[jira] [Created] (KAFKA-867) producer transaction issue when metrics lib not correct

["Ian Roughley (JIRA)" <ji...@apache.org>]

Ian Roughley created KAFKA-867:
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             Summary: producer transaction issue when metrics lib not correct
                 Key: KAFKA-867
                 URL: https://issues.apache.org/jira/browse/KAFKA-867
             Project: Kafka
          Issue Type: Bug
            Reporter: Ian Roughley


When building a producer, I used a different version of metrics (v2.2.0).  What I found in this case was that I could deploy a producer, however the consumer received 4 copies of each message I sent.

Further investigation let to:
- the timer start method was found in the producer code
- the message was sent to the broker
- the timer method was not found in the producer code, causing an exception to be thrown
- the exception caused a retry (3 times)
- as the message was already at the broker, there was no rollback

Not sure if this warrant a higher level of handshaking with the broker.  But it is a fairly simple issue to cause (given kafka's currently buit with a non-published metrics version), that may cause miss-understanding.

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