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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-862) region balancing is clumsy
Date Mon, 08 Sep 2008 01:48:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629038#action_12629038
] 

Jim Kellerman commented on HBASE-862:
-------------------------------------

When a cluster starts, it might help if the master knew how many region servers to expect
to report in. It could then divide the number of regions by n servers, and if n servers didn't
report in by the time the root and meta were assigned (for example), or after some configurable
interval, the master could assume that the servers were not going to report in and assign
the remaining regions over the n - (missing servers)


> 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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