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https://issues.apache.org/jira/browse/KAFKA-9600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17069978#comment-17069978
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ASF GitHub Bot commented on KAFKA-9600:
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hachikuji commented on pull request #8164: KAFKA-9600: EndTxn should enforce
strict epoch checking if from client
URL: https://github.com/apache/kafka/pull/8164
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> EndTxn handler should check strict epoch equality
> -------------------------------------------------
>
> Key: KAFKA-9600
> URL: https://issues.apache.org/jira/browse/KAFKA-9600
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Gustafson
> Assignee: Boyang Chen
> Priority: Major
>
> The EndTxn path in TransactionCoordinator is shared between direct calls to
> EndTxn from the client and internal transaction abort logic. To support the
> latter, the code is written to allow an epoch bump. However, if the client
> bumps the epoch unexpectedly (e.g. due to a buggy implementation), then the
> internal invariants are violated which results in a hanging transaction.
> Specifically, the transaction is left in a pending state because the epoch
> following append to the log does not match what we expect.
> To fix this, we should ensure that an EndTxn from the client checks for
> strict epoch equality.
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