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https://issues.apache.org/jira/browse/KAFKA-18919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17932685#comment-17932685
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Ismael Juma commented on KAFKA-18919:
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Perhaps. I think it would be a good idea to have a KIP where we can make sure
we are not missing any important details. If we agree that the compatibility
risk is indeed acceptable for a feature release, we can perhaps do it in 4.1.
> Clarify that KafkaPrincipalBuilder classes must also implement
> KafkaPrincipalSerde
> ----------------------------------------------------------------------------------
>
> Key: KAFKA-18919
> URL: https://issues.apache.org/jira/browse/KAFKA-18919
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Mickael Maison
> Assignee: Szu-Yung Wang
> Priority: Major
> Fix For: 4.0.0
>
>
> In KRaft, custom KafkaPrincipalBuilder implementations must also implement
> KafkaPrincipalSerde, otherwise brokers are not able to forward requests to
> the controller.
> So we need to update our docs.
> -We should also be able to do some cleanup in the code. For example
> RequestContext uses Optional<KafkaPrincipalSerde>, we should be able to
> remove Optional since it's now always present.- moved to KAFKA-18922
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