1、用jps命令 （1）master节点 启动集群：cy@master:~$ start-all.sh starting namenode, logging to /home/cy/Hadoop/hadoop-1.2.1/libexec/../logs/hadoop-cy-namenode-master.out slave2: starting datanode, logging to /home/cy/Hadoop/hadoop-1.2.1/libexec/../logs/hadoop-cy-datan...