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From "Bryan Duxbury (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-71) [hbase] Master should rebalance region assignments periodically
Date Thu, 03 Apr 2008 16:30:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-71?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585170#action_12585170
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Bryan Duxbury commented on HBASE-71:
------------------------------------

 > Q: Are the regions displayed by regionserver.jsp sorted?
No, not anymore. Important to do?

 > Q: RegionManager.regionsAwaitingAssignment return Set. Why not List?
Set seemed natural to me. Is List faster than Set? 

> [hbase] Master should rebalance region assignments periodically
> ---------------------------------------------------------------
>
>                 Key: HBASE-71
>                 URL: https://issues.apache.org/jira/browse/HBASE-71
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: master
>            Reporter: Bryan Duxbury
>            Assignee: Bryan Duxbury
>             Fix For: 0.2.0
>
>         Attachments: 71-v2.patch, 71-v3.patch, 71-v4.patch, 71-v5.patch, 71.patch
>
>
> The master currently only does region assignments at startup or when there are splits
or dead regionservers. This means that if you join a new regionserver to the cluster after
startup, it does not get assigned a fair share of the already-served regions as you would
expect. It only gets a share of new regions being served.
> The master should periodically check the balance of regions, based on whatever assignment
function, instead of in reaction to the above listed events.

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