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https://issues.apache.org/jira/browse/HBASE-22300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17378549#comment-17378549
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David Manning commented on HBASE-22300:
---------------------------------------
and more specifically in subtasks HBASE-25947 or HBASE-25894
> SLB doesn't perform well with increase in number of regions
> -----------------------------------------------------------
>
> Key: HBASE-22300
> URL: https://issues.apache.org/jira/browse/HBASE-22300
> Project: HBase
> Issue Type: Improvement
> Components: Balancer
> Reporter: Biju Nair
> Assignee: David Manning
> Priority: Major
> Labels: balancer
> Attachments: CostFromRegionLoadFunctionNew.rtf
>
>
> With increase in number of regions in a cluster the number of steps taken by
> balancer in 30 sec (default balancer runtime) reduces noticeably. The
> following is the number of steps taken with by balancer with region loads set
> and running it without the loads being set i.e. cost functions using region
> loads are not fully exercised.
> {noformat}
> Nodes regions Tables # of steps # of steps
> with RS Load With no load
> 5 50 5 200000 200000
> 100 2000 110 104707 1000000
>
> 100 10000 40 19911 1000000
>
> 200 100000 400 870 1000000
> {noformat}
> As one would expect the reduced number of steps also makes the balancer take
> long time to get to an optimal cost. Note that only 2 data points were used
> in the region load histogram while in practice 15 region load data points are
> remembered.
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