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https://issues.apache.org/jira/browse/KAFKA-17094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17864980#comment-17864980
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Igor Soarez commented on KAFKA-17094:
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I agree it makes sense to make this information available through RPCs, but the
{{Quorum}} is probably not the right place to represent registered (but
inactive) brokers – Quorum represents only the Raft-like part of the cluster. I
think it would make more sense to add a new field to
{{{}DescribeClusterResponse{}}}. I guess {{handleDescribeCluster}} filters out
inactive brokers to preserve the ZK-mode behavior.
> Make it possible to list registered KRaft nodes in order to know which nodes
> should be unregistered
> ---------------------------------------------------------------------------------------------------
>
> Key: KAFKA-17094
> URL: https://issues.apache.org/jira/browse/KAFKA-17094
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 3.7.1
> Reporter: Jakub Scholz
> Priority: Major
>
> Kafka seems to require nodes that are removed from the cluster to be
> unregistered using the Kafka Admin API. If they are unregistred, that you
> might run into problems later. For example, after upgrade when you try to
> bump the KRaft metadata version, you might get an error like this:
>
> {code:java}
> g.apache.kafka.common.errors.InvalidUpdateVersionException: Invalid update
> version 19 for feature metadata.version. Broker 3002 only supports versions
> 1-14 {code}
> In this case, 3002 is an old node that was removed before the upgrade and
> doesn't support the KRaft metadata version 19 and blocks the metadata update.
>
> However, it seems to be impossible to list the registered nodes in order to
> unregister them:
> * The describe cluster metadata request in the Admin API seems to return
> only the IDs of running brokers
> * The describe metadata quorum command seems to list the removed nodes in
> the list of observers. But it does so only until the controller nodes are
> restarted.
> If Kafka expects the inactive nodes to be registered, it should provide a
> list of the registered nodes so that it can be checked what nodes to
> unregister.
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