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https://issues.apache.org/jira/browse/KAFKA-13245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan Dielhenn updated KAFKA-13245:
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Description:
Pre-Kraft brokers expose 0 for controller metrics in the case of controller
failover. KRaft brokers should not since they will never be elected as
controller and since this would introduce a non-negligible performance impact.
If a KRaft node is a "controller" process but is not the active controller it
will expose 0 for all controller metrics since the process is eligible to
become the active controller. This is consistent with behavior for
controller-eligible nodes in a Kafka cluster using Zookeeper.
https://cwiki.apache.org/confluence/display/KAFKA/KIP+771%3A+KRaft+brokers+should+not+expose+controller+metrics
was:Zookeeper brokers expose 0 for controller metrics in the case of
controller failover. KRaft brokers should not since they will never be elected
as controller and since this would introduce a non-negligible performance
impact.
> KIP 771: Change behavior of how controller metrics are exposed when using
> KRaft.
> --------------------------------------------------------------------------------
>
> Key: KAFKA-13245
> URL: https://issues.apache.org/jira/browse/KAFKA-13245
> Project: Kafka
> Issue Type: Improvement
> Reporter: Ryan Dielhenn
> Assignee: Ryan Dielhenn
> Priority: Major
>
> Pre-Kraft brokers expose 0 for controller metrics in the case of controller
> failover. KRaft brokers should not since they will never be elected as
> controller and since this would introduce a non-negligible performance
> impact. If a KRaft node is a "controller" process but is not the active
> controller it will expose 0 for all controller metrics since the process is
> eligible to become the active controller. This is consistent with behavior
> for controller-eligible nodes in a Kafka cluster using Zookeeper.
>
> https://cwiki.apache.org/confluence/display/KAFKA/KIP+771%3A+KRaft+brokers+should+not+expose+controller+metrics
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