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https://issues.apache.org/jira/browse/KAFKA-14656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Arthur resolved KAFKA-14656.
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Resolution: Fixed
> Brokers rejecting LISR during ZK migration
> ------------------------------------------
>
> Key: KAFKA-14656
> URL: https://issues.apache.org/jira/browse/KAFKA-14656
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 3.4.0
> Reporter: David Arthur
> Assignee: David Arthur
> Priority: Blocker
> Fix For: 3.4.0
>
>
> During the ZK migration, the KRaft controller sends controller RPCs to the ZK
> brokers (LISR, UMR, etc). Since the migration can begin immediately after a
> ZK broker starts up with migration enabled, it is possible that this broker
> is not seen as alive by the rest of the brokers. This is due to the KRaft
> controller taking over before the ZK controller can send out UMR with the
> restarted broker.
>
> The result is that the parts of the LISR sent by KRaft immediately after the
> metadata migration is rejected by brokers due the leader being offline.
>
> The fix for this is to send an UMR to all brokers after the migration with
> the set of alive brokers.
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