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https://issues.apache.org/jira/browse/KAFKA-10649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17221296#comment-17221296
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Ismael Juma commented on KAFKA-10649:
-------------------------------------
Thanks for the report. This is likely KAFKA-9731. I would suggest upgrading to
2.6.0.
> CPU increase after the upgrade to Kafka 2.5
> -------------------------------------------
>
> Key: KAFKA-10649
> URL: https://issues.apache.org/jira/browse/KAFKA-10649
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 2.5.1
> Environment: Ubuntu 16.04
> Reporter: Valentina Glagoleva
> Priority: Major
> Labels: performance
> Attachments: CPU_usage_grafana.png
>
>
> After an upgrade from Kafka 2.2.1 to Kafka 2.5.1 we noticed, that some of our
> clusters now use 10-15% more CPU than before:
> !CPU_usage_grafana.png|width=613,height=210!
> The increase happened right after the rolling upgrade of the cluster and CPU
> usage stayed higher than usual since then.
> We made no changes to the application side or usage patterns.
> The only thing that we noticed is that number of FETCH request seemed to
> increase a bit as well. These additional fetch requests seem to come from
> brokers intercommunication.
> What can be the reason for an increase of number of fetch requests and CPU
> usage?
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