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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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