-141675764
> thread-safety: vanzin@ea62714
> This follows up on my "using AtomicInteger" comments. The
synchronization-based code had at least a couple of races in it; my changes
avoid using synchronization in Inbox and fix those races too.
Could you clarify the races? I post a comment about a race condition in
your commit.
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