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https://issues.apache.org/jira/browse/HBASE-7630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561841#comment-13561841
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Sergey Shelukhin commented on HBASE-7630:
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My main goal would be improving compactions (but this can be achieved with 
certain level-like compaction algorithm, call it stripe-compactions :)), and 
improving failover (where there are many small regions, it's easier to shuffle 
them and preserve both locality and balance of data size between servers).
Also good for reads, yes.
                
> support large number of small regions
> -------------------------------------
>
>                 Key: HBASE-7630
>                 URL: https://issues.apache.org/jira/browse/HBASE-7630
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Sergey Shelukhin
>
> Supporting large number of small regions can help improve scalability in 
> terms of number of tables/cfs/etc., help speed up recovery, and also lessen 
> the impact of compactions (due to there being a large number of small 
> compactions). 
> This is an issue to attempt brainstorming current limitations.
> We might want to take this into consideration when designing master tasks 
> such as in HBASE-5487.

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