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https://issues.apache.org/jira/browse/KAFKA-9124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17324357#comment-17324357
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Colin McCabe commented on KAFKA-9124:
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[~mumrah] implemented this here: https://github.com/apache/kafka/pull/9100
> KIP-497: ISR changes should be propagated via Kafka protocol
> ------------------------------------------------------------
>
> Key: KAFKA-9124
> URL: https://issues.apache.org/jira/browse/KAFKA-9124
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Viktor Somogyi-Vass
> Assignee: David Arthur
> Priority: Major
>
> Currently {{Partition.expandIsr}} and {{Partition.shrinkIsr}} updates
> Zookeeper which is listened by the controller and that's how it notices the
> ISR changes and sends out metadata requests.
> Instead of this the brokers should use Kafka protocol messages to send out
> ISR change notifications.
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