Luke Chen created KAFKA-19821:
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             Summary: Duplicated batches should be logged
                 Key: KAFKA-19821
                 URL: https://issues.apache.org/jira/browse/KAFKA-19821
             Project: Kafka
          Issue Type: Improvement
            Reporter: Luke Chen
            Assignee: Kuan Po Tseng


When writing records with idempotent producer, the broker can help de-duplicate 
records. But when records being de-duplicated, there is no log in the broker 
side. This will confuse the producer because the records sent going to nowhere. 
Sometimes it's caused by the buggy producer that keeps using the wrong sequence 
number to cause the duplicated records. We should at least log the duplicated 
records info instead of pretending nothing happened.



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