[jira] [Assigned] (KAFKA-9731) Increased fetch request rate with leader selector due to HW propagation

["Ismael Juma (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-9731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ismael Juma reassigned KAFKA-9731:
----------------------------------

    Assignee: Ismael Juma

> 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
>         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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