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From "Henryk Paluch (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-1997) Performance fix, when deserializing large jcr:binary in ValueHelper.deserialize()
Date Wed, 25 Feb 2009 10:11:05 GMT
Performance fix, when deserializing large jcr:binary in ValueHelper.deserialize()
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                 Key: JCR-1997
                 URL: https://issues.apache.org/jira/browse/JCR-1997
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-jcr-commons
    Affects Versions: 1.4
         Environment: Win 2000
            Reporter: Henryk Paluch
            Priority: Trivial


While profiling import of large PDF files into Magnolia 3.6.3 (which uses Jackrabbit 1.4 as
JCR repository) we had found that there is large CPU time spent on:

"http-8080-4" daemon prio=6 tid=0x5569fc00 nid=0x6ec runnable [0x5712d000..0x5712fb14]
   java.lang.Thread.State: RUNNABLE
	at java.io.FileOutputStream.writeBytes(Native Method)
	at java.io.FileOutputStream.write(FileOutputStream.java:260)
	at org.apache.jackrabbit.util.Base64.decode(Base64.java:269)
	at org.apache.jackrabbit.util.Base64.decode(Base64.java:184)
	at org.apache.jackrabbit.value.ValueHelper.deserialize(ValueHelper.java:759)
	at org.apache.jackrabbit.core.xml.BufferedStringValue.getValue(BufferedStringValue.java:258)
	at org.apache.jackrabbit.core.xml.PropInfo.apply(PropInfo.java:132)

Looking into source code of Base64.decode it became obvious, that it writes each 1to3byte
chunk into unbuffered FileOutputStream (thus calling OS kernel many times to write just few
bytes) which causes lot of CPU usage without disk usage.


Provided fix is quite trivial - just wrap FileOutputStream into BufferedOutputStream.


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