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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17172) Optimize major mob compaction with _del files
Date Tue, 29 Nov 2016 02:10:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15703892#comment-15703892
] 

Jingcheng Du commented on HBASE-17172:
--------------------------------------

Thanks [~huaxiang] and [~anoopsamjohn].
bq. Means the deleted MOB cells will be there in MOB files unless they are TTL expired?
Right. But according to Huaxiang's comments, this is not doable.

So it seems merging files by regions is the only way now.

> 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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