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https://issues.apache.org/jira/browse/KAFKA-13896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17544451#comment-17544451
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David Arthur commented on KAFKA-13896:
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[~Jack-Lee] yes when we're doing a downgrade we use the metadata.version in the
UpdateFeatures RPC (when the upgrade type is set to DOWNGRADE or
UNSAFE_DOWNGRADE)
> Support unsafe downgrades in KRaft
> ----------------------------------
>
> Key: KAFKA-13896
> URL: https://issues.apache.org/jira/browse/KAFKA-13896
> Project: Kafka
> Issue Type: Sub-task
> Components: controller, kraft
> Reporter: David Arthur
> Priority: Minor
>
> In order to support the "unsafe" downgrade specified in KIP-778 we need to be
> able to generate a downgraded snapshot on the broker and controller. This
> snapshot will write out metadata records at the record level that matches the
> target metadata.version. Records that were added after the target
> metadata.version will be omitted from the snapshot.
> This also means we need a way to correlate record versions with
> metadata.version.
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