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Posted to jira@kafka.apache.org by "md tanwir (Jira)" <ji...@apache.org> on 2026/08/21 04:29:00 UTC

[jira] [Assigned] (KAFKA-20904) AsyncKafkaConsumer has higher than expected CPU usage

     [ https://issues.apache.org/jira/browse/KAFKA-20904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

md tanwir reassigned KAFKA-20904:
---------------------------------

    Assignee: md tanwir

> AsyncKafkaConsumer has higher than expected CPU usage
> -----------------------------------------------------
>
>                 Key: KAFKA-20904
>                 URL: https://issues.apache.org/jira/browse/KAFKA-20904
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients, consumer
>            Reporter: Evan Zhou
>            Assignee: md tanwir
>            Priority: Blocker
>
> We run scheduled tests of the Consumer to compare perf metrics between the `classic` and `consumer` protocols, and recently noticed CPU usage has doubled for the `consumer` protocol. https://github.com/apache/kafka/pull/22979 seems to be the suspect based on tracking down the commits made in between test runs, but more investigation is needed to figure out why this change caused such a big increase in CPU and what the correct fix is



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