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From "huaxiang sun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17241) Avoid compacting already compacted mob files with _del files
Date Fri, 02 Dec 2016 15:04:58 GMT
huaxiang sun created HBASE-17241:

             Summary: Avoid compacting already compacted  mob files with _del files
                 Key: HBASE-17241
                 URL: https://issues.apache.org/jira/browse/HBASE-17241
             Project: HBase
          Issue Type: Improvement
          Components: mob
    Affects Versions: 2.0.0
            Reporter: huaxiang sun
            Assignee: huaxiang sun

Today if there is only one file in the partition, and there is no _del files, the file is
skipped. With del file, the current logic is to compact the already-compacted file with _del
file. Let's say there is one mob file regionA20161101***, which was compacted. On 12/1/2016,
there is _del file regionB20161201**_del, mob compaction kicks in, regionA20161101*** is less
than the threshold, and it is picked for compaction. Since there is a _del file, regionA20161101****
and regionB20161201***_del are compacted into regionA20161101**_1 . After that, regionB20161201**_del
cannot be deleted since it is not a allFile compaction. The next mob compaction, regionA20161101**_1
and regionB20161201**_del will be picked up again and be compacted into regionA20161101***_2.
So in this case, it will cause more unnecessary IOs.

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