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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-862) region balancing is clumsy
Date Tue, 02 Sep 2008 21:09:44 GMT
region balancing is clumsy
--------------------------

                 Key: HBASE-862
                 URL: https://issues.apache.org/jira/browse/HBASE-862
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack


Daniel Leffel has an install of 500 regions on 4 nodes.  He's running 0.2.0.

On restart, load balancing is running while the 600 regions are being initially opened.  Makes
for churn.  Load balancing should wait before it cuts in.

Have also seen on occasion that it will not find equilibrium after a restart.

Adding a node is catastrophic.  >20% of the regions were closed and were taking the longest
time to show up on the new server.  I would think that the region balancing would work in
more sophisticated and gradual manner.

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