Github user james-sirota commented on the issue:
https://github.com/apache/incubator-metron/pull/143
If a message or a tuple fails validation then the associated message should
get routed to a dead letter queue. I believe there is a different PR that is
required to get the dead letter queue established. The tuple should be acked,
though. We need to differentiate between if the tuple is failed due to not
being able to be parsed vs. not validated. So if we fail based on parser
issues then we need to ack for validation issues and then land the message in
the dead letter queue. The important thing is for the messages that fail
validation not to go through the rest of the pipeline.
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