Github user knusbaum commented on the pull request:
https://github.com/apache/storm/pull/1131#issuecomment-187366632
I don't think the blacklist is going to work in general since it is
possible in Storm to get multiple ack or fail messages for the same messageId.
I think it would be better to empty `emittedTuples` and `failedTuples` on
rebalance and determine if a message should be ignored based on its membership
in those maps.
Everything else looks pretty good besides normal cleanup.
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