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https://issues.apache.org/jira/browse/HADOOP-2527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565222#action_12565222
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Bryan Duxbury commented on HADOOP-2527:
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One proposed solution is to have the master have some small amount of quiet
time on startup where it won't assign regions other than ROOT and META. This
would allow all the region servers to start up, so that when assignment starts,
it will be more balanced across all region servers instead of skewed towards
those that connected first.
> [hbase] Master does not load balance regions well on startup
> ------------------------------------------------------------
>
> Key: HADOOP-2527
> URL: https://issues.apache.org/jira/browse/HADOOP-2527
> Project: Hadoop Core
> Issue Type: Improvement
> Components: contrib/hbase
> Affects Versions: 0.16.0
> Environment: CentOS 5
> Reporter: Chris Kline
> Fix For: 0.17.0
>
>
> We get poor distribution of regions when we start up HBase. We have a total
> of 13 nodes and 898 regions, which should yield an average of 69 regions per
> node. Instead, one node has 173 regions and one node has 16 regions.
> Address Start Code Load
> 10.100.11.62:60020 1199406218912 requests: 0 regions: 63
> 10.100.11.59:60020 1199406219179 requests: 0 regions: 55
> 10.100.11.60:60020 1199406219062 requests: 0 regions: 90
> 10.100.11.61:60020 1199406219132 requests: 1 regions: 54
> 10.100.11.64:60020 1199406218817 requests: 0 regions: 173
> 10.100.11.31:60020 1199406219039 requests: 1 regions: 16
> 10.100.11.58:60020 1199406218895 requests: 0 regions: 89
> 10.100.11.56:60020 1199406219037 requests: 0 regions: 76
> 10.100.11.65:60020 1199406219135 requests: 0 regions: 56
> 10.100.11.57:60020 1199406219183 requests: 1 regions: 56
> 10.100.11.33:60020 1199406219174 requests: 1 regions: 56
> 10.100.11.32:60020 1199406218944 requests: 0 regions: 66
> 10.100.11.63:60020 1199406219182 requests: 0 regions: 48
> Total: servers: 13 requests: 4 regions: 898
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