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https://issues.apache.org/jira/browse/HBASE-13682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16813910#comment-16813910
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Rushabh S Shah commented on HBASE-13682:
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[~eclark]: Is this still an issue ?
If yes, could you please point me to relevant code section that I can look
into. I am new to hbase project and wants to make some impact in hbase project.
Thanks in advance.
> 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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