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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3679) Provide cost information associated with moving region(s)
Date Tue, 22 Mar 2011 00:52:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009498#comment-13009498
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Ted Yu commented on HBASE-3679:
-------------------------------

What would be a good way to measure (aggregately) latency incurred on client side ?

> 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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