David Mao created KAFKA-13134:
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             Summary: Heartbeat Request high lock contention
                 Key: KAFKA-13134
                 URL: https://issues.apache.org/jira/browse/KAFKA-13134
             Project: Kafka
          Issue Type: Improvement
          Components: core
            Reporter: David Mao
            Assignee: David Mao


On a cluster with high heartbeat rate, a lock profile showed high contention 
for the GroupMetadata lock.

We can significantly reduce this by invoking the response callback outside of 
the group metadata lock.



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