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https://issues.apache.org/jira/browse/KAFKA-9205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16976895#comment-16976895
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Vahid Hashemian commented on KAFKA-9205:
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This will still likely require a KIP since the default behavior could change.
> Add an option to enforce rack-aware partition reassignment
> ----------------------------------------------------------
>
> Key: KAFKA-9205
> URL: https://issues.apache.org/jira/browse/KAFKA-9205
> Project: Kafka
> Issue Type: Improvement
> Components: admin, tools
> Reporter: Vahid Hashemian
> Priority: Minor
>
> One regularly used healing operation on Kafka clusters is replica
> reassignments for topic partitions. For example, when there is a skew in
> inbound/outbound traffic of a broker replica reassignment can be used to move
> some leaders/followers from the broker; or if there is a skew in disk usage
> of brokers, replica reassignment can more some partitions to other brokers
> that have more disk space available.
> In Kafka clusters that span across multiple data centers (or availability
> zones), high availability is a priority; in the sense that when a data center
> goes offline the cluster should be able to resume normal operation by
> guaranteeing partition replicas in all data centers.
> This guarantee is currently the responsibility of the on-call engineer that
> performs the reassignment or the tool that automatically generates the
> reassignment plan for improving the cluster health (e.g. by considering the
> rack configuration value of each broker in the cluster). the former, is quite
> error-prone, and the latter, would lead to duplicate code in all such admin
> tools (which are not error free either). Not all use cases can make use the
> default assignment strategy that is used by --generate option; and current
> rack aware enforcement applies to this option only.
> It would be great for the built-in replica assignment API and tool provided
> by Kafka to support a rack aware verification option for --execute scenario
> that would simply return an error when [some] brokers in any replica set
> share a common rack.
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