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From "Adela Maznikar (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-10939) [89-fb] Adding a rack in HBase in online fashion
Date Wed, 09 Apr 2014 00:31:20 GMT

     [ 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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