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https://issues.apache.org/jira/browse/HBASE-25211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17218356#comment-17218356
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Anoop Sam John commented on HBASE-25211:
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We committed a jira which allows passing exclude hosts and include hosts while
doing regionmover.. So using exclude hosts you can specify all hosts in that
rack?
> Rack awareness in region_mover
> ------------------------------
>
> Key: HBASE-25211
> URL: https://issues.apache.org/jira/browse/HBASE-25211
> Project: HBase
> Issue Type: Improvement
> Reporter: Viraj Jasani
> Priority: Major
>
> region_mover should provide an option to ensure while unloading all regions,
> all destination servers are selected from different racks and not the one
> where server (where region_mover unload is getting executed) belongs to. This
> might be helpful option if we want to avail rack downtime (or rack upgrade)
> by stopping all Regionservers that belong to same rack for few hours. Without
> this option, we don't have any control over which destination server is
> selected and hence, some regions might keep bouncing from server A to B in
> the same rack all the way until they are finally moved to RS that belongs to
> separate rack.
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