[jira] Commented: (HBASE-3373) Allow regions of specific table to be load-balanced

["Ted Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-3373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976431#action_12976431 ] 

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

Currently, regions offloaded from the most overloaded server would be assigned to most underloaded server first. When some regions are actively splitting on the most overloaded server, this arrangement is sub-optimal.
A better way is to round-robin assign regionsToMove over underloaded servers.

> 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: 0.90.1
>
>
> 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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