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https://issues.apache.org/jira/browse/KAFKA-18660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justine Olshan resolved KAFKA-18660.
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Resolution: Fixed
> Transactions Version 2 doesn't handle epoch overflow correctly
> --------------------------------------------------------------
>
> Key: KAFKA-18660
> URL: https://issues.apache.org/jira/browse/KAFKA-18660
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 4.0.0
> Reporter: Justine Olshan
> Assignee: Justine Olshan
> Priority: Blocker
>
> We should be returning the new epoch and producer ID to the client so we
> should be using newPreSendMetadata here.
> [https://github.com/apache/kafka/blob/f18457f2b8f7adc5fb8ea2c46dcf38973aaf4667/core/src/main/scala/kafka/coordinator/transaction/TransactionCoordinator.scala#L943]
> However, when testing this change I found some of the old producer id + epoch
> causing issues – likely because we haven't transitioned to the new metadata
> (ie concurrent transactions issue), so we will need to handle that as well.
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