利用 Replication Handler 备份索引

solr 索引备份最简单的方式是通过 Replication Handler。在使用 Replication Handler 之前，需要将 solrconfig.xml 中 SolrReplicationHandler 的注释去掉：

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< requestHandler name = "/replication" class = "solr.ReplicationHandler" >    < lst name = "master" >      < str name = "replicateAfter" >commit</ str >      < str name = "replicateAfter" >startup</ str >      < str name = "confFiles" >schema.xml,stopwords.txt</ str >    </ lst >    < lst name = "slave" >      < str name = "masterUrl" >http://localhost:8983/solr/replication</ str >      < str name = "pollInterval" >00:00:60</ str >    </ lst > </ requestHandler >

然后启动 web 容器，启动完成后执行

http://localhost:81/apache-solr-3.5.0/replication?command=backup

该请求成功的话，会得到：

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< response > < lst name = "responseHeader" > < int name = "status" >0</ int > < int name = "QTime" >42</ int > </ lst > < str name = "status" >OK</ str > </ response >

此时在 solr/home 的 data 目录下，会发现类似 snapshot.20120626210126 的目录，该目录就是备份出来的索引库