[jira] Commented: (PDFBOX-956) Poor text extraction performance in PDFTextStripper.java

["Mel Martinez (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991408#comment-12991408 ] 

Mel Martinez commented on PDFBOX-956:
-------------------------------------

Kevin,

I like the look of this optimization, though I haven't run it yet.

One comment:  The 52b22bd6.pdf file that you attached as a test case seems a bit problematic.  It apparently makes use of javascript.   For security reasons I normally run with javascript disabled on PDFs.   When I try to open this file with Adobe Reader from Firefox, it properly prompted me with whether to allow the javascript to run and before I could answer it hung up the Adobe Reader for about 90 seconds and then blew away both the Reader (v9.4.0) AND Firefox (v3.6.13).  This is on a 64bit Win XP Pro machine (latest patches as of a couple of days ago).

After restarting everything I tried once more (thinking maybe Firefox had gotten to a cluttered state) but it did it again right off the bat.

I'm not sure what happened at a micro level to cause that but I wonder if the file has some sort of corruption?


> Poor text extraction performance in PDFTextStripper.java
> --------------------------------------------------------
>
>                 Key: PDFBOX-956
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-956
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Text extraction
>    Affects Versions: 1.4.0
>            Reporter: Kevin Jackson
>             Fix For: 1.5.0
>
>         Attachments: 52b22bd6_69.pdf, PDFTextStripper.java.patch
>
>
> The worst case performance of the suppressDuplicateOverlappingText logic in processTextPosition is O(n^2).
> The patch is to use a TreeMap to achieve O(N log N) performance.
> The example PDF took over 2 hours to extract the text before this patch and less than 10 minute after.
> BTW:  The extracted text is also quite different compared to Adobe Reader.  Not sure which is correct but for this document it doesn't matter.

-- 
This message is automatically generated by JIRA.
-
For more information on JIRA, see: http://www.atlassian.com/software/jira