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https://issues.apache.org/jira/browse/HBASE-3507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991605#comment-12991605
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Ted Yu commented on HBASE-3507:
-------------------------------
In rebalance(), regions_table maps request count to region. However, we should
consider regions with same number of requests - hash collision.
Also, we should consider the current region assignment before calling
admin.move()
e.g. consider the top two most heavily read regions A (on RS1) and B (on RS2)
If later requests for B get higher than requests for A, current patch would
shuffle region A (to RS2) with region B - an unnecessary action.
Using more complex logic, we should balance the sum of requests landed on each
region server.
> requests count per HRegion and rebalance command
> ------------------------------------------------
>
> Key: HBASE-3507
> URL: https://issues.apache.org/jira/browse/HBASE-3507
> Project: HBase
> Issue Type: Improvement
> Components: performance, regionserver
> Reporter: Sebastian Bauer
> Priority: Trivial
> Attachments: hbase-requestsCount-2.patch, hbase-requestsCount.patch
>
>
> Path-1 add another mertic for HRegion to count request made to region.
> Path-2 add another command to hbase shell to grab all regions, sort by
> requests from Path-1 and move in round-robin algorithm to servers
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