Github user squito commented on the issue: https://github.com/apache/spark/pull/19145 I'm not sure I totally follow the sequence of events, but I get the feeling this should be handled in yarn, not spark. Also, I agree with Jerry, it seems like your `completedContainerIdSet` may grow continuously. You'll remove from it *if* you happen to get a duplicate message. But I think in most cases you will not a get duplicate message, if I understand correctly.
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