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https://issues.apache.org/jira/browse/XERCESJ-1276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108416#comment-13108416
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Natan Cox edited comment on XERCESJ-1276 at 9/20/11 7:26 AM:
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I too had the same problem. The reason is that for comparison it loops over a
Vector.
I created a fix that improves performance from 5000s to 27s on my laptop for a
big file.
I have an xs:key constraint with 500.000 values.
Solution
* I added a fValueSet to do faster lookups.
* I filled and cleared everywhere where fValues is filled or cleared.
* And I added a "isContainsCandidate" check to rule out any candidates who do
not have all values in fValueSet.
* If we cannot rule out (which should be the exception) the main algorithm
kicks in again.
Note: I took 2.11.0 code as base!
And if formatting is not to Xerces-J standard: I sincerely apologize.
was (Author: natan.cox):
I too had the same problem. The reason is that for comparison it loops over
a Vector.
I created a fix that improves performance from 5000s to 27s on my laptop for a
big file.
I have xs:key constraint with 500.000 values.
Solution
* I added a fValueSet to do faster lookups.
* I filled and cleared everywhere where fValues is filled or cleared.
* And I added a "isContainsCandidate" check to rule out any candidates who do
not have all values in fValueSet.
* If we cannot rule out (which should be the exception) the main algorithm
kicks in again.
Note: I took 2.11.0 code as base!
And if formatting is not to Xerces-J standard: I sincerely apologize.
> XMLSchemaValidator$ValueStoreBase.contains() is painfully slow
> --------------------------------------------------------------
>
> Key: XERCESJ-1276
> URL: https://issues.apache.org/jira/browse/XERCESJ-1276
> Project: Xerces2-J
> Issue Type: Bug
> Components: XML Schema 1.0 Structures
> Affects Versions: 2.6.2, 2.9.1
> Reporter: Kenny MacLeod
> Attachments: XMLSchemaValidator.java
>
>
> Under certain conditions, the contains() method in
> XMLSchemaValidator$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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