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https://issues.apache.org/jira/browse/KAFKA-7567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-7567.
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       Resolution: Fixed
    Fix Version/s: 2.2.0

> Clean up internal metadata usage for consistency and extensibility
> ------------------------------------------------------------------
>
>                 Key: KAFKA-7567
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7567
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Jason Gustafson
>            Assignee: Jason Gustafson
>            Priority: Major
>             Fix For: 2.2.0
>
>
> This refactor has two objectives to improve metadata handling logic and 
> testing:
> 1. We want to reduce dependence on the public object `Cluster` for internal 
> metadata propagation since it is not easy to evolve. As an example, we need 
> to propagate leader epochs from the metadata response to `Metadata`, but it 
> is not straightforward to do this without exposing it in `PartitionInfo` 
> since that is what `Cluster` uses internally. By doing this change, we are 
> able to remove some redundant `Cluster` building logic. 
> 2. We want to make the metadata handling in `MockClient` simpler and more 
> consistent. Currently we have mix of metadata update mechanisms which are 
> internally inconsistent with each other and also do not match the 
> implementation in `NetworkClient`.



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