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Date: Mon, 11 Oct 2010 20:21:32 -0400 (EDT)
From: "Kannan Muthukkaruppan (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Subject: [jira] Updated: (HBASE-3103) investigate/improve compaction
 performance
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     [ https://issues.apache.org/jira/browse/HBASE-3103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kannan Muthukkaruppan updated HBASE-3103:
-----------------------------------------

    Attachment: profiler_data.jpg

Find attached profiler screenshot.

Some highlights:

hfile.Compression$FinishOnFlushCompressionStream.write - 31%
StoreScanner.next - 28%  (HFile$Reader.decompression is 11% & ScanQueryMatcher.match - 8%)
ByteBloomFilter.add  - 20%
hfile.HFile$Writer.finishBlock - 4%


> investigate/improve compaction performance
> ------------------------------------------
>
>                 Key: HBASE-3103
>                 URL: https://issues.apache.org/jira/browse/HBASE-3103
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Kannan Muthukkaruppan
>         Attachments: profiler_data.jpg
>
>
> I was running some tests and am seeing that major compacting about 100M of data seems to take around 40-50 seconds. 
> My simplified test case is something like:
> * Created about a 100M store file (800M uncompressed).
> * 10k keys with 1k columns each (avg. key size: 30 bytes; avg. value size: 45 bytes) 
> * Compression and ROWCOL bloom was turned on.
> The test was to major compact this single store file into a new file.
> Added some nanoTime() calls around these three stages:
> * Scanner.next operations
> * bloom computation logic in: StoreFile:append()
> * StoreFile.Writer.append()
> This is what I saw for these three stages:
> {code}
> 2010-10-11 11:25:39,774 INFO org.apache.hadoop.hbase.regionserver.Store: major Compaction scanTime (ns)         4338103000
> 2010-10-11 11:25:39,774 INFO org.apache.hadoop.hbase.regionserver.Store: major Compaction bloom only time (ns) 14433821000
> 2010-10-11 11:25:39,774 INFO org.apache.hadoop.hbase.regionserver.Store: major Compaction append time (ns)     23191478000
> {code}
> The HFile.getReadTime() and HFile.getWriteTime() themselves seems pretty low (under 1 second levels). These are the times for the parts that interact with the DFS (readBlock() and finishBlock() mostly).
> Are these numbers roughly in line with what others are seeing normally? 
> Will double check my instrumentations, and try to get more data. Might try to run it under a profiler. But wanted to put it out there for additional input/ideas on improvement.

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