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https://issues.apache.org/jira/browse/KAFKA-14552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismael Juma resolved KAFKA-14552.
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Resolution: Fixed
> Assume a baseline of 3.0 for server protocol versions
> -----------------------------------------------------
>
> Key: KAFKA-14552
> URL: https://issues.apache.org/jira/browse/KAFKA-14552
> Project: Kafka
> Issue Type: Improvement
> Reporter: Ismael Juma
> Assignee: Ismael Juma
> Priority: Blocker
> Fix For: 4.0.0
>
>
> Kafka 4.0 will remove support for zk mode and will require conversion to
> kraft before upgrading to 4.0. The minimum kraft version is 3.0 (aka 3.0-IV1).
> This provides an opportunity to remove exclusively server side protocols
> versions that only exist to allow direct upgrades from versions older than
> 3.0 or that are used only by zk mode.
> Since KRaft became production ready in 3.3, we should consider setting the
> baseline to 3.3. But that requires more discussion and it can be done via a
> separate change (KAFKA-18601).
> Protocol changes:
> * Remove RequestHeader v0 (only used by ControlledShutdown v0)
> * Remove WriteTxnMarkers v0
> * Remove all versions of ControlledShutdown, LeaderAndIsr, StopReplica,
> UpdateMetadata
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