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https://issues.apache.org/jira/browse/HBASE-13682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Biju Nair updated HBASE-13682:
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Component/s: Balancer
> Compute HDFS locality in parallel.
> ----------------------------------
>
> Key: HBASE-13682
> URL: https://issues.apache.org/jira/browse/HBASE-13682
> Project: HBase
> Issue Type: Bug
> Components: Balancer
> Reporter: Elliott Clark
> Priority: Major
>
> Right now when the balancer needs to know about region locality it asks the
> cache in serial. When the cache is empty or expired it goes to the NN.
> On larger clusters with lots of blocks this can be really slow. That means
> that balancer is un-usable while masters are being restarted.
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