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https://issues.apache.org/jira/browse/HDFS-16545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17523806#comment-17523806
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Renukaprasad C commented on HDFS-16545:
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Thanks [~liuml07] for the quick review & feedback.
Once rack based balancer executed, it will balance the blocks with-in the rack.
These DNs (balanced with rack based balancer) wont participate in the global
balancer (without rack option / cluster-wide).
"Also do we plan to allow multiple rack-wide balancers (different racks)?"
So far we considered single rack balance. Need to analyze further to support
multiple racks.
> Provide option to balance rack level in Balancer
> ------------------------------------------------
>
> Key: HDFS-16545
> URL: https://issues.apache.org/jira/browse/HDFS-16545
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Renukaprasad C
> Assignee: Renukaprasad C
> Priority: Minor
>
> Currently Balancer tool run on entire cluster and balance across the racks.
> In we need to balance within a rack, then need to provide an option to
> support the rack level balancing.
> [~surendralilhore] [~hemanthboyina]
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