Jason Gustafson created KAFKA-9938:
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Summary: Fix debug consumer read from follower for older protocol
versions
Key: KAFKA-9938
URL: https://issues.apache.org/jira/browse/KAFKA-9938
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
Assignee: Jason Gustafson
In fetch requests, a sentinel of -2 for the replicaId is treated as a "debug
consumer" and is allowed to fetch from followers. In KIP-392, we added the
general ability to read from followers, but we require a newer version of the
protocol. In the process of this change, we lost the ability for older version
of the fetch protocol to use the "debug consumer" to read from followers. As
far as I know the only place this capability is used is in the
ReplicaVerificationTool. We don't expose this capability from the consumer.
However, it is still technically a regression and should be fixed.
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