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https://issues.apache.org/jira/browse/HBASE-2241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-2241.
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Resolution: Fixed
Assignee: stack
Committed branch and trunk.
> Change balancer sloppyness from 0.1 to 0.3
> ------------------------------------------
>
> Key: HBASE-2241
> URL: https://issues.apache.org/jira/browse/HBASE-2241
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Assignee: stack
> Fix For: 0.20.4, 0.21.0
>
> Attachments: 2241.patch
>
>
> This is a quick workaround until we do a better balancer.
> Taking a region off line when cluster is under load is bad news. Latency
> goes up as we wait on regions to come up in new locations.
> The load balancer should only cut in if the cluster is way out of alignment.
> I'd argue that 10% deviance from the avg. is not good enough reason moving
> regions around when cluster is under load.
> Balancer already has a knack for cutting in at most inopportune moments:
> during cluster startup, when new node is added to a small cluster, or moving
> a region just after its been opened on a node. We'll need to do a better
> balancer but meantime lets just allow that region loading can be sloppier,
> say 20% or 30% off the average before balancer cuts in.
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