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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 Thu, 10 Mar 2011 19:12:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005261#comment-13005261
] 

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

In preparation for HBASE-3616, I think we need to enhance this method in SplitTransaction:
{code}
  HRegion createDaughterRegion(final HRegionInfo hri,
      final FlushRequester flusher)
{code}
requestsCount is initially 0 for daughter regions which doesn't reflect the fact that parent
region has been heavily accessed.
Maybe we can assign half of requestsCount of parent region to each daughter region ?

> 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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