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https://issues.apache.org/jira/browse/HBASE-3373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991720#comment-12991720
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Ted Yu commented on HBASE-3373:
-------------------------------
The loop in balanceCluster(Map<HServerInfo, List<HRegionInfo>>) which fills out
destination servers for regionsToMove currently iterates underloadedServers in
the same direction (from index 0 up).
This works for load metric being number of regions.
If we use number of requests as load metric, we should iterate from index 0 up,
then back down to index 0, so forth. This would give us better load
distribution.
> Allow regions of specific table to be load-balanced
> ---------------------------------------------------
>
> Key: HBASE-3373
> URL: https://issues.apache.org/jira/browse/HBASE-3373
> Project: HBase
> Issue Type: Improvement
> Components: master
> Affects Versions: 0.20.6
> Reporter: Ted Yu
> Fix For: 0.92.0
>
> Attachments: HbaseBalancerTest2.java
>
>
> From our experience, cluster can be well balanced and yet, one table's
> regions may be badly concentrated on few region servers.
> For example, one table has 839 regions (380 regions at time of table
> creation) out of which 202 are on one server.
> It would be desirable for load balancer to distribute regions for specified
> tables evenly across the cluster. Each of such tables has number of regions
> many times the cluster size.
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