dadoonet / fscrawler

Elasticsearch File System Crawler (FS Crawler)
https://fscrawler.readthedocs.io/
Apache License 2.0
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Duplication of PDF content #1097

Open albinantonya2 opened 3 years ago

albinantonya2 commented 3 years ago

I've tried to upload a simple pdf using fscrawler REST document upload API. It successfully converted pdf contents into plain text and indexed it in Elasticsearch. But when I checked the converted text in the API's response I found duplication of content. The content of pdf is getting duplicated 3 times if OCR is enabled and 2 times if OCR is disabled

I'm using docker-compose to run fscrawler from this repo

dadoonet commented 3 years ago

Could you please share the pdf document?

albinantonya2 commented 3 years ago

Its actually happening with every pdf file I uploaded. I'm attaching one of the pdf file dummy1.pdf

albinantonya2 commented 3 years ago

@dadoonet Hi any updates on this.?

dadoonet commented 3 years ago

No sorry. 😔 I don't have free time at the moment to work on FSCrawler. I expect to work again on it in March when the Elastic Community Conference is over 😉.

albinantonya2 commented 3 years ago

@dadoonet Any chance you fixed this bug.? We are planning to move to other libraries to convert pdf to text because of this issue.

dadoonet commented 3 years ago

Interesting. I tested this document today and indeed the extracted content by Tika is:

\nDummy PDF file\n\nDummy PDF file\n\n\n\tDummy PDF file\n\n

Could you share the OpenOffice.org 2.1 source document?

dadoonet commented 3 years ago

I'm wondering if the content generated by OpenOffice is not the problem here...

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<</Title<FEFF00440075006D006D00790020005000440046002000660069006C0065>
/Dest[1 0 R/XYZ 56.7 773.3 0]/Parent 12 0 R>>
endobj

4 0 obj
<</Type/Pages
/Resources 11 0 R
/MediaBox[ 0 0 595 842 ]
/Kids[ 1 0 R ]
/Count 1>>
endobj

14 0 obj
<</Type/Catalog/Pages 4 0 R
/Outlines 12 0 R
>>
endobj

15 0 obj
<</Author<FEFF004500760061006E00670065006C006F007300200056006C006100630068006F006700690061006E006E00690073>
/Creator<FEFF005700720069007400650072>
/Producer<FEFF004F00700065006E004F00660066006900630065002E006F0072006700200032002E0031>
/CreationDate(D:20070223175637+02'00')>>
endobj

xref
0 16
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trailer
<</Size 16/Root 14 0 R
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%%EOF

Although some other tools seem to parse it correctly. (http://pdf-analyser.edpsciences.org/result/a9f723c3)

image

FWIW this "issue" is not coming from FSCrawler but from Tika (and probably from PDFBox).

dadoonet commented 3 years ago

Interesting. PDFBox gives the right output.

wget https://downloads.apache.org/pdfbox/2.0.23/pdfbox-app-2.0.23.jar
java -jar pdfbox-app-2.0.23.jar ExtractText -console issue-1097.pdf

gives:

Dummy PDF file

Digging more...

dadoonet commented 3 years ago

Tested with Tika

wget https://downloads.apache.org/tika/tika-app-1.26.jar
java -jar tika-app-1.26.jar

When I upload the test file, I can see that the text is extracted twice.

<?xml version="1.0" encoding="UTF-8"?><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="pdf:PDFVersion" content="1.4"/>
<meta name="xmp:CreatorTool" content="Writer"/>
<meta name="pdf:hasXFA" content="false"/>
<meta name="access_permission:modify_annotations" content="true"/>
<meta name="access_permission:can_print_degraded" content="true"/>
<meta name="dc:creator" content="Evangelos Vlachogiannis"/>
<meta name="dcterms:created" content="2007-02-23T15:56:37Z"/>
<meta name="dc:format" content="application/pdf; version=1.4"/>
<meta name="pdf:docinfo:creator_tool" content="Writer"/>
<meta name="access_permission:fill_in_form" content="true"/>
<meta name="pdf:encrypted" content="false"/>
<meta name="Content-Length" content="13264"/>
<meta name="X-TIKA:digest:MD5" content="2942bfabb3d05332b66eb128e0842cff"/>
<meta name="pdf:hasMarkedContent" content="false"/>
<meta name="Content-Type" content="application/pdf"/>
<meta name="pdf:docinfo:creator" content="Evangelos Vlachogiannis"/>
<meta name="X-Parsed-By" content="org.apache.tika.parser.DefaultParser"/>
<meta name="X-Parsed-By" content="org.apache.tika.parser.pdf.PDFParser"/>
<meta name="creator" content="Evangelos Vlachogiannis"/>
<meta name="meta:author" content="Evangelos Vlachogiannis"/>
<meta name="meta:creation-date" content="2007-02-23T15:56:37Z"/>
<meta name="created" content="2007-02-23T15:56:37Z"/>
<meta name="X-TIKA:digest:SHA256" content="3df79d34abbca99308e79cb94461c1893582604d68329a41fd4bec1885e6adb4"/>
<meta name="access_permission:extract_for_accessibility" content="true"/>
<meta name="access_permission:assemble_document" content="true"/>
<meta name="xmpTPg:NPages" content="1"/>
<meta name="Creation-Date" content="2007-02-23T15:56:37Z"/>
<meta name="resourceName" content="issue-1097.pdf"/>
<meta name="pdf:hasXMP" content="false"/>
<meta name="access_permission:extract_content" content="true"/>
<meta name="access_permission:can_print" content="true"/>
<meta name="Author" content="Evangelos Vlachogiannis"/>
<meta name="producer" content="OpenOffice.org 2.1"/>
<meta name="access_permission:can_modify" content="true"/>
<meta name="pdf:docinfo:producer" content="OpenOffice.org 2.1"/>
<meta name="pdf:docinfo:created" content="2007-02-23T15:56:37Z"/>
<title/>
</head>
<body><div class="page"><p/>
<p>Dummy PDF file</p>
<p/>
</div>
<ul>    <li>Dummy PDF file</li>
</ul>
</body></html>

image

So it looks definitely a Tika issue. I opened TIKA-3364.

dadoonet commented 3 years ago

Reopening