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 or even if you emit, ack, or fail from the same thread but not the bolt/spout instance thread you will run into trouble
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