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Posted to jira@kafka.apache.org by "Sean Quah (Jira)" <ji...@apache.org> on 2025/12/02 16:54:00 UTC

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

Sean Quah created KAFKA-19955:
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             Summary: 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
             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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