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https://issues.apache.org/jira/browse/KAFKA-7481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16657754#comment-16657754
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Dong Lin commented on KAFKA-7481:
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[~hachikuji] Thanks for the quick work on the KIP! The KIP looks good overall.
I may have some question about how to make it easier for user to understand the
use of inter.broker.protocol.version, message.format.version and
persistent.metadata.version and document it in both Kafka wiki and the KIP.
This can be discussed in more detail in the KIP discussion thread. Overall I
think this KIP is the right long term solution for the problem.
I am inclined not to block the 2.1 release on this KIP given that it is an
existing issue that has affected previous release. But I am open to the other
choice if other committers prefer that.
> Consider options for safer upgrade of offset commit value schema
> ----------------------------------------------------------------
>
> Key: KAFKA-7481
> URL: https://issues.apache.org/jira/browse/KAFKA-7481
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Gustafson
> Priority: Blocker
> Fix For: 2.1.0
>
>
> KIP-211 and KIP-320 add new versions of the offset commit value schema. The
> use of the new schema version is controlled by the
> `inter.broker.protocol.version` configuration. Once the new inter-broker
> version is in use, it is not possible to downgrade since the older brokers
> will not be able to parse the new schema.
> The options at the moment are the following:
> 1. Do nothing. Users can try the new version and keep
> `inter.broker.protocol.version` locked to the old release. Downgrade will
> still be possible, but users will not be able to test new capabilities which
> depend on inter-broker protocol changes.
> 2. Instead of using `inter.broker.protocol.version`, we could use
> `message.format.version`. This would basically extend the use of this config
> to apply to all persistent formats. The advantage is that it allows users to
> upgrade the broker and begin using the new inter-broker protocol while still
> allowing downgrade. But features which depend on the persistent format could
> not be tested.
> Any other options?
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