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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 Wed, 01 Jun 2011 03:01:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041954#comment-13041954

Ted Yu commented on HBASE-3679:

>From Anty Rao:
When doing balance, Can we take into account the compaction status of regions.
Currently, even the region is doing compaction, it can also be interrupted
to response to reassign.

> 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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