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https://issues.apache.org/jira/browse/HBASE-11861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14280023#comment-14280023
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Jingcheng Du commented on HBASE-11861:
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Currently we choose the compaction approach that is out of region and have del 
files with only delete markers. Thanks.

> Native MOB Compaction mechanisms.
> ---------------------------------
>
>                 Key: HBASE-11861
>                 URL: https://issues.apache.org/jira/browse/HBASE-11861
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver, Scanners
>    Affects Versions: 2.0.0
>            Reporter: Jonathan Hsieh
>         Attachments: 141030-mob-compaction.pdf, HBASE-11861.diff, mob 
> compaction-out-of-region.pdf, mob compaction.pdf
>
>
> Currently, the first cut of mob will have external processes to age off old 
> mob data (the ttl cleaner), and to compact away deleted or over written data 
> (the sweep tool).  
> From an operational point of view, having two external tools, especially one 
> that relies on MapReduce is undesirable.  In this issue we'll tackle 
> integrating these into hbase without requiring external processes.



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