Jason Gustafson created KAFKA-13837:
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Summary: Return error for Fetch requests from unrecognized
followers
Key: KAFKA-13837
URL: https://issues.apache.org/jira/browse/KAFKA-13837
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
Assignee: Jason Gustafson
If the leader of a partition receives a request from a replica which is not in
the current replica set, we currently return an empty fetch response with no
error. I think the rationale for this is that the leader may not have received
the latest `LeaderAndIsr` update which adds the replica, so we just want the
follower to retry. The problem with this is that if the `LeaderAndIsr` request
never arrives, then there might not be an external indication of a problem.
This probably was the only reasonable option before we added the leader epoch
to the `Fetch` request API. Now that we have it, it would be clearer to return
an `UNKNOWN_LEADER_EPOCH` error to indicate that the (replicaId, leaderEpoch)
tuple is not recognized.
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