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From "Kay Kay (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-57) [hbase] Master should allocate regions to regionservers based upon data locality and rack awareness
Date Tue, 30 Mar 2010 05:38:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-57?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851262#action_12851262
] 

Kay Kay commented on HBASE-57:
------------------------------

|  figure which RS had the most blocks local to it and assign the region there

if dfs.replication  > 1 (say 3 , as advised) with N blocks , that would be finding the
RS with the most blocks among the (3 ^ N permutations) + damping to take care of 'hot datanodes'
as you had pointed out. It should be interesting ! 



> [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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