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Posted to j-dev@xerces.apache.org by "Michael Glavassevich (Updated) (JIRA)" <xe...@xml.apache.org> on 2012/03/11 01:32:56 UTC
[jira] [Updated] (XERCESJ-1276) Improve performance of XML Schema
Identity-constraint validation ---
XMLSchemaValidator$ValueStoreBase.contains() is painfully slow.
[ https://issues.apache.org/jira/browse/XERCESJ-1276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Glavassevich updated XERCESJ-1276:
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Summary: Improve performance of XML Schema Identity-constraint validation --- XMLSchemaValidator$ValueStoreBase.contains() is painfully slow. (was: XMLSchemaValidator$ValueStoreBase.contains() is painfully slow)
> Improve performance of XML Schema Identity-constraint validation --- XMLSchemaValidator$ValueStoreBase.contains() is painfully slow.
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: XERCESJ-1276
> URL: https://issues.apache.org/jira/browse/XERCESJ-1276
> Project: Xerces2-J
> Issue Type: Bug
> Components: XML Schema 1.0 Structures
> Affects Versions: 2.6.2, 2.9.1
> Reporter: Kenny MacLeod
> Labels: gsoc, gsoc2012
> Attachments: XMLSchemaValidator.java
>
>
> Under certain conditions, the contains() method in XMLSchemaValidator$ValueStoreBase can cripple the performance of parsing and validation.
> I'm not sure what those conditions are, but as a guideline figure I was using JAXB2 to deserialize a 22meg XML file. Without schema validation, it took 5 seconds. With validation, it took over 3 minutes (JDK 1.5.0_10 on win32). My profiler pointed the finger squarely at that method XMLSchemaValidator.
> Suspicions were aroused further when seeing this comment in the source:
> public boolean contains() {
> // REVISIT: we can improve performance by using hash codes, instead of
> // traversing global vector that could be quite large.
> This is present in Xerces 2.6.2 contained with JDK1.5.0_10, and also in the source for 2.9.1.
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