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https://issues.apache.org/jira/browse/KAFKA-21196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18121768#comment-18121768
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sanghyeok An commented on KAFKA-21196:
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Thanks for letting me know!
> Release memory held by CoordinatorExecutorImpl tasks when cancelled
> -------------------------------------------------------------------
>
> Key: KAFKA-21196
> URL: https://issues.apache.org/jira/browse/KAFKA-21196
> Project: Kafka
> Issue Type: Improvement
> Components: group-coordinator
> Reporter: Sean Quah
> Assignee: David Jacot
> Priority: Major
>
> When CoordinatorExecutorImpl tasks are cancelled, they remain in the executor
> queue or the event processor queue. When the group coordinator is overloaded,
> these queues can grow large and retain data structures that are no longer
> needed.
> One way we can allow the memory to be reclaimed by GC is to box the callbacks
> held by tasks and release them on cancellation.
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