linuxidc@ubuntu:~/hadoop_1.2.1/hadoop-1.2.1/conf$ jps
3472 JobTracker
3604 TaskTracker
3084 NameNode
5550 Jps
3247 DataNode
3391 SecondaryNameNode
linuxidc@ubuntu:~/hadoop_1.2.1/hadoop-1.2.1/conf$
查看hadoop群集的状态
linuxidc@ubuntu:~/hadoop_1.2.1/hadoop-1.2.1/bin$ ./hadoop dfsadmin -report
Configured Capacity: 41083600896 (38.26 GB)
Present Capacity: 32723169280 (30.48 GB)
DFS Remaining: 32723128320 (30.48 GB)
DFS Used: 40960 (40 KB)
DFS Used%: 0%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0
-------------------------------------------------
Datanodes available: 1 (1 total, 0 dead)
Name: 127.0.0.1:50010
Decommission Status : Normal
Configured Capacity: 41083600896 (38.26 GB)
DFS Used: 40960 (40 KB)
Non DFS Used: 8360431616 (7.79 GB)
DFS Remaining: 32723128320(30.48 GB)
DFS Used%: 0%
DFS Remaining%: 79.65%
Last contact: Sat Dec 26 12:22:07 PST 2015
linuxidc@ubuntu:~/hadoop_1.2.1/hadoop-1.2.1/bin$
下面关于Hadoop的文章您也可能喜欢，不妨看看：
Ubuntu14.04下Hadoop2.4.1单机/伪分布式安装配置教程
CentOS安装和配置Hadoop2.2.0