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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