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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3373) Allow regions of specific table to be load-balanced
Date Mon, 07 Feb 2011 23:52:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991720#comment-12991720
] 

Ted Yu commented on HBASE-3373:
-------------------------------

The loop in balanceCluster(Map<HServerInfo, List<HRegionInfo>>) which fills out
destination servers for regionsToMove currently iterates underloadedServers in the same direction
(from index 0 up).
This works for load metric being number of regions.
If we use number of requests as load metric, we should iterate from index 0 up, then back
down to index 0, so forth. This would give us better load distribution.

> Allow regions of specific table to be load-balanced
> ---------------------------------------------------
>
>                 Key: HBASE-3373
>                 URL: https://issues.apache.org/jira/browse/HBASE-3373
>             Project: HBase
>          Issue Type: Improvement
>          Components: master
>    Affects Versions: 0.20.6
>            Reporter: Ted Yu
>             Fix For: 0.92.0
>
>         Attachments: HbaseBalancerTest2.java
>
>
> From our experience, cluster can be well balanced and yet, one table's regions may be
badly concentrated on few region servers.
> For example, one table has 839 regions (380 regions at time of table creation) out of
which 202 are on one server.
> It would be desirable for load balancer to distribute regions for specified tables evenly
across the cluster. Each of such tables has number of regions many times the cluster size.

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