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https://issues.apache.org/jira/browse/KAFKA-19601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18013517#comment-18013517
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Jun Rao commented on KAFKA-19601:
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Thanks, [~yung] !
> 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
> Assignee: Jhen-Yung Hsu
> Priority: Major
>
> 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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