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From "Adela Maznikar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10939) [89-fb] Adding a rack in HBase in online fashion
Date Wed, 09 Apr 2014 00:15:15 GMT
Adela Maznikar created HBASE-10939:
--------------------------------------

             Summary: [89-fb] Adding a rack in HBase in online fashion
                 Key: HBASE-10939
                 URL: https://issues.apache.org/jira/browse/HBASE-10939
             Project: HBase
          Issue Type: New Feature
          Components: Region Assignment
    Affects Versions: 0.89-fb
            Reporter: Adela Maznikar
             Fix For: 0.89-fb


RegionPlacement -exprack to add a new rack into the region placement. So far we have a static
assignment plan and 3 preferred locations for a region, such that the primary is the location
which is serving all requests and hdfs locality is very high on all 3 nodes. 
-exprack is moving the the third preferred location on the new rack such that it leaves the
cluster in balanced state. After a few days locality is high enough and we make some of this
new locations primaries such that again we have a balanced state in number of primaries per
regionservers in the entire cluster.



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