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https://issues.apache.org/jira/browse/KAFKA-12886?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin McCabe resolved KAFKA-12886.
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Resolution: Won't Fix
At this point we won't be changing the behavior of ZK mode. Closing as "Won't
Fix"
> Enable request forwarding by default
> ------------------------------------
>
> Key: KAFKA-12886
> URL: https://issues.apache.org/jira/browse/KAFKA-12886
> Project: Kafka
> Issue Type: Improvement
> Reporter: Jason Gustafson
> Priority: Blocker
>
> KIP-590 documents that request forwarding will be enabled in 3.0 by default:
> https://cwiki.apache.org/confluence/display/KAFKA/KIP-590%3A+Redirect+Zookeeper+Mutation+Protocols+to+The+Controller.
> This makes it a requirement for users with custom principal implementations
> to provide a `KafkaPrincipalSerde` implementation. We waited until 3.0
> because we saw this as a compatibility break.
> The KIP documents that use of forwarding will be controlled by the IBP. So
> once the IBP has been configured to 3.0 or above, then the brokers will begin
> forwarding.
> (Note that forwarding has always been a requirement for kraft.)
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