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