Github user HeartSaVioR commented on the issue:
https://github.com/apache/storm/pull/1919
Case 3 is normally what we think about non-ack in Storm spout, and it's not
same as case 1 since it can guarantee at most once.
So one way to keep our delivery guarantee is forcing autocommit to true
(not selectable from user), which I'm not sure we're all satisfied. What do you
think?
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