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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-862) region balancing is clumsy
Date Thu, 04 Sep 2008 16:11:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628366#action_12628366
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Jim Kellerman commented on HBASE-862:
-------------------------------------

If you factor in load, you'll need a more sophisticated algorithm than we had in the past.
Because the META region gets so much traffic, the previous algorithm would never assign any
other regions to the server handling META (or rarely).

Since we've already discussed not doing balancing until all regions are loaded, maybe factoring
(a more sophisticated) load at that point would be ok.

> 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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