Sean Quah created KAFKA-18807:
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Summary: 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
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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