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https://issues.apache.org/jira/browse/KAFKA-19821?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai resolved KAFKA-19821.
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Fix Version/s: 4.2.0
Resolution: Fixed
> 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
> Priority: Major
> Fix For: 4.2.0
>
>
> 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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