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https://issues.apache.org/jira/browse/HBASE-17172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15714293#comment-15714293
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Jingcheng Du commented on HBASE-17172:
--------------------------------------

bq. Can I create a new jira to address "Meanwhile, we can add more 
constriction, for example only perform compaction when there are more than 2 
mob files and _del files in minor compaction?"?
Sure, thanks!

> Optimize major mob compaction with _del files
> ---------------------------------------------
>
>                 Key: HBASE-17172
>                 URL: https://issues.apache.org/jira/browse/HBASE-17172
>             Project: HBase
>          Issue Type: Improvement
>          Components: mob
>    Affects Versions: 2.0.0
>            Reporter: huaxiang sun
>            Assignee: huaxiang sun
>
> Today, when there is a _del file in mobdir, with major mob compaction, every 
> mob file will be recompacted, this causes lots of IO and slow down major mob 
> compaction (may take months to finish). This needs to be improved. A few 
> ideas are: 
> 1) Do not compact all _del files into one, instead, compact them based on 
> groups with startKey as the key. Then use firstKey/startKey to make each mob 
> file to see if the _del file needs to be included for this partition.
> 2). Based on the timerange of the _del file, compaction for files after that 
> timerange does not need to include the _del file as these are newer files.



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