[jira] [Commented] (KAFKA-8495) Make Round-robin / RangeAssignor to be "sticky" (part 5)

["Boyang Chen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-8495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16857233#comment-16857233 ] 

Boyang Chen commented on KAFKA-8495:
------------------------------------

FYI we do have one ongoing diff to make those coordinator sticky on instance.id level:
[https://github.com/apache/kafka/pull/6815]

> Make Round-robin / RangeAssignor to be "sticky" (part 5)
> --------------------------------------------------------
>
>                 Key: KAFKA-8495
>                 URL: https://issues.apache.org/jira/browse/KAFKA-8495
>             Project: Kafka
>          Issue Type: Sub-task
>            Reporter: Guozhang Wang
>            Priority: Major
>
> For this new algorithm to be effective in reducing rebalance costs, it is really expecting the plug-in assignor to be "sticky" in some way, such that the diff of the newly-assigned-partitions and the existing-assigned-partitions can be small, and hence only a few subset of the total number of partitions need to be revoked / migrated at each rebalance in practice – otherwise, we are just paying more rebalance for little benefits.



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