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https://issues.apache.org/jira/browse/HADOOP-2138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549737
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stack commented on HADOOP-2138:
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This might actually already be happening. Any time I've seen a regionserver
reading from hdfs, it seems to be getting its data from the local datanode.
Verify.
> [hbase] Master should allocate regions to the regionserver hosting the region
> data where possible
> -------------------------------------------------------------------------------------------------
>
> Key: HADOOP-2138
> URL: https://issues.apache.org/jira/browse/HADOOP-2138
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/hbase
> 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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