Adela Maznikar created HBASE-10939:
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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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