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https://issues.apache.org/jira/browse/HBASE-3679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009495#comment-13009495
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dhruba borthakur commented on HBASE-3679:
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What would we do in the following case:
We have two region servers A and B in the cluster, A is doing 20K ops/sec while
B is doing 5K ops/second. A client is encountering 10 ms latency per call from
A while it sees a 30 ms latency per call from B.
Are we going to move load from A to B or vice-versa?
> Provide cost information associated with moving region(s)
> ---------------------------------------------------------
>
> Key: HBASE-3679
> URL: https://issues.apache.org/jira/browse/HBASE-3679
> Project: HBase
> Issue Type: Improvement
> Reporter: Ted Yu
>
> In order for load balancer to make better decision, we need to establish cost
> model for moving region(s).
> One factor would be the number of active scanners on a particular region.
> This count is easy to maintain at HRegion level. instantiateInternalScanner()
> can increment the counter and RegionScanner.close() would decrement the count.
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