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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (Jira)" <ji...@apache.org> on 2022/09/05 11:22:00 UTC
[jira] [Commented] (PDFBOX-5499) Performance issue since 2.0.18
[ https://issues.apache.org/jira/browse/PDFBOX-5499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17600333#comment-17600333 ]
Tilman Hausherr commented on PDFBOX-5499:
-----------------------------------------
Can you share the PDF?
> Performance issue since 2.0.18
> ------------------------------
>
> Key: PDFBOX-5499
> URL: https://issues.apache.org/jira/browse/PDFBOX-5499
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.18
> Reporter: Thomas Debray Luyat
> Priority: Major
> Attachments: image-2022-09-05-12-48-04-608.png
>
>
> Our PDF is parsed in less than 200ms in 2.0.18 and more then 8 seconds in 2.0.19. The same issue is still there in 2.0.26.
>
> In version 2.0.19, SmallMap has been introduced. We're facing a performance issue since this modification.
> !image-2022-09-05-12-48-04-608.png|width=968,height=377!
> We patch our code to just replace the SmallMap implementation like this:
> {code:java}
> package org.apache.pdfbox.util;
> import java.util.LinkedHashMap;
> public class SmallMap<K, V> extends LinkedHashMap<K, V> {
> // nothing : use the standard LinkedHashMap
> }{code}
> And the performance issue disappear.
> Our test is really simple:
> {code:java}
> long start = System.currentTimeMillis();
> try (PDDocument document = PDDocument.load(new File(inFile))) {
> // nothing : only parsing is evaluated
> }
> long duration = System.currentTimeMillis() -start;
> assertTrue(duration < 500);{code}
>
> I can understand that the SmallMap can solve issues in some cases, but it is possible to implement a factory to create this map and then allow to setup which Map implementation we want to use?
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