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From "Nick Burch (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TIKA-1568) AutoDetectReader performance problem
Date Mon, 09 Mar 2015 17:24:38 GMT

    [ https://issues.apache.org/jira/browse/TIKA-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14353224#comment-14353224

Nick Burch commented on TIKA-1568:

Maybe we could look at putting the EncodingDetector on the TikaConfig object? Perhaps indirectly?
It could potentially work like DefaultParser / DefaultDetector does, where in the default
case it finds suitable classes only once, but can handle dynamic loading as well

I'm not sure about having the parsers cache the EncodingDetector - I'm not sure we've got
anything like that happening anywhere currently, do we?

> AutoDetectReader performance problem
> ------------------------------------
>                 Key: TIKA-1568
>                 URL: https://issues.apache.org/jira/browse/TIKA-1568
>             Project: Tika
>          Issue Type: Bug
>    Affects Versions: 1.7
>            Reporter: Andrzej Bialecki 
> Parsing performance of many text files suffers from repeated calls to ServiceLoader.loadServiceProviders(EncodingDetector.class).
This happens in TXTParser, HTMLParser and SourceCodeParser. In most cases, when Tika is using
the default ServiceLoader instance created in the Parser's static section this cost can be
avoided by caching the resulting List<EncodingDetector> either at a higher level in
the Parser (as a static property). If using custom ServiceLoader-s this can be achieved by
putting this list in ParsingContext, or caching these lists at a lower level in the ServiceLoader
> Relevant part of  the stacktrace follows:
> {code}
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at java.util.zip.ZipFile.getEntry(ZipFile.java:304)
> 	- locked <0x00000007909d2e48> (a java.util.jar.JarFile)
> 	at java.util.jar.JarFile.getEntry(JarFile.java:227)
> 	at java.util.jar.JarFile.getJarEntry(JarFile.java:210)
> 	at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:840)
> 	at sun.misc.URLClassPath$JarLoader.findResource(URLClassPath.java:818)
> 	at sun.misc.URLClassPath$1.next(URLClassPath.java:226)
> 	at sun.misc.URLClassPath$1.hasMoreElements(URLClassPath.java:236)
> 	at java.net.URLClassLoader$3$1.run(URLClassLoader.java:583)
> 	at java.net.URLClassLoader$3$1.run(URLClassLoader.java:581)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at java.net.URLClassLoader$3.next(URLClassLoader.java:580)
> 	at java.net.URLClassLoader$3.hasMoreElements(URLClassLoader.java:605)
> 	at java.util.Collections.list(Collections.java:3687)
> 	at org.eclipse.jetty.webapp.WebAppClassLoader.toList(WebAppClassLoader.java:337)
> 	at org.eclipse.jetty.webapp.WebAppClassLoader.getResources(WebAppClassLoader.java:321)
> 	at org.apache.tika.config.ServiceLoader.findServiceResources(ServiceLoader.java:210)
> 	at org.apache.tika.config.ServiceLoader.identifyStaticServiceProviders(ServiceLoader.java:277)
> 	at org.apache.tika.config.ServiceLoader.loadStaticServiceProviders(ServiceLoader.java:306)
> 	at org.apache.tika.config.ServiceLoader.loadServiceProviders(ServiceLoader.java:228)
> 	at org.apache.tika.detect.AutoDetectReader.<init>(AutoDetectReader.java:104)
> 	at org.apache.tika.parser.txt.TXTParser.parse(TXTParser.java:70)
> 	at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:244)
> 	at org.apache.tika.parser.ParserDecorator.parse(ParserDecorator.java:91)
> ...
> {code}

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