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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2008/08/11 22:08:44 UTC
[jira] Commented: (HBASE-812) Compaction needs little better skip
algo
[ 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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