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From "Billy Pearson (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-812) Compaction needs little better skip algo
Date Sun, 10 Aug 2008 15:09:44 GMT
Compaction needs little better skip algo

                 Key: HBASE-812
                 URL: https://issues.apache.org/jira/browse/HBASE-812
             Project: Hadoop HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.2.0, 0.3.0
            Reporter: Billy Pearson
            Priority: Trivial
             Fix For: 0.2.1, 0.3.0

Looking at this section of one of my compaction's we have 3 files to compact the new algo
is working great in my test but I see this below often we are skipping 2 out of the 3 files
and compacting 1 file. 1 file is kind of a wast might as well just copy the file my suggestion
is if there is only 1 file left after the new algo skips then just go on to the next column
and skip the last file also. This will help improve compaction times a little more. 

2008-08-10 10:00:45,310 DEBUG org.apache.hadoop.hbase.regionserver.HStore: Compaction size
of 1339600874/size: 4.6m, skipped 2, 4851776
2008-08-10 10:00:45,438 DEBUG org.apache.hadoop.hbase.regionserver.HStore: started compaction
of 1 files into /hbase/webdata/compaction.dir/1339600874/size/mapfiles/8653208152776334891
2008-08-10 10:00:46,838 DEBUG org.apache.hadoop.hbase.regionserver.HStore: moving /hbase/webdata/compaction.dir/1339600874/size/mapfiles/8653208152776334891
to /hbase/webdata/1339600874/size/mapfiles/7539342470259528578
2008-08-10 10:00:47,166 DEBUG org.apache.hadoop.hbase.regionserver.HStore: Completed compaction
of 1339600874/size store size is 4.6m

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