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https://issues.apache.org/jira/browse/HBASE-57?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851247#action_12851247
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Kay Kay commented on HBASE-57:
------------------------------
{quote}
Is there a call you can make to the NN that will give you metadata on a file -
the blocks it comprises of and where they are located?
{quote}
BlockLocation[] DistributedFileSystem#getBlockLocations(String src, long
start, long length);
KFS also has an implementation of FileSystem, appropriately overridden. Is that
the one being referred here ?
> [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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