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https://issues.apache.org/jira/browse/KAFKA-19021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18046305#comment-18046305
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Christo Lolov commented on KAFKA-19021:
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Moving to 4.3 since we are past the code freeze for 4.2! Let me know if I have
misunderstood something!
> Broker should not be allowed to be promoted to controller
> ---------------------------------------------------------
>
> Key: KAFKA-19021
> URL: https://issues.apache.org/jira/browse/KAFKA-19021
> Project: Kafka
> Issue Type: Sub-task
> Components: kraft
> Reporter: José Armando García Sancio
> Assignee: José Armando García Sancio
> Priority: Major
> Fix For: 4.2.0
>
>
> It is possible for the user to add broker as a controller by using
> "kafka-metadata-quorum add-controller". This can be fixed by having the
> controller check the set of RPC exposed in the ApiVersion response.
> The leader already makes a call to ApiVersion to check the kraft.version of
> the new controller. The leader should extend this check to make sure that the
> node also supports all of the KRaft RPCs. That includes Vote, FetchSnapshot,
> BeginQuorum, EndQuorum, etc.
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