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From "Anoop Sam John (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4491) HBase Locality Checker
Date Thu, 23 Feb 2012 13:17:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214617#comment-13214617

Anoop Sam John commented on HBASE-4491:

@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
> 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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