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https://issues.apache.org/jira/browse/KAFKA-3818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15332801#comment-15332801
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Vahid Hashemian commented on KAFKA-3818:
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[~granthenke] I believe the problem you mentioned still exists in round robin 
assignor. Improving this assignor from the fairness point of view would very 
likely involve additional overhead (KIP-49 implementation is an example that 
brings fairness at the expense of a more complex solution). Going back to 
[~hachikuji]'s comment earlier, is this additional overhead accepted for a 
default assignment strategy?

> Change Mirror Maker default assignment strategy to round robin
> --------------------------------------------------------------
>
>                 Key: KAFKA-3818
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3818
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Jason Gustafson
>            Assignee: Vahid Hashemian
>
> It might make more sense to use round robin assignment by default for MM 
> since it gives a better balance between the instances, in particular when the 
> number of MM instances exceeds the typical number of partitions per topic. 
> There doesn't seem to be any need to keep range assignment since 
> copartitioning is not an issue.



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