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https://issues.apache.org/jira/browse/KAFKA-7959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775669#comment-16775669
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ASF GitHub Bot commented on KAFKA-7959:
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hachikuji commented on pull request #6298: KAFKA-7959: Delete leader epoch
cache files with old message format versions
URL: https://github.com/apache/kafka/pull/6298
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> Clear/delete epoch cache if old message format is in use
> --------------------------------------------------------
>
> Key: KAFKA-7959
> URL: https://issues.apache.org/jira/browse/KAFKA-7959
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Gustafson
> Assignee: Stanislav Kozlovski
> Priority: Major
>
> Because of KAFKA-7897, it is possible to have a sparse epoch cache when using
> the old message format. The fix for that issue addresses the problem of
> improper use of that cache while the message format remains on an older
> version. However, it leaves the possibility of misuse during a message format
> upgrade, which can cause unexpected truncation and re-replication. To fix the
> problem, we should delete or at least clear the cache whenever the old
> message format is used.
> Note that this problem was fixed unintentionally in 2.1 with the patch for
> KAFKA-7897. This issue applies specifically to the 2.0 branch.
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