多核心的重点在于solr.xml配置，还有更新，查询时必须指定相应的核心名字：
如下配置２个核心，核心目录是solr.home/news,solr.home/apps
<cores adminPath="/admin/cores"> <core name="news" instanceDir="news" /> <core name="apps" instanceDir="apps" /> </cores>
配置文件和索引目录都在instanceDir下,我的solr家目录是/usr/local/solr/配置后 ，确保每个核心data目录tomcat有权限操作：
[root@localhost solr]# ls -lothr -rw-r--r-- 1 tomcat 7.3M Nov 7 15:34 solr.war drwxr-xr-x 4 tomcat 4.0K Dec 8 11:46 news drwxr-xr-x 4 tomcat 4.0K Dec 8 11:46 apps -rw-r--r-- 1 tomcat 1.3K Dec 8 11:55 solr.xml
[root@localhost solr]# ls -lothr news/ total 8.0K drwxr-xr-x 3 tomcat 4.0K Dec 8 11:46 data drwxr-xr-x 2 tomcat 4.0K Dec 8 13:41 conf
最近研究solr
solrconfig.xml配置：
<config>
<luceneMatchVersion>LUCENE_x</luceneMatchVersion>
<!-- The DirectoryFactory to use for indexes.
solr.StandardDirectoryFactory, the default, is filesystem based.
solr.RAMDirectoryFactory is memory based, not persistent, and doesn't work with replication. -->
<directoryFactory name="DirectoryFactory" class="${solr.directoryFactory:solr.StandardDirectoryFactory}"/>
<lib dir="../../dist/" />
<updateHandler class="solr.DirectUpdateHandler2" />
<requestDispatcher handleSelect="true" >
<requestParsers enableRemoteStreaming="false" multipartUploadLimitInKB="2048" />
</requestDispatcher>
<requestHandler name="standard" class="solr.StandardRequestHandler" default="true" />
<requestHandler name="/update" class="solr.XmlUpdateRequestHandler" />
<requestHandler name="/admin/" class="org.apache.solr.handler.admin.AdminHandlers" />
<requestHandler name="/dataimport" class="org.apache.solr.handler.dataimport.DataImportHandler">
<lst name="defaults">
<str name="config">dataConfig.xml</str>
</lst>
</requestHandler>
<!-- config for the admin interface -->
<admin>
<defaultQuery>*:*</defaultQuery>
</admin>
</config>
solr.xml配置：
<solr persistent="false">
<!--
adminPath: RequestHandler path to manage cores.
If 'null' (or absent), cores will not be manageable via request handler
-->
<cores adminPath="/admin/cores">
<core name="" instanceDir="c0" />
<core name="" instanceDir="c1" />
</cores>
</solr>