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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-812) Compaction needs little better skip algo
Date Mon, 11 Aug 2008 20:08:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621575#action_12621575
] 

stack commented on HBASE-812:
-----------------------------

Billy: If we're compacting a single file, thats just dumb and we need to fix it (Doesn't look
like the file we're compacting is a reference).  Do you have other examples?  Can you update
to later hbase too -- looks like you are on older stuff -- and if the problem still exists,
can you put in more examples?

> 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. 
> {code}
> 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
> {code}

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