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https://issues.apache.org/jira/browse/HDFS-4509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved HDFS-4509.
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Resolution: Duplicate
Dupe of HDFS-4420.
> Provide a way to ask Balancer to exclude certain DataNodes in its computation
> and/or work.
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-4509
> URL: https://issues.apache.org/jira/browse/HDFS-4509
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer
> Reporter: Harsh J
> Priority: Minor
>
> This comes particularly useful in clusters that have a split between DNs used
> for regular purpose and DNs used for HBase RSes specifically. By asking the
> balancer to exclude the DNs that RSes run on, its possible to avoid impacting
> HBase's local reads performance, and the balancing of these nodes can be
> deferred to a later time.
> An alternate, and perhaps simpler approach would be to make the Balancer
> file-aware and ask it to skip a specific directory's file's blocks (i.e. that
> of /hbase for example).
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