I have to index a list of PDFs and for some of them there is no problem, but
for others when I look the indexed content I only see a lot of diamonds with a
question mark in it.
I think the problem is the font used for the document or that the content is
"encapsulated" into a picture.
Is there a way to tell tika to extract only the "readable/parsable" text of a
pdf?
When I query all the documents (with my java application) this is an ex. of
what I see in the logfile for the content of the problematic files:
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << "
[0xe8]?[0x1]d41d8cd98f00b204e9800998ecf8427e[0xb][0xa4][0xe5][0x81](Diverses[0xe6]=aabhpdtyan3vfsujquccemebqr4m3[0xe7][0x81]?[0xc1][0x4]
[\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " E-Mail zur Archivierung [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << "
[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0x9][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - <<
"[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0x9][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\r][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\r][\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << "
[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << "
[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - <<
"[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << "
[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0x9][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << "
[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0x9][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - <<
"[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\r][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\r][\n]">
DEBUG org.apache.http.wire - <<
"[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - <<
"[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - <<
"[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\r][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\r][\n]">
DEBUG org.apache.http.wire - <<
"[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << "
[0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][0xef][0xbf][0xbd][\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [0xef][0xbf][0xbd] [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [\n]">
DEBUG org.apache.http.wire - << " [0x9] data1.pdf [\n]">
Another problem is that for all the files (also the "good ones") at the
beginning of the content field there is a long list of `\n` as you can also see
above. How can avoid this?
Here is my schema.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<schema name="simple" version="1.1">
<types>
<fieldtype name="string" class="solr.StrField"
postingsFormat="SimpleText" />
<fieldtype name="ignored" class="solr.TextField"
/>
<fieldtype name="text" class="solr.TextField"
postingsFormat="SimpleText">
<analyzer>
<charFilter
class="solr.PatternReplaceCharFilterFactory" pattern="\n" replacement=""/>
<tokenizer
class="solr.StandardTokenizerFactory"/>
<filter
class="solr.LowerCaseFilterFactory" /> <!--Lowercases the letters in each
token. Leaves non-letter tokens alone.-->
<filter
class="solr.ClassicFilterFactory" /> <!--Removes dots from acronyms and 's from
the end of tokens. Works only on typed tokens produced by ClassicTokenizer or
equivalent.-->
<filter
class="solr.TrimFilterFactory"/> <!--Trims whitespace at either end of a token.
-->
<filter
class="solr.StopFilterFactory" ignoreCase="true"/> <!--Discards common words.
-->
<filter
class="solr.RemoveDuplicatesTokenFilterFactory"/>
</analyzer>
</fieldtype>
</types>
<fields>
<field name="signatureField" type="string"
indexed="true" stored="true" multiValued="false" />
<dynamicField name="ignored_*" type="ignored"
multiValued="true" indexed="false" stored="false" />
<field name="id" type="string" indexed="true"
stored="true" multiValued="false" />
<field name="rmDocumentTitle" type="string"
indexed="true" stored="true" multiValued="true"/>
<field name="fullText" indexed="true"
type="text" multiValued="true" />
</fields>
<defaultSearchField>fullText</defaultSearchField>
<solrQueryParser defaultOperator="OR" />
<uniqueKey>id</uniqueKey>
</schema>
and my solrconfig.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<config>
<luceneMatchVersion>LUCENE_45</luceneMatchVersion>
<directoryFactory name='DirectoryFactory'
class='solr.MMapDirectoryFactory' />
<codecFactory name="CodecFactory"
class="solr.SchemaCodecFactory" />
<lib dir='${solr.core.instanceDir}\lib' />
<lib dir="${solr.core.instanceDir}\dist\"
regex="solr-cell-\d.*\.jar" />
<lib dir="${solr.core.instanceDir}\contrib\extraction\lib"
regex=".*\.jar" />
<requestHandler name="standard"
class="solr.StandardRequestHandler" default="true" />
<requestHandler name="/update"
class="solr.UpdateRequestHandler">
<lst name="defaults">
<str
name="update.chain">deduplication</str>
</lst>
</requestHandler>
<requestHandler name="/update/extract"
class="solr.extraction.ExtractingRequestHandler">
<lst name="defaults">
<str
name="captureAttr">true</str>
<str
name="lowernames">false</str>
<str name="overwrite">false</str>
<str
name="captureAttr">true</str>
<str
name="literalsOverride">true</str>
<str
name="uprefix">ignored_</str>
<str name="fmap.a">link</str>
<str
name="fmap.content">fullText</str>
<!-- the configuration here
could be useful for tests -->
<str
name="update.chain">deduplication</str>
</lst>
</requestHandler>
<updateRequestProcessorChain name="deduplication">
<processor
class="org.apache.solr.update.processor.SignatureUpdateProcessorFactory">
<bool
name="overwriteDupes">false</bool>
<str
name="signatureField">signatureField</str>
<bool name="enabled">true</bool>
<str name="fields">content</str>
<str name="minTokenLen">10</str>
<str name="quantRate">.2</str>
<str
name="signatureClass">solr.update.processor.TextProfileSignature</str>
</processor>
<processor
class="solr.LogUpdateProcessorFactory" />
<processor
class="solr.RunUpdateProcessorFactory" />
</updateRequestProcessorChain>
<requestHandler name="/admin/"
class="org.apache.solr.handler.admin.AdminHandlers" />
<lockType>none</lockType>
<admin>
<defaultQuery>*:*</defaultQuery>
</admin>
</config>
