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https://issues.apache.org/jira/browse/HBASE-7519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13556939#comment-13556939
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Matteo Bertozzi commented on HBASE-7519:
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Why you need a different file structure? you just need a meta field associated
with the file that says "I'm in level X". All the files are already in memory
with trailer and other metadata information.
One "problem" with the LevelDB algorithm is that if the set of keys are
monotonically increasing (no overlaps between files) you end up with lots and
lots of files, and at region server startup the RS can run out of fds
> 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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