[jira] [Commented] (HBASE-4491) HBase Locality Checker

["Ted Yu (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13115017#comment-13115017 ] 

Ted Yu commented on HBASE-4491:
-------------------------------

@Liyin:
Is the followup task covered by HBASE-4191 ?

Good utility. Looking forward to it.
                
> 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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