Solr 使用Carrot2完成了聚类功能,能够把检索到的内容自动分类, Carrot2聚类示例:
要想Solr支持聚类功能,首选要把Solr发行包的中的dist/ solr-clustering-4.2.0.jar, 复制到\solr\contrib\analysis-extras\lib下.然后打开solrconfig.xml进行添加配置:
<searchComponent name="clustering" enable="${solr.clustering.enabled:true}" class="solr.clustering.ClusteringComponent" > <lst name="engine"> <str name="name">default</str> <str name="carrot.algorithm">org.carrot2.clustering. lingo.LingoClusteringAlgorithm</str> <str name="LingoClusteringAlgorithm.desiredClusterCountBase">20</str> </lst> </searchComponent>配好了聚类组件后,下面配置requestHandler:
<requestHandler name="/clustering" startup="lazy" enable="${solr.clustering.enabled:true}" class="solr.SearchHandler"> <lst name="defaults"> <str name="echoParams">explicit</str> <bool name="clustering">true</bool> <str name="clustering.engine">default</str> <bool name="clustering.results">true</bool> <str name="carrot.title">category_s</str> <str name="carrot.snippet">content</str> </lst> <arr name="last-components"> <str>clustering</str> </arr> </requestHandler>有两个参数要注意carrot.title, carrot.snippet是聚类的比较计算字段,这两个参数必须是stored=”true”.carrot.title的权重要高于carrot.snippet,如果只有一个做计算的字段carrot.snippet可以去掉(是去掉不是值为空).设完了用下面的URL就可以查询了 http://localhost:8983/skyCore/clustering?q=:&wt=xml&indent=true
