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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