在Linux(Ubuntu)上安装Hadoop
??? 1. 安装 SSH
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???hadoop使用ssh进行通信，需要为ssh配置免密码登录
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chenwq@ubuntu:/$ hadoop versionHadoop 0.21.0Subversion https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.21 -r 985326Compiled by tomwhite on Tue Aug 17 01:02:28 EDT 2010From source with checksum a1aeb15b4854808d152989ba76f90fac
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