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https://issues.apache.org/jira/browse/HBASE-71?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585181#action_12585181
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Jim Kellerman commented on HBASE-71:
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>Bryan Duxbury - 03/Apr/08 09:28 AM
>> Q: Are the regions displayed by regionserver.jsp sorted?
> No, not anymore. Important to do?
People complained when they weren't.
>> Q: RegionManager.regionsAwaitingAssignment return Set. Why not List?
> Set seemed natural to me. Is List faster than Set?
If all you are doing is adding and iterating and don't care if there already is
an entry, then yes, List is much faster than Set. On the other hand, with a
HashSet, you don't pay much of a penalty for that check. But something to
consider in the future.
> [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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