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https://issues.apache.org/jira/browse/KAFKA-18655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeff Kim resolved KAFKA-18655.
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Resolution: Fixed
> Implement the consumer group size counter with scheduled task
> -------------------------------------------------------------
>
> Key: KAFKA-18655
> URL: https://issues.apache.org/jira/browse/KAFKA-18655
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Dongnuo Lyu
> Assignee: Dongnuo Lyu
> Priority: Blocker
> Fix For: 4.0.0
>
>
> During testing we discovered that the empty group count is not updated in
> group conversion, but when the new group is transition to other state, the
> empty group count is decremented. This could result in negative empty group
> count.
> We can have a new consumer group count implementation that follows the
> pattern we did for the classic group count. The timeout task periodically
> refreshes the metrics based on the current groups soft state.
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