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Posted to dev@kafka.apache.org by "José Armando García Sancio (Jira)" <ji...@apache.org> on 2025/06/17 19:12:00 UTC

[jira] [Resolved] (KAFKA-18751) Complete delayed FETCH request when HWM is increased.

     [ https://issues.apache.org/jira/browse/KAFKA-18751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

José Armando García Sancio resolved KAFKA-18751.
------------------------------------------------
    Resolution: Fixed

> Complete delayed FETCH request when HWM is increased.
> -----------------------------------------------------
>
>                 Key: KAFKA-18751
>                 URL: https://issues.apache.org/jira/browse/KAFKA-18751
>             Project: Kafka
>          Issue Type: Improvement
>          Components: kraft
>            Reporter: José Armando García Sancio
>            Assignee: José Armando García Sancio
>            Priority: Major
>             Fix For: 4.1.0
>
>
> It is possible for HWM propagation to get delayed if the the HWM is increased and there are no new data in the log.
> One solution to this problem is for the leader to track the last HWM sent to the replicas and immediately reply to FETCH request if the HWM is greater than the previously sent HWM.
>  
> One issue with this solution is that the leader doesn't have a reliable way of determining that an empty FETCH response made it to the remote replica. This can be address if the FETCH request also include the remotes replica HWM.
>  
>  



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