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https://issues.apache.org/jira/browse/KAFKA-18807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-18807.
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Fix Version/s: 4.0.0
Resolution: Fixed
> Group coordinator under-reports thread idle time
> ------------------------------------------------
>
> Key: KAFKA-18807
> URL: https://issues.apache.org/jira/browse/KAFKA-18807
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator
> Reporter: Sean Quah
> Assignee: Sean Quah
> Priority: Minor
> Fix For: 4.0.0
>
>
> When events arrive at the event processor with less than
> 1/group.coordinator.threads ms between them, the thread idle time is rounded
> down to 0 because of integer division.
> eg. when the group coordinator has 8 threads, and it receives >1k offset
> commit requests per second evenly split across shards, the thread idle time
> metric will be under-reported.
> https://github.com/apache/kafka/blob/2353a7c5081b53402d5092afd255e2bdf7aa2d20/coordinator-common/src/main/java/org/apache/kafka/coordinator/common/runtime/MultiThreadedEventProcessor.java#L141
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