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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