bin/hadoop jar /home/***/secure_hadoop_project.jar package.OldInfoMerge /merges/old.txt /merges/tmp1 &
查看根目录的列表
bin/hadoop fs -lsr /
单节点启动
5)重启namenode
sudo -u hdfs /usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf/ stop namenode
sudo -u hdfs /usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf/ start namenode
重启jobtracker，在主节点（jobtracker）执行：
sudo -u mapred /usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf/ stop jobtracker
sudo -u mapred /usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf/ start jobtracker
重启动datanode
sudo -u hdfs /usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf/ start datanode
删除job
bin/hadoop job -kill #jobid