ezhou413 opened a new pull request, #22836:
URL: https://github.com/apache/kafka/pull/22836

   This PR fixes the heartbeat spin issue for the `consumer` protocol. In the 
process of reproducing the issue, I found that both the application and 
background threads have high CPU, and fixes for both threads are in this PR
   
   Jira: https://issues.apache.org/jira/browse/KAFKA-20253


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