Github user cestella commented on the issue:
https://github.com/apache/incubator-metron/pull/359
How does this result in duplicate data? Either the message completes a
join and it isn't failed or it does not complete the join, does not pass past
the join bolt and is replayed from the last anchor (which I think is the split
bolt).
The rationale for not acking there is to have the message replay under
circumstances where one of the enrichments is experiencing transient failure.
A failure in the join would result in a replay of the message and a retry.
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