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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3609) Improve the selection of regions to balance; part 2
Date Wed, 13 Apr 2011 04:36:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13019199#comment-13019199
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Ted Yu commented on HBASE-3609:
-------------------------------

Empty server can be detected within balanceCluster(). But this detection has been performed
by Master, hence the flag.

The static regionId helps make each region Id unique. I actually utilized this fact to debug
my code.

Let me think more about writing unit test(s) that verifies the distribution over underloaded
servers.

Both TestLoadBalancer and TestAdmin pass.

Preliminary response from Stan Barton showed improvement over random selector.
I am waiting for further feedback from gaojinchao@huawei.com and Stan.

> Improve the selection of regions to balance; part 2
> ---------------------------------------------------
>
>                 Key: HBASE-3609
>                 URL: https://issues.apache.org/jira/browse/HBASE-3609
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Assignee: Ted Yu
>         Attachments: 3609-double-alternation.txt, 3609-empty-RS.txt, hbase-3609-by-region-age.txt,
hbase-3609.txt
>
>
> See 'HBASE-3586  Improve the selection of regions to balance' for discussion of algorithms
that improve on current random assignment.

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