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Date: Sat, 8 Sep 2012 08:42:08 +1100 (NCT)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <945350096.52487.1347054128966.JavaMail.jiratomcat@arcas>
In-Reply-To: <338363458.52051.1347049447585.JavaMail.jiratomcat@arcas>
Subject: [jira] [Commented] (HBASE-6744) Per table balancing could cause
 regions unbalanced overall
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    [ https://issues.apache.org/jira/browse/HBASE-6744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451016#comment-13451016 ] 

stack commented on HBASE-6744:
------------------------------

+1 on making SLB default now.  Testing for 0.96.0 should shake out any bugs.  On its face alone, it has a potential far in excess of the current, hard to untangle, served-us well up-to-this, but needs-to-be retired now current balancer.
                
> Per table balancing could cause regions unbalanced overall
> ----------------------------------------------------------
>
>                 Key: HBASE-6744
>                 URL: https://issues.apache.org/jira/browse/HBASE-6744
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jimmy Xiang
>
> Per table balancing just balances regions based on tables.  However, overall, regions could be seriously unbalanced.
> For example, if you shutdown all most all region serves in a cluster, then create tons of new tables (no region pre-split), then start up all region servers.  You will see the regions won't move to other region servers since they are balanced per table (only one region for a table at this moment).
> If we can make the balance algorithm sophisticated enough, we don't need the configuration hbase.master.loadbalance.bytable.  We can do the regular and bytable balancing at the same time.

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