本文讨论了在管理Hadoop集群时如何利用SSH进行远程操作，避免使用rlogin等过时的方法。特别强调了在启动和停止集群时，start-all.sh和stop-all.sh脚本如何使用SSH来实现跨节点的命令执行。
在namenode执行start-all.sh和stop-all.sh时候会通过ssh执行相关命令
cloudera网站：
When SSH is and is not Used
It is a good idea to use SSH for remote administration purposes (instead of rlogin, for example) but note that Hadoop itself and the related services do not use SSH for communication as a matter of course. Some scripts, and in particular the Hadoop start-all and stop-all scripts, do use SSH, but otherwise SSH is not used for communication among the following:
Datanode
Namenode
TaskTracker
JobTracker
/etc/init.d scripts (which start daemons locally)
It is a good idea to use SSH for remote administration purposes (instead of rlogin, for example) but note that Hadoop itself and the related services do not use SSH for communication as a matter of course. Some scripts, and in particular the Hadoop start-all and stop-all scripts, do use SSH, but otherwise SSH is not used for communication among the following:
Datanode
Namenode
TaskTracker
JobTracker
/etc/init.d scripts (which start daemons locally)
参考：https://ccp.cloudera.com/display/CDHDOC/CDH3+Deployment+on+a+Cluster
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