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https://issues.apache.org/jira/browse/KAFKA-14608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Grant reassigned KAFKA-14608:
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Assignee: Andrew Grant
> Make sure reassignment does not cause under min ISR
> ---------------------------------------------------
>
> Key: KAFKA-14608
> URL: https://issues.apache.org/jira/browse/KAFKA-14608
> Project: Kafka
> Issue Type: Improvement
> Reporter: Andrew Grant
> Assignee: Andrew Grant
> Priority: Major
>
> In KRaft mode we complete reassignments only when the adding replicas have
> been added to the ISR - see
> [https://github.com/apache/kafka/blob/trunk/metadata/src/main/java/org/apache/kafka/controller/PartitionChangeBuilder.java#L288.]
> As a result its possible for the partition to go under min ISR if the number
> of adding replicas is less than the topic's under min ISR config.
> This behavior differs to ZK mode where we require all target replicas to be
> in the ISR for the reassignment to complete - see
> https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/controller/KafkaController.scala#L1003.
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