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资料:http://www.cnblogs.com/chinacloud/archive/2010/12/03/1895369.html
HDFS:Hadoop Distributed File System hadoop分布式文件管理系统
左边是 slaves 右边是master master里有 Namenode 和JobTacker
hadoop 概念
原文地址:http://www.cnblogs.com/weixiaole/p/4301157.html