Solr
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Solr is a fulltext search engine based on Lucene that provides fast indexing and retrieval. It has features like distributed search, faceting, highlighting, autocomplete, and extensibility through plugins. Documents are indexed in fields that can be configured and queried using syntax like wildcards, ranges, and proximity searches. Solr allows multiple cores and dynamic fields for flexibility.
![Query Syntax
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name:(Ivo)
name:(+Ivo +Lasek)
name:(+Ivo -Lasek) AND age:[* TO 30]
name:(“Ivo Lasek”)
description:("more traffic between solr" ~2)
title:foo*
timestamp:[* TO NOW]](https://image.slidesharecdn.com/solr-131107045538-phpapp01/85/Solr-6-320.jpg)
![Faceted Search
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&q=*:*&facet=true&facet.field=cat
&q=ipod&facet=true&facet.query=price:[0 TO
100]&facet.query=price:[100 TO *]](https://image.slidesharecdn.com/solr-131107045538-phpapp01/85/Solr-13-320.jpg)
Solr
- 2. What is Solr? • • • • • • Fulltext Search Index Based on Lucene Fast Indexing Fast Retrieval Wide Range of Features Extendibility
- 3. Features • • • • • Distributed search Function queries Highlighting Faceted search Autocomplete
- 5. Solr Queries • http://localhost:8983/solr/select/?in dent=on&q=video&fl=name,id • http://localhost:8983/solr/select/?in dent=on&q=video&sort=price%20de sc&fl=name,id,price
- 6. Query Syntax • • • • • • • name:(Ivo) name:(+Ivo +Lasek) name:(+Ivo -Lasek) AND age:[* TO 30] name:(“Ivo Lasek”) description:("more traffic between solr" ~2) title:foo* timestamp:[* TO NOW]
- 7. Solr Documents – Index Structure <fields> <field name="id" type="string" indexed="true" stored="true" required="true" /> <field name="name" type="textgen" indexed="true" stored="true"/> ... </fields>
- 8. 547 <fieldType name="text_general_rev" class="solr.TextField" positionIncrementGap="100"> 548 <analyzer type="index"> 549 <tokenizer class="solr.StandardTokenizerFactory"/> 550 <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" /> 551 <filter class="solr.LowerCaseFilterFactory"/> 552 <filter class="solr.ReversedWildcardFilterFactory" withOriginal="true" 553 maxPosAsterisk="3" maxPosQuestion="2" maxFractionAsterisk="0.33"/> 554 </analyzer> 555 <analyzer type="query"> 556 <tokenizer class="solr.StandardTokenizerFactory"/> 557 <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="true"/> 558 <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" /> 559 <filter class="solr.LowerCaseFilterFactory"/> 560 </analyzer> 561 </fieldType>
- 9. Multiple Cores • One core vs. multiple cores – Instantiating cores (config files, solr.xml) • Data loading – Insert/Update – Commit – Optimize • Switching cores
- 11. Plugins Request Processing SolrRequestHandlerą SearchComponent QParserPlugin ValueSourceParser Highlighting SolrFragmenter SolrFormatter UpdateRequestProcessorFactory QueryResponseWriter Similarity CacheRegenerator Fields Analyzer Tokenizer and TokenFilter FieldType Internals SolrCache SolrEventListener UpdateHandler
- 12. Dismax Search • qf – Query fields qf="fieldOne^2.3 fieldTwo fieldThree^0.4” • mm – Minimum should match 3<90% • bf – boost Functions recip(rord(myfield),1,2,3)^1.5 http://wiki.apache.org/solr/DisMax