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Posted to dev@kafka.apache.org by "David Jacot (Jira)" <ji...@apache.org> on 2025/12/03 14:10:00 UTC

[jira] [Resolved] (KAFKA-19955) Performance regression in assignors

     [ https://issues.apache.org/jira/browse/KAFKA-19955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Jacot resolved KAFKA-19955.
---------------------------------
    Resolution: Fixed

> Performance regression in assignors
> -----------------------------------
>
>                 Key: KAFKA-19955
>                 URL: https://issues.apache.org/jira/browse/KAFKA-19955
>             Project: Kafka
>          Issue Type: Bug
>          Components: group-coordinator
>            Reporter: Sean Quah
>            Assignee: Sean Quah
>            Priority: Critical
>             Fix For: 4.2.0
>
>
> After [https://github.com/apache/kafka/pull/20097,] `MemberAssignmentImpl` wraps the new assignment in an immutable map. This prevents the server-side assignors from making incremental updates to assignments as they run and we end up doing repeated deep copies of assignments.



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