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https://issues.apache.org/jira/browse/HBASE-8432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642785#comment-13642785
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Jean-Marc Spaggiari commented on HBASE-8432:
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Thanks for the followup [~aaronwq]. Have you tried also the other scenarios? 
Like regions# < RS#/2 and regions# > RS#? Are they all still working fine?
                
> a table with unbalanced regions will balance indefinitely with the 
> 'org.apache.hadoop.hbase.master.DefaultLoadBalancer'
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-8432
>                 URL: https://issues.apache.org/jira/browse/HBASE-8432
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer
>    Affects Versions: 0.94.5
>         Environment: Linux 2.6.32-el5.x86_64
>            Reporter: Wang Qiang
>            Priority: Critical
>         Attachments: patch_20130425_01.txt
>
>
> it happened that a table with unbalanced regions, as follows in my 
> cluster(the cluster has 20 regionservers, the table has 12 regions):
> http://hadoopdev19.cm6:60030/ 1
> http://hadoopdev8.cm6:60030/  2
> http://hadoopdev17.cm6:60030/ 1
> http://hadoopdev12.cm6:60030/ 1
> http://hadoopdev5.cm6:60030/  1
> http://hadoopdev9.cm6:60030/  1
> http://hadoopdev22.cm6:60030/ 1
> http://hadoopdev11.cm6:60030/ 1
> http://hadoopdev21.cm6:60030/ 1
> http://hadoopdev16.cm6:60030/ 1
> http://hadoopdev10.cm6:60030/ 1
> with the 'org.apache.hadoop.hbase.master.DefaultLoadBalancer', after 5 times 
> load-balances, the table are still unbalanced:
> http://hadoopdev3.cm6:60030/  1
> http://hadoopdev20.cm6:60030/ 1
> http://hadoopdev4.cm6:60030/  2
> http://hadoopdev18.cm6:60030/ 1
> http://hadoopdev12.cm6:60030/ 1
> http://hadoopdev14.cm6:60030/ 1
> http://hadoopdev15.cm6:60030/ 1
> http://hadoopdev6.cm6:60030/  1
> http://hadoopdev13.cm6:60030/ 1
> http://hadoopdev11.cm6:60030/ 1
> http://hadoopdev10.cm6:60030/ 1
> http://hadoopdev19.cm6:60030/ 1
> http://hadoopdev17.cm6:60030/ 1
> http://hadoopdev8.cm6:60030/  1
> http://hadoopdev5.cm6:60030/  1
> http://hadoopdev12.cm6:60030/ 1
> http://hadoopdev22.cm6:60030/ 1
> http://hadoopdev11.cm6:60030/ 1
> http://hadoopdev21.cm6:60030/ 1
> http://hadoopdev7.cm6:60030/  2
> http://hadoopdev10.cm6:60030/ 1
> http://hadoopdev16.cm6:60030/ 1
> http://hadoopdev3.cm6:60030/  1
> http://hadoopdev20.cm6:60030/ 1
> http://hadoopdev4.cm6:60030/  1
> http://hadoopdev18.cm6:60030/ 2
> http://hadoopdev12.cm6:60030/ 1
> http://hadoopdev14.cm6:60030/ 1
> http://hadoopdev15.cm6:60030/ 1
> http://hadoopdev6.cm6:60030/  1
> http://hadoopdev13.cm6:60030/ 1
> http://hadoopdev11.cm6:60030/ 1
> http://hadoopdev10.cm6:60030/ 1
> http://hadoopdev19.cm6:60030/ 1
> http://hadoopdev8.cm6:60030/  1
> http://hadoopdev17.cm6:60030/ 1
> http://hadoopdev12.cm6:60030/ 1
> http://hadoopdev5.cm6:60030/  1
> http://hadoopdev22.cm6:60030/ 1
> http://hadoopdev11.cm6:60030/ 1
> http://hadoopdev7.cm6:60030/  1
> http://hadoopdev21.cm6:60030/ 2
> http://hadoopdev16.cm6:60030/ 1
> http://hadoopdev10.cm6:60030/ 1
> http://hadoopdev3.cm6:60030/  1
> http://hadoopdev20.cm6:60030/ 1
> http://hadoopdev18.cm6:60030/ 1
> http://hadoopdev4.cm6:60030/  1
> http://hadoopdev12.cm6:60030/ 1
> http://hadoopdev15.cm6:60030/ 1
> http://hadoopdev14.cm6:60030/ 2
> http://hadoopdev6.cm6:60030/  1
> http://hadoopdev13.cm6:60030/ 1
> http://hadoopdev11.cm6:60030/ 1
> http://hadoopdev10.cm6:60030/ 1
> from the above logs, we can also find that some regions needn't move, but 
> they moved. follow into 
> 'org.apache.hadoop.hbase.master.DefaultLoadBalancer.balanceCluster()', I 
> found that 'maxToTake' is error calculated. 

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