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https://issues.apache.org/jira/browse/KAFKA-5542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16069126#comment-16069126
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Jun Rao commented on KAFKA-5542:
--------------------------------
We can clarify the following.
"During the upgrade phase when some existing messages may not have a leader
epoch, if requestedEpoch is < the first epoch in epochs, we want to return
UNSUPPORTED_EPOCH_OFFSET so that the follower can fall back to HW."
> Improve Java doc for LeaderEpochFileCache.endOffsetFor()
> --------------------------------------------------------
>
> Key: KAFKA-5542
> URL: https://issues.apache.org/jira/browse/KAFKA-5542
> Project: Kafka
> Issue Type: Improvement
> Reporter: Dong Lin
> Assignee: Ben Stopford
>
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