Luke Chen created KAFKA-16247:
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Summary: 1 replica keep out-of-sync after migrating broker to KRaft
Key: KAFKA-16247
URL: https://issues.apache.org/jira/browse/KAFKA-16247
Project: Kafka
Issue Type: Bug
Reporter: Luke Chen
We are deploying 3 controllers and 3 brokers, and following the steps in
[doc|https://kafka.apache.org/documentation/#kraft_zk_migration]. When we're
moving from "Enabling the migration on the brokers" state to "Migrating brokers
to KRaft" state, the first rolled broker becomes out-of-sync and never become
in-sync.
>From the log, we can see some "reject alterPartition" errors, but it just
>happen 2 times. Theoretically, the leader should add the follower into ISR as
>long as the follower is fetching since we don't have client writing data. But
>can't figure out why it didn't fetch.
Logs: https://gist.github.com/showuon/64c4dcecb238a317bdbdec8db17fd494
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