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https://issues.apache.org/jira/browse/KAFKA-18464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justine Olshan resolved KAFKA-18464.
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Resolution: Fixed
> Empty Abort Transaction can fence producer incorrectly with Transactions V2
> ---------------------------------------------------------------------------
>
> Key: KAFKA-18464
> URL: https://issues.apache.org/jira/browse/KAFKA-18464
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 4.0.0
> Reporter: Justine Olshan
> Assignee: Justine Olshan
> Priority: Blocker
> Fix For: 4.0.0
>
>
> Consider the following scenario using transactions V2.
> Producer writes a transaction and commits.
> Producer starts the next transaction and tries to add a partition but gets an
> non-retriable error. Because the application doesn't know whether the
> partition was added/records written the producer aborts. In the case where
> the partition was not added, and the previous transaction was still in
> PrepareCommit state, we self-fence.
> This is because the epoch of the current state == incoming request epoch and
> the PrepareCommit state currently only allows for retries where the request
> epoch is -1 the current epoch.
> Instead of hitting this, we should just return the concurrent transactions
> error when we have pending state and do the epoch check second. In this
> scenario, we will complete commit before proceeding to the empty abort.
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