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https://issues.apache.org/jira/browse/KAFKA-13165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17393486#comment-17393486
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Jose Armando Garcia Sancio commented on KAFKA-13165:
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We discussed this offline. We decided to have controller and brokers share the
same id space. In other works it is expected that the id of a controller only
node doesn't conflict with the id of a broker only node.
I am going to make the validation describe in this Jira a blocker of 3.0.
> Validate node id, process role and quorum voters
> ------------------------------------------------
>
> Key: KAFKA-13165
> URL: https://issues.apache.org/jira/browse/KAFKA-13165
> Project: Kafka
> Issue Type: Sub-task
> Components: kraft
> Reporter: Jose Armando Garcia Sancio
> Priority: Major
>
> Under certain configuration is possible for the Kafka Server to boot up as a
> broker only but be the cluster metadata quorum leader. We should validate the
> configuration to avoid this case.
> # If the {{process.roles}} contains {{controller}} then the {{node.id}}
> needs to be in the {{controller.quorum.voters}}
> # If the {{process.roles}} doesn't contain {{controller}} then the
> {{node.id}} cannot be in the {{controller.quorum.voters}}
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