[jira] [Resolved] (HBASE-10939) [89-fb] Adding a rack in HBase in online fashion

["Adela Maznikar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-10939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adela Maznikar resolved HBASE-10939.
------------------------------------

    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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