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https://issues.apache.org/jira/browse/HBASE-7519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13557418#comment-13557418
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Sergey Shelukhin commented on HBASE-7519:
-----------------------------------------
The tl;dr in the section about metadata explains it, the strict ordering of
files by seqnum is no longer possible; so if the default HBase store picks up
the files and sorts them by max seqnum, it will have incorrect results for
gets, and potentially other issues.
> Support level compaction
> ------------------------
>
> Key: HBASE-7519
> URL: https://issues.apache.org/jira/browse/HBASE-7519
> Project: HBase
> Issue Type: New Feature
> Components: Compaction
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Attachments: level-compaction.pdf, level-compactions-notes.txt
>
>
> The level compaction algorithm may help HBase for some use cases, for
> example, read heavy loads (especially, just one version is used), relative
> small key space updated frequently.
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