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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 updated KAFKA-14608:
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Description:
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.
> 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
> 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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