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https://issues.apache.org/jira/browse/HBASE-71?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12568370#action_12568370
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Bryan Duxbury commented on HBASE-71:
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Speaking with a colleague, instead of rebalancing periodically, maybe we should
just enqueue a rebalancing to occur whenever any event occurs that could
introduce an imbalance. I'm thinking:
* Whole cluster comes online
* Region server comes online
* Region server goes offline
* Region splits
* Region merges (for the future...)
This would allow us to only selectively reassign regions. Are there any other
events that should be tracked that would require us to rebalance?
> [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
> Fix For: 0.2.0
>
>
> 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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