sam marshall created SOLR-15039:
-----------------------------------
Summary: Error in Solr Cell extract when using multipart upload
with some documents
Key: SOLR-15039
URL: https://issues.apache.org/jira/browse/SOLR-15039
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: contrib - Solr Cell (Tika extraction)
Affects Versions: 8.7, 8.6.3, 8.4, 6.6.4
Reporter: sam marshall
(Note: I asked about this in the IRC channel as prompted, but didn't get a
response.)
When uploading particular documents to /update/extract, you get different
(wrong) results if you are using multipart file upload compared to the basic
encoded upload, even though both methods are shown on the documentation page
([https://lucene.apache.org/solr/guide/8_7/uploading-data-with-solr-cell-using-apache-tika.html]).
The first example in the documentation page uses a multipart POST with a field
called 'myfile' set to the file content. Some later examples use a standard
POST with the raw data provided.
Here are these two approaches in the commands I used with my example file (I
have replaced the URL, username, password, and collection name for my Solr,
which isn't publicly available):
{code}
curl --user myuser:mypassword
"https://example.org/solr/mycollection/update/extract?&extractOnly=true";
--data-binary '@c:/temp/b364b24b728b350eac18d6379ede3437fd220829' -H
'Content-type:text/html' > nonmultipart-result.txt
curl --user myuser:mypassword
"https://example.org/solr/mycollection/update/extract?&extractOnly=true"; -F
'myfile=@c:/temp/b364b24b728b350
eac18d6379ede3437fd220829' -H 'Content-type:text/html' > multipart-result.txt
{code}
The example file is a ~10MB PowerPoint with a few sentences of English text in
it (and some pictures).
The nonmultipart-result.txt file is 9,871 bytes long and JSON-encoded; it
includes an XHTML version of the text content of the PowerPoint, and some
metadata.
The multipart-result.txt is 7,352,348 bytes long and contains mainly a large
sequence of Chinese characters, or at least, random data being interpreted as
Chinese characters.
This example was running against Solr 8.4 on a Linux server from our cloud Solr
supplier. On another Linux (Ubuntu 18) server that I set up myself I got the
same results using various other Solr versions. Running against localhost which
is a Windows 10 machine with Solr 8.5, I get slightly different results; the
non-multipart works correctly but the multipart-result.txt in that case is a
slightly more helpful error 500 message:
{code}
<?xml version="1.0" encoding="UTF-8"?>
<response>
<lst name="responseHeader">
<int name="status">500</int>
<int name="QTime">138</int>
</lst>
<lst name="error">
<lst name="metadata">
<str name="error-class">org.apache.solr.common.SolrException</str>
<str name="root-error-class">java.util.zip.ZipException</str>
</lst>
<str name="msg">org.apache.tika.exception.TikaException: Error creating OOXML
extractor</str>
<str name="trace">org.apache.solr.common.SolrException:
org.apache.tika.exception.TikaException: Error creating OOXML extractor
...
Caused by: java.util.zip.ZipException: Unexpected record signature: 0X2D2D2D2D
at
org.apache.commons.compress.archivers.zip.ZipArchiveInputStream.getNextZipEntry(ZipArchiveInputStream.java:260)
{code}
My conclusion is that even though both versions of this command (-F
myfile=@file, and --data-binary @file) are shown in the documentation, they
clearly don't work equally.
Note: Although I've reproduced this using command-line curl to simplify this
report, this is actually the result of a highly tortuous debugging process
where I eventually managed to track down why a search index (generated by an
open source learning system, Moodle, which currently uses the multipart post
approach although I might have to change that) was using up too much disk
space...
I'm going to try to remove private data from the offending file and attach it
here.
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