[jira] [Created] (KAFKA-19601) always disallow min.insync.replicas at the broker level

["Jun Rao (Jira)" <ji...@apache.org>]

Jun Rao created KAFKA-19601:
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             Summary: always disallow min.insync.replicas at the broker level
                 Key: KAFKA-19601
                 URL: https://issues.apache.org/jira/browse/KAFKA-19601
             Project: Kafka
          Issue Type: Improvement
            Reporter: Jun Rao


In [https://github.com/apache/kafka/pull/17952,] if ELR is enabled, we (1) disallow min.insync.replicas at the broker level; (2) automatically add min.insync.replicas at the cluster level, if not present; (3) disallow removing min.insync.replicas at the cluster level.  The reason for this is that if brokers disagree about which partitions are under min ISR, it breaks the KIP-966 replication invariants.

However, even if ELR is not enabled, it's bad to have different min.insync.replicas on different brokers since if a leader is moved to a different broker, it will behave differently on the min.insync.replicas semantic. So, it's probably better to always enforce the above regardless whether ELR is enabled or not. Similarly, we probably want to do the same for at least unclean.leader.election.enable.

Since this is a public facing change, it requires a KIP.



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