nutch 分布式搜索-standalone mode
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本地模式篇，其实就是相当 于之前图中的虚线部分。詳細如下图：
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安装步骤:
1.search client that acts as a web container to make requests.
2.search servers which supply services to feed
? ./bin/nutch server <port> <path/to/crawl>
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* search-servers.txt is the file that marks as a distributed search action.
* 如果其中一个search server down,是不影响正常搜索的，只是結果数减少而已。一旦restore后就恢复正常。
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see also:
distributed search
