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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6744) Per table balancing could cause regions unbalanced overall
Date Fri, 07 Sep 2012 20:40:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450952#comment-13450952
] 

Elliott Clark commented on HBASE-6744:
--------------------------------------

The StochasticLoadBalancer that was added a little while ago should give you the best of both
worlds.  It tries to spread all tables as much as posible without making things too unbalanced.
 Does that work for you? or were you thinking of something different ?
                
> 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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