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https://issues.apache.org/jira/browse/KAFKA-18477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17931623#comment-17931623
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Chia-Ping Tsai commented on KAFKA-18477:
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{quote}
since we only have V2 message format in 4.0. So, we only need to transition to
the Fetching state and not the Truncating state. OffsetsForLeaderEpochRequest
is only needed in the Truncating state.
{quote}
[~junrao] Excuse me, since 4.0 can still "read" v0/v1 messages, can it fetch a
replica containing only v0/v1 messages? For example, a topic has existed for a
long time and users haven't performed compaction or retention. One day, users
want to create more replicas for it.
> 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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