nwangtw commented on issue #2692: Making emit, ack, and fail thread safe URL: https://github.com/apache/incubator-heron/pull/2692#issuecomment-390711888 I think maosong's concern is still valid. For stateful process, we have to make sure the checkpoint are made after all user threads have done their acks. Which is why Neng said above "But I think we need to mention the thread-safe acking to users very carefully, ensures them that EFFECTLY-ONCE might be broken if they don't implement preSave carefully."
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