检测hadoop程序的小技巧

这里总结一些检测hadoop是否正常启动的一些小技巧

 

1：查看hadoop的进程，利用java自带的jps

例如在master上执行后的输出

 

[dikar@dikar logs]$ jps
6652 Sancho
3813 
9760 Jps
9629 SecondaryNameNode
9451 NameNode
[dikar@dikar logs]$ 

 在slaves上执行的输出

 

[dikar@dikar121 data]$ jps
2210 Jps
2137 DataNode
[dikar@dikar121 data]$ 

 

2：检测监听端口是否启动，利用netstat

例如我需要检测54310是否开启并且有连接进来

 

[dikar@dikar logs]$ netstat -altnp | fgrep 54310
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 ::ffff:10.0.18.105:54310    :::*                        LISTEN      9451/java           
tcp        0      0 ::ffff:10.0.18.105:37804    ::ffff:10.0.18.105:54310    TIME_WAIT   -                   
tcp        0      0 ::ffff:10.0.18.105:54310    ::ffff:10.0.18.121:40535    ESTABLISHED 9451/java           
tcp        0      0 ::ffff:10.0.18.105:54310    ::ffff:10.0.18.122:51895    ESTABLISHED 9451/java  

 

3：检测master 和slaves之间的端口访问控制

例如在slaves上telnet master的 54310端口  或者在 master上telnet slaves的 50010 端口

 

[dikar@dikar121 data]$ telnet 10.0.18.105 54310
Trying 10.0.18.105...
Connected to 10.0.18.105.
Escape character is '^]'.
^]

telnet> quit
Connection closed.
[dikar@dikar121 data]$ 

 

 

[dikar@dikar logs]$ telnet 10.0.18.122 50010
Trying 10.0.18.122...
Connected to 10.0.18.122.
Escape character is '^]'.
^]

telnet> quit 
Connection closed.
[dikar@dikar logs]$ 

 

   如果telnet可以通的话 会提示说：

Escape character is '^]'.

   然后输入 ctrl + ］进入telnet命令提示符 然后quit 就退出了。