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https://issues.apache.org/jira/browse/HBASE-22356?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell updated HBASE-22356:
----------------------------------------
    Fix Version/s:     (was: 2.2.2)
                   2.3.0

> API to get hdfs block distribution from regionservers
> -----------------------------------------------------
>
>                 Key: HBASE-22356
>                 URL: https://issues.apache.org/jira/browse/HBASE-22356
>             Project: HBase
>          Issue Type: Sub-task
>          Components: API, Balancer, regionserver
>            Reporter: Thiruvel Thirumoolan
>            Assignee: Thiruvel Thirumoolan
>            Priority: Major
>              Labels: balancer
>             Fix For: 3.0.0, 2.3.0, 1.6.0
>
>         Attachments: HBASE-22356.master.001.patch, 
> HBASE-22356.master.002.patch
>
>
> A RegionServer API has to be added which will return HDFSBlockDistribution 
> for all the regions it hosts. RS already has this info cached and updated 
> when flush/compaction happens. Master can query and get instead of hitting 
> the namenode and caching. The larger the cluster becomes, the more costly it 
> becomes to get this information and more stale the cached information becomes.
> This jira is only to add the API to regionserver.



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