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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3609) Improve the selection of regions to balance; part 2
Date Wed, 13 Apr 2011 04:50:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13019204#comment-13019204
] 

stack commented on HBASE-3609:
------------------------------

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

Thats fair.  Its nice having the balance invocation method simple as possible though.

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

I missed that it was being used.

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

I think that if you get good feedback from others, that'll help getting this patch committed.

Good stuff Ted.

> 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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