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https://issues.apache.org/jira/browse/HBASE-57?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858975#action_12858975
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stack commented on HBASE-57:
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@Jan Do you see this: ",,,in extreme case, single DataNode may (in some time)
be handling reads from all the Mappers"? On a long-running cluster, blocks
will migrate to be local to the regoinserver that is serving them. Is this not
happening in your case? Are you seeing RSs mostly reaching across the net to
remote DNs?
> [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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