jerrypeng commented on issue #2692: Making emit, ack, and fail thread safe URL: https://github.com/apache/incubator-heron/pull/2692#issuecomment-390730675 @nwangtw I agree that effectively-once semantics might not be honored if users decide process tuples asynchronously, but it is possible if the user uses the presave function as a trigger to create synchrony among user threads. I think it is matter of education and documentation to educate users on this, but I think this PR is good go.
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