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Posted to dev@kafka.apache.org by "Yi Ding (Jira)" <ji...@apache.org> on 2023/03/13 18:15:00 UTC

[jira] [Reopened] (KAFKA-14255) Fetching from follower should be disallowed if fetch from follower is disabled

     [ https://issues.apache.org/jira/browse/KAFKA-14255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yi Ding reopened KAFKA-14255:
-----------------------------

> Fetching from follower should be disallowed if fetch from follower is disabled
> ------------------------------------------------------------------------------
>
>                 Key: KAFKA-14255
>                 URL: https://issues.apache.org/jira/browse/KAFKA-14255
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: David Jacot
>            Assignee: David Jacot
>            Priority: Critical
>
> There are clients out there that have implemented KIP-392 (Fetch From Follower) and thus use FetchRequest >= 11. However, they have not implemented KIP-320 which add the leader epoch to the FetchRequest in version 9. Without KIP-320, it is not safe to fetch from the follower. If a client does it by mistake – e.g. based on stale metadata – that could lead to offset out of range.



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