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https://issues.apache.org/jira/browse/HBASE-10939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adela Maznikar resolved HBASE-10939.
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Resolution: Fixed
code in RegionPlacement.expandRegionsToNewRack(...)
> [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
> Assignee: 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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