jerrypeng commented on issue #2692: Making emit, ack, and fail thread safe URL: https://github.com/apache/incubator-heron/pull/2692#issuecomment-390422873 @nlu90 just to be clear, with out this patch its not even possible to guarantee at-most once. An NPE will very likely to be thrown if you emit, ack, or fail from different threads
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