Github user XuMingmin commented on the issue:
https://github.com/apache/storm/pull/1919
@HeartSaVioR instinctively I think your code can meet at-most-once.
Records that are pulled and not yet emitted are discarded if any crash.
Still, I'd want to limit the scope of this task, to close it first to fix
case 1, and have a new task(STORM-2357) to figure out what's the proper
solution to achieve exactly at-most-once.
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