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Java™ must be installed. Recommended Java versions are described at HadoopJavaVersions.
ssh must be installed and sshd must be running to use the Hadoop scripts that manage remote Hadoop daemons.
$ sudo apt-get install ssh $ sudo apt-get install rsync
http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/SingleCluster.html
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原文地址:http://www.cnblogs.com/guanx_214/p/5120537.html