Thomas Debray Luyat created PDFBOX-5499:
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Summary: Performance issue since 2.0.28
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
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=1115,height=434!
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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