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https://issues.apache.org/jira/browse/PDFBOX-4475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16779497#comment-16779497
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Tilman Hausherr commented on PDFBOX-4475:
-----------------------------------------
Thanks, your screenshot points to a problem:
{{clonedVersion.containsValue(base)}} is slow, the javadoc tells that _This
operation will probably require time linear in the map size for most
implementations of the Map interface_. I have fixed that. This is too late for
the 2.0.14, but you can copy the source code of the merge and the clone class
and keep these separate until 2.0.15.
The target file is still very large, this is because we don't support
compressed object streams. If this is important for you, then postprocess your
file with a utility like qpdf.
Do you need the structure tree? If not, then you can remove it. This is for
tagged PDFs. The cloning of the structure tree was introduced because people
were unhappy that after merging, one couldn't close the source file (because
the destination file was referencing source streams).
You can't remove the "Don't clone a clone" segment. 7 build tests will fail:
the final PDF ends up with pages that are not in the page tree, these are pages
that were cloned twice or even more. This results in larger files and potential
mayhem.
> PDFMergerUtility is very slow, almost in dead loop
> --------------------------------------------------
>
> Key: PDFBOX-4475
> URL: https://issues.apache.org/jira/browse/PDFBOX-4475
> Project: PDFBox
> Issue Type: Bug
> Reporter: Derek Liu
> Priority: Critical
> Attachments: TourInventory_TourInventory_report.pdf,
> image-2019-02-27-15-43-42-304.png, screenshot-1.png
>
>
> When use PDFMergerUtility to merge PDF file, it is very slow to merge the
> struct tree. It seems that it in a dead loop.
> !image-2019-02-27-15-43-42-304.png!
> Test code:
> {code}
> package com.test;
> import java.io.IOException;
> import org.apache.pdfbox.multipdf.PDFMergerUtility;
> public class TestMergeUtil {
> public static void main( String[] args ) throws IOException {
> PDFMergerUtility merger = new PDFMergerUtility();
> merger.addSource( "D:\\probe\\TourInventory_TourInventory_report.PDF" );
> merger.addSource( "D:\\probe\\TourInventory_TourInventory_report.PDF" );
> merger.setDestinationFileName(
> "D:\\probe\\TourInventory_TourInventory_report_merged.pdf" );
> merger.mergeDocuments();
> }
> }
> {code}
> But after I comment bellow code, it can merge fast, but the merged PDF file
> size is very large.
> !screenshot-1.png!
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