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https://issues.apache.org/jira/browse/HBASE-57?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851249#action_12851249
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stack commented on HBASE-57:
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That might do. When it came time to assign a region, you'd get a listing of
all the files its comprised of (Fairly cheap interrogation of NN). You'd then
per file, use the above to figure blocks and their hosts per file. You'd then
take the whole mess and figure which RS had the most blocks local to it and
assign the region there (with some damping to compensate for case where blocks
are unevenly distributed).
> [hbase] Master should allocate regions to regionservers based upon data
> locality and rack awareness
> ---------------------------------------------------------------------------------------------------
>
> Key: HBASE-57
> URL: https://issues.apache.org/jira/browse/HBASE-57
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: master
> Affects Versions: 0.2.0
> Reporter: stack
>
> Currently, regions are assigned regionservers based off a basic loading
> attribute. A factor to include in the assignment calcuation is the location
> of the region in hdfs; i.e. servers hosting region replicas. If the cluster
> is such that regionservers are being run on the same nodes as those running
> hdfs, then ideally the regionserver for a particular region should be running
> on the same server as hosts a region replica.
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