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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