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https://issues.apache.org/jira/browse/KAFKA-18919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai updated KAFKA-18919:
-----------------------------------
    Fix Version/s: 4.0.0

> 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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