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https://issues.apache.org/jira/browse/KAFKA-9731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17163061#comment-17163061
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Shane commented on KAFKA-9731:
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Hey Apache team,
What are the odds of back-porting this to 2.5. I'm seeing the same issues in
2.5.
I can add more details if you want to see, but we're seeing the same increase
in fetch requests per second.
Thanks!
> Increased fetch request rate with leader selector due to HW propagation
> -----------------------------------------------------------------------
>
> Key: KAFKA-9731
> URL: https://issues.apache.org/jira/browse/KAFKA-9731
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 2.4.0, 2.4.1
> Reporter: Vahid Hashemian
> Assignee: Ismael Juma
> Priority: Major
> Fix For: 2.6.0
>
> Attachments: image-2020-03-17-10-19-08-987.png
>
>
> KIP-392 adds high watermark propagation to followers as a means to better
> sync up followers HW with leader. The issue we have noticed after trying out
> 2.4.0 and 2.4.1 is a spike in fetch request rate in the default selector case
> (leader), that does not really require this high watermark propagation:
> !image-2020-03-17-10-19-08-987.png|width=811,height=354!
> This spike causes an increase in resource allocation (CPU) on the brokers.
> An easy solution would be to disable this propagation (at least) for the
> default leader selector case to improve the backward compatibility.
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