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https://issues.apache.org/jira/browse/KAFKA-19736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yu Chia Ma reassigned KAFKA-19736:
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Assignee: Yu Chia Ma
> KAFKA-15665 prevents safe reassignments from completing
> -------------------------------------------------------
>
> Key: KAFKA-19736
> URL: https://issues.apache.org/jira/browse/KAFKA-19736
> Project: Kafka
> Issue Type: Bug
> Reporter: Alyssa Huang
> Assignee: Yu Chia Ma
> Priority: Major
>
> The implementation for KAFKA-15665 is a little too strict - it requires that
> all replicas in the target replica set be in ISR.
> This means if we have a reassignment like [1, 2, 3] -> [2, 3, 4] where broker
> 2 was unhealthy and lagging in replication, reassignment would not complete.
>
> I believe it should work to instead just check the following:
> - Added replicas are in ISR (newTargetISR)
> - Resulting ISR (newTargetISR) is not under-min-isr
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