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Posted to jira@kafka.apache.org by "David Jacot (Jira)" <ji...@apache.org> on 2022/09/22 08:26:00 UTC

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

David Jacot created KAFKA-14255:
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             Summary: 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


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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