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https://issues.apache.org/jira/browse/KAFKA-15441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Arthur resolved KAFKA-15441.
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Resolution: Fixed
> Broker sessions can time out during ZK migration
> ------------------------------------------------
>
> Key: KAFKA-15441
> URL: https://issues.apache.org/jira/browse/KAFKA-15441
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 3.6.0
> Reporter: David Arthur
> Assignee: David Arthur
> Priority: Blocker
> Fix For: 3.6.0
>
>
> When a ZK to KRaft migration takes more than a few seconds to complete, the
> sessions between the ZK brokers and the KRaft controller will expire. This
> appears to be due to the heartbeat events being blocked in the purgatory on
> the controller.
> The side effect of this expiration is that after the metadata is migrated,
> the KRaft controller will immediately fence all of the brokers and remove
> them from ISRs. This leads to a mass leadership change that can cause large
> latency spikes on the brokers.
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