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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17172) Optimize major mob compaction with _del files
Date Fri, 02 Dec 2016 07:14:58 GMT

    [ 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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