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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6744) Per table balancing could cause regions unbalanced overall
Date Fri, 07 Sep 2012 20:24:07 GMT
Jimmy Xiang created HBASE-6744:
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             Summary: 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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