[jira] [Resolved] (KAFKA-10027) Implement read path for feature versioning scheme

["Jun Rao (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-10027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jun Rao resolved KAFKA-10027.
-----------------------------
    Fix Version/s: 2.7.0
         Assignee: Kowshik Prakasam
       Resolution: Fixed

merged the PR to trunk

> Implement read path for feature versioning scheme
> -------------------------------------------------
>
>                 Key: KAFKA-10027
>                 URL: https://issues.apache.org/jira/browse/KAFKA-10027
>             Project: Kafka
>          Issue Type: Sub-task
>            Reporter: Kowshik Prakasam
>            Assignee: Kowshik Prakasam
>            Priority: Major
>             Fix For: 2.7.0
>
>
> Goal is to implement various classes and integration for the read path of the feature versioning system ([KIP-584|https://cwiki.apache.org/confluence/display/KAFKA/KIP-584%3A+Versioning+scheme+for+features]). The ultimate plan is that the cluster-wide *finalized* features information is going to be stored in ZK under the node {{/feature}}. The read path implemented in this PR is centered around reading this *finalized* features information from ZK, and, processing it inside the Broker.
>  
> Here is a summary of what's needed for this Jira (a lot of it is *new* classes):
>  * A facility is provided in the broker to declare it's supported features, and advertise it's supported features via it's own {{BrokerIdZNode}} under a {{features}} key.
>  * A facility is provided in the broker to listen to and propagate cluster-wide *finalized* feature changes from ZK.
>  * When new *finalized* features are read from ZK, feature incompatibilities are detected by comparing against the broker's own supported features.
>  * {{ApiVersionsResponse}} is now served containing supported and finalized feature information (using the newly added tagged fields).



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