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https://issues.apache.org/jira/browse/HBASE-3521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15197526#comment-15197526
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Nick Dimiduk commented on HBASE-3521:
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This ticket was a top search hit for so adding a link to the new feature.
> region be merged with others automatically when all data in the region has
> expired and removed, or region gets too small.
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-3521
> URL: https://issues.apache.org/jira/browse/HBASE-3521
> Project: HBase
> Issue Type: Improvement
> Components: master, regionserver, scripts
> Affects Versions: 0.90.0
> Reporter: zhoushuaifeng
> Priority: Minor
>
> We have test a cluster which have more than 30,000 regions, max size of a
> region is 512MB. At this situation, data no more growing, but remove some old
> data and insert new, and regions will be more and more. And some regions may
> be very small or empty. This occupies too much heapsize, and will be more if
> regions cannot be merged. This will limit hbase running for a long time.
> A script that does a survey to remove empty regions, or pick out adjacent
> small regions that then does the online merge up seems like it would be
> useful.
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