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