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https://issues.apache.org/jira/browse/KAFKA-14145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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José Armando García Sancio resolved KAFKA-14145.
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Resolution: Fixed
> Faster propagation of high-watermark in KRaft topic partitions
> --------------------------------------------------------------
>
> Key: KAFKA-14145
> URL: https://issues.apache.org/jira/browse/KAFKA-14145
> Project: Kafka
> Issue Type: Sub-task
> Components: kraft
> Reporter: Jose Armando Garcia Sancio
> Assignee: José Armando García Sancio
> Priority: Critical
> Fix For: 4.1.0
>
>
> Typically, the HWM is increase after one round of Fetch requests from the
> majority of the replicas. The HWM is propagated after another round of Fetch
> requests. If the LEO doesn't change the propagation of the HWM can be delay
> by one Fetch wait timeout (500ms).
> Looking at the KafkaRaftClient implementation we would have to have an index
> for both the fetch offset and the last sent high-watermark for that replica.
> Another issue here is that we changed the KafkaRaftManager so that it doesn't
> set the replica id when it is an observer/broker. Since the HWM is not part
> of the Fetch request the leader would have to keep track of this in the
> LeaderState.
> {code:java}
> val nodeId = if (config.processRoles.contains(ControllerRole)) {
> OptionalInt.of(config.nodeId)
> } else {
> OptionalInt.empty()
> } {code}
> We would need to find a better solution for
> https://issues.apache.org/jira/browse/KAFKA-13168 or improve the FETCH
> request so that it includes the HWM.
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