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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-862) region balancing is clumsy
Date Sun, 07 Sep 2008 20:34:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629008#action_12629008
] 

Andrew Purtell commented on HBASE-862:
--------------------------------------

One problem with simple RR is that not all regionservers may come up at the same time. Still
need to consider region counts (but not load) in the beginning to try to smooth assignments
out. 

Also I will try modifying bin/hbase-daemons.sh to issue commands via SSH in parallel rather
than sequentially, and have start-hbase.sh bring up the regionservers ahead of the master.


> 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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