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https://issues.apache.org/jira/browse/HBASE-4491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214617#comment-13214617
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Anoop Sam John commented on HBASE-4491:
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@Liyin: Looks very useful. Any update on this new feature
> HBase Locality Checker
> ----------------------
>
> Key: HBASE-4491
> URL: https://issues.apache.org/jira/browse/HBASE-4491
> Project: HBase
> Issue Type: New Feature
> Reporter: Liyin Tang
> Assignee: Liyin Tang
>
> If we run data node and region server in the same physical machine, region
> server will be benefit if the store files for its serving regions have a
> local replica in the data node process.
> So for each regions, there exists a best locality region server which has
> most local blocks for this region.
> The HBase Locality Checker will show how many regions is running on its best
> locality region server.
> The higher the number is, the more performance benefits HBase can get from
> data locality.
> Also there would be a followup task to use these region locality information
> for region assignment. Assignment manager will prefer assign regions to its
> best locality region server.
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