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https://issues.apache.org/jira/browse/KAFKA-19228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Wu updated KAFKA-19228:
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    Summary: `kafka-storage format` should not support explicitly setting 
kraft.version feature level  (was: Formatting with `--no-initial-controllers` 
flag should not write kraft version control record)

> `kafka-storage format` should not support explicitly setting kraft.version 
> feature level
> ----------------------------------------------------------------------------------------
>
>                 Key: KAFKA-19228
>                 URL: https://issues.apache.org/jira/browse/KAFKA-19228
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Kevin Wu
>            Assignee: Kevin Wu
>            Priority: Major
>
> The current implementation of this flag will write kraft version 1 to the 
> `bootstrap.checkpoint` file. However, this is not exactly correct. KRaft 
> version 1 means the voter set is discoverable from the log, but here we have 
> KRaft version 1 but no voter set yet on this node.
> The intention of setting this flag is to indicate the cluster is bootstrapped 
> with a voter set, and therefore should essentially be a no-op (i.e. it should 
> not write this version record anywhere). It sort of behaves like this, since 
> we do not write a dynamic quorum snapshot unlike when setting `–standalone` 
> or `--initial-controllers`.
>  
> This is important because this means a cluster with kraft version 0 that 
> discovers the voter set via the `controller.quorum.voters` static config can 
> also be formatted with this flag set without throwing an error.



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