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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