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https://issues.apache.org/jira/browse/KAFKA-7481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dong Lin resolved KAFKA-7481.
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    Resolution: Fixed

> 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
>            Assignee: 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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