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https://issues.apache.org/jira/browse/KAFKA-18601?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismael Juma resolved KAFKA-18601.
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Resolution: Fixed
> Assume a baseline of 3.3 for server protocol versions
> -----------------------------------------------------
>
> Key: KAFKA-18601
> URL: https://issues.apache.org/jira/browse/KAFKA-18601
> Project: Kafka
> Issue Type: Improvement
> Reporter: Ismael Juma
> Assignee: Ismael Juma
> Priority: Blocker
> Fix For: 4.0.0
>
>
> 3.3.0 was the first KRaft release that was deemed production-ready and also
> when KIP-778 (KRaft to KRaft upgrades) landed. Given that, it's reasonable
> for 4.x to only support upgrades from 3.3.0 or newer (the metadata version
> also needs to be set to "3.3" or newer before upgrading).
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