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https://issues.apache.org/jira/browse/HBASE-1676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733379#action_12733379
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stack commented on HBASE-1676:
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Lets move the assignment code to its own class to facilitate testing alogrithm
in isolation. Then write one million unit tests for it.
> load balancing on a large cluster doesn't work very well
> --------------------------------------------------------
>
> Key: HBASE-1676
> URL: https://issues.apache.org/jira/browse/HBASE-1676
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: ryan rawson
> Fix For: 0.20.1
>
>
> I have 200 regions per server in my cluster. When I take one down, then
> bring it back up, I only end up with about 30 regions assigned to it. This
> is highly reproducible.
> Furthermore, the assignment algorithm will do silly things like assign all
> regions of a table to one regionserver - even if it's the best server. We
> need to be smarter about optimizing how regions are assigned if we want to
> achieve maximal performance on our clusters.
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