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https://issues.apache.org/jira/browse/KAFKA-15109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Arthur resolved KAFKA-15109.
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Resolution: Fixed
> ISR shrink/expand issues on ZK brokers during migration
> -------------------------------------------------------
>
> Key: KAFKA-15109
> URL: https://issues.apache.org/jira/browse/KAFKA-15109
> Project: Kafka
> Issue Type: Bug
> Components: kraft, replication
> Affects Versions: 3.6.0
> Reporter: David Arthur
> Assignee: David Arthur
> Priority: Critical
> Fix For: 3.6.0
>
>
> KAFKA-15021 introduced a new controller behavior that avoids increasing the
> leader epoch during the controlled shutdown scenario. This prevents some
> unnecessary thrashing of metadata and threads on the brokers and clients.
> While a cluster is in a KIP-866 migration and has a KRaft controller with ZK
> brokers, we cannot employ this leader epoch bump avoidance. The ZK brokers
> must have the leader epoch bump in order for ReplicaManager to react to the
> LeaderAndIsrRequest.
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