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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