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https://issues.apache.org/jira/browse/KAFKA-18042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justine Olshan resolved KAFKA-18042.
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Fix Version/s: 4.1.0
Resolution: Fixed
> Reject the produce request with lower producer epoch early.
> -----------------------------------------------------------
>
> Key: KAFKA-18042
> URL: https://issues.apache.org/jira/browse/KAFKA-18042
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Calvin Liu
> Assignee: Ritika Reddy
> Priority: Minor
> Fix For: 4.1.0
>
>
> With the transaction V2, replica manager checks whether the incoming producer
> request produces to a partition belonging to a transaction. ReplicaManager
> figures this out by checking the producer epoch stored in the partition log.
> However, the current code does not reject the produce request if its producer
> epoch is lower than the stored producer epoch. It is an optimization to
> reject such requests earlier instead of sending an AddPartitionToTxn request
> and getting rejected in the response.
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