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https://issues.apache.org/jira/browse/PDFBOX-5499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17607339#comment-17607339
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ASF subversion and git services commented on PDFBOX-5499:
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Commit 1904176 from Tilman Hausherr in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1904176 ]
PDFBOX-5499: fix typo
> 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: 2.0.19
> Reporter: Thomas Debray Luyat
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.27, 3.0.0 PDFBox
>
> Attachments: image-2022-09-05-12-48-04-608.png,
> image-2022-09-05-17-37-55-155.png, image-2022-09-05-17-40-22-416.png,
> image-2022-09-05-19-55-40-753.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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