CalvinConfluent opened a new pull request, #12982:
URL: https://github.com/apache/kafka/pull/12982
Even if the follower is the ISR, the follower will be excluded because the
logEndOffset (-1) is less than the fetchOffset (0)
```
if (partition.inSyncReplicaIds.contains(replica.brokerId) &&
replicaState.logEndOffset >= fetchOffset &&
replicaState.logStartOffset <= fetchOffset)
```
https://github.com/CalvinConfluent/kafka/blob/trunk/core/src/main/scala/kafka/server/ReplicaManager.scala#L1252
So the test needs to update its logEndOffset by appending one message.
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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