Usage: hadoop [--config confdir] COMMAND
where COMMAND is one of:
namenode -format format the DFS filesystem(格式化DFS文件系统)
secondarynamenode run the DFS secondary namenode(运行第二个namenode)
namenode run the DFS namenode(运行namenode)
datanode run a DFS datanode(运行datenode)
dfsadmin run a DFS admin client(运行dfs的admin客户端)
mradmin run a Map-Reduce admin client(运行map-reduce的admin客户端)
fsck run a DFS filesystem checking utility(运行文件系统检测工具)
fs run a generic filesystem user client(运行普通的文件系统用户客户端)
balancer run a cluster balancing utility(运行集群负载均衡工具)
fetchdt fetch a delegation token from the NameNode
jobtracker run the MapReduce job Tracker node(运行jobtracker节点)
pipes run a Pipes job(运行管道job)
tasktracker run a MapReduce task Tracker node(运行tasktracker节点)
historyserver run job history servers as a standalone daemon
job manipulate MapReduce jobs(处理job)
queue get information regarding JobQueues
version print the version(输出hadoop的版本)
jar <jar> run a jar file(运行一个jar文件)
distcp <srcurl> <desturl> copy file or directories recursively(递归的复制文件或目录)
archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive(生成Hadoop档案)
classpath prints the class path needed to get the
Hadoop jar and the required libraries(打印hadoop需要的jar或classpath)
daemonlog get/set the log level for each daemon(获取或设置每个daemon的日志级别)
or
CLASSNAME run the class named CLASSNAME(运行指定类名的类)