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https://issues.apache.org/jira/browse/HBASE-3681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009823#comment-13009823
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Ted Yu commented on HBASE-3681:
-------------------------------
The above approach may surprise some users who would expect sloppiness envelope
to be respected after balancing is done.
It also leads to burst of region re-assignment from one balancing to the next.
It also makes unit testing a little complicated.
> Check the sloppiness of the region load before balancing
> --------------------------------------------------------
>
> Key: HBASE-3681
> URL: https://issues.apache.org/jira/browse/HBASE-3681
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.90.1
> Reporter: Jean-Daniel Cryans
> Assignee: Ted Yu
> Fix For: 0.92.0
>
> Attachments: hbase-3681.txt
>
>
> Per our discussion at the hackathon today, it seems that it would be more
> helpful to add a sloppiness check before doing the normal balancing.
> The current situation is that the balancer always tries to get the region
> load even, meaning that there can be some very frequent regions movement.
> Setting the balancer to run less often (like every 4 hours) isn't much better
> since the load could get out of whack easily.
> This is why running the normal balancer frequently, but first checking for
> some sloppiness in the region load across the RS, seems like a more viable
> option.
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