[SOLR-2891] InvalidTokenOffsetsException when using MappingCharFilterFactory, DictionaryCompoundWordTokenFilterFactory and Highlighting

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.1, 3.4
• Fix Version/s: 3.6, 4.0-ALPHA
• Component/s: highlighter, Schema and Analysis, search

Environment

MacOS X, Java 1.6, Tomcat 7

• Assignee: Robert Muir
• Reporter: Edwin Steiner
• Created: 11/Nov/11 07:46
• Updated: 10/May/13 10:39
• Resolved: 22/Jan/12 16:49

Description

I would like to handle german accents (Umlaute) by replacing the accented char with its two-letter substitute (e.g ä => ae). For this reason I use the char-filter solr.MappingCharFilterFactory configured with a mapping file containing entries like "ä" => "ae". I also want to use the solr.DictionaryCompoundWordTokenFilterFactory to find words which are part of compound words (e.g. revision in totalrevision). And finally I want to use Solr highlighting. But there seems to be a problem if I combine the char filter and the compound word filter in combination with highlighting (an org.apache.lucene.search.highlight.InvalidTokenOffsetsException is raised).

Here are the details:

types:
--------
<fieldType name="textAnalyzedFailed" class="solr.TextField" positionIncrementGap="100">
<analyzer>
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping.txt"/>
<tokenizer class="solr.WhitespaceTokenizerFactory"/>
<filter class="solr.DictionaryCompoundWordTokenFilterFactory" dictionary="words.txt"/>
</analyzer>
</fieldType>

schema:
-----------
<fields>
<field name="id" type="string" indexed="true" stored="true" required="true" />
<field name="title" type="textAnalyzedFailed" indexed="true" stored="true"/>
</fields>

document:
--------------
<doc>
<field name="id">1</field>
<field name="title">banküberfall</field>
</doc>

mapping.txt:
-----------------
"ü" => "ue"

words.txt:
--------------
fall

The resulting error when search with:

http://localhost:8080/solr/select/?q=banküberfall&hl=true&hl.fl=title

Nov 4, 2011 4:29:12 PM org.apache.solr.core.SolrCore execute
INFO: [] webapp=/solr path=/select/ params=

{q=bank?berfall&hl.fl=title_hl&hl=true}

hits=1 status=0 QTime=13
Nov 4, 2011 4:29:16 PM org.apache.solr.common.SolrException log
SEVERE: org.apache.solr.common.SolrException: org.apache.lucene.search.highlight.InvalidTokenOffsetsException: Token fall exceeds length of provided text sized 12
at org.apache.solr.highlight.DefaultSolrHighlighter.doHighlightingByHighlighter(DefaultSolrHighlighter.java:469)
at org.apache.solr.highlight.DefaultSolrHighlighter.doHighlighting(DefaultSolrHighlighter.java:378)
at org.apache.solr.handler.component.HighlightComponent.process(HighlightComponent.java:116)
at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:194)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1360)
at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:356)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:252)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:851)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:278)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Caused by: org.apache.lucene.search.highlight.InvalidTokenOffsetsException: Token fall exceeds length of provided text sized 12
at org.apache.lucene.search.highlight.Highlighter.getBestTextFragments(Highlighter.java:228)
at org.apache.solr.highlight.DefaultSolrHighlighter.doHighlightingByHighlighter(DefaultSolrHighlighter.java:462)
... 23 more

The analysis tool says the following for field name=title, field value=banküberfall:
------------------------------------------------------------------------------------
Index Analyzer
org.apache.solr.analysis.MappingCharFilterFactory

{mapping=mapping.txt, luceneMatchVersion=LUCENE_31}

text bankueberfall
org.apache.solr.analysis.WhitespaceTokenizerFactory

{luceneMatchVersion=LUCENE_31}

position 1
term text bankueberfall
startOffset 0
endOffset 12
org.apache.solr.analysis.DictionaryCompoundWordTokenFilterFactory

{dictionary=words.txt, luceneMatchVersion=LUCENE_31}

position 1
term text bankueberfall
fall
startOffset 0
9
endOffset 12
13
flags 0
0
type word
word
payload