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https://issues.apache.org/jira/browse/KAFKA-18477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17931679#comment-17931679
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Ismael Juma commented on KAFKA-18477:
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It's unlikely that any topic would only have V0/V1 records since any writes
with IBP >= 3.0 would result in a V2 record being written. And direct upgrades
to 4.0 have to be done from 3.3. It is possible for compacted topics to have
some V0/V1 records though.
> remove usage of OffsetForLeaderEpochRequest in AbstractFetcherThread
> --------------------------------------------------------------------
>
> Key: KAFKA-18477
> URL: https://issues.apache.org/jira/browse/KAFKA-18477
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 4.0.0
> Reporter: Jun Rao
> Assignee: 黃竣陽
> Priority: Major
> Fix For: 4.1.0
>
>
> This is because of the base MV in 4.0 is 3.0.
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