利用SOLR搭建企业搜索平台 之 MultiCore
1》找到solr下载包中的example文件夹，在它的下面有个multicore文件夹，将这个文件夹下面的所有东西copy到 c:\solr-tomcat\solr下面。
注意：有一个 solr.xml（这只是默认文件，当然也可以指定别的文件），如：
<?xml version="1.0" encoding="UTF-8" ?>
<solr persistent="false">
<cores adminPath="/admin/cores">
<core name="core0" instanceDir="core0" />
<core name="core1" instanceDir="core1" />
</cores>
</solr>
这个文件是告诉solr应该加载哪些core，cores里有 core0,core1。core0（可以类比以前的solr.home）/conf
目录下有schema.xml与solrconfig.xml，可以把实际应用的复制过来。现示例就用官方的了。
2》启动tomcat，访问应用，就可以看到有 Admin core0 和 Admin core1
3》采用上面的默认solr.xml，索引文件将存放在同一个目录下面，在这里将存放在C:\solr-tomcat\solr\data，
如果你想更改目录，或者两个应用存放在不同的目录，请参见下面的xml。
<core name="core0" instanceDir="core0">
<property name="dataDir" value="/data/core0" />
</core>
给core添加子元素 property，property的两个属性就不说了，一看就能明白！
solr.core.name -- The core's name as defined in solr.xml
solr.core.instanceDir -- The core's instance directory (i.e. the directory under which that core's conf/
and data/ directory are located)
solr.core.dataDir -- The core's data directory (i.e. the directory under which that core's index directory
are located)
solr.core.configName -- The name of the core's config file (solrconfig.xml by default)
solr.core.schemaName -- The name of the core's schema file (schema.xml by default)
4》solr.xml具体含义：
1）solr
The <solr> tag accepts two attributes:
persistent - By default, should runtime core manipulation be saved in solr.xml so that it is available
after a restart.
sharedLib - Path to a directory containing .jar files that are added to the classpath of every core. The
path is relative to solr.home (where solr.xml sits)
2）cores
The <cores> tag accepts two attribute:
adminPath - Relative path to access the CoreAdminHandler for dynamic core manipulation. For
example, adminPath="/admin/cores" configures access via http://localhost:8983/solr/admin/cores. If
this attribute is not specified, dynamic manipulation is unavailable.
3）core
The <core> tag accepts two attributes:
name - The registered core name. This will be how the core is accessed.
instanceDir - The solr.home directory for a given core.
dataDir - The data directory for a given core. The default is <instanceDir>/data . It can take an
absolute path or a relative path w.r.t instanceDir . Solr1.4
4）property
The <property> tag accepts two attributes:
name - The name of the property
value - The value of the property
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