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

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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

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Python代码??

1. [dikar@dikar?logs]$?jps??
2. 6652?Sancho??
3. 3813???
4. 9760?Jps??
5. 9629?SecondaryNameNode??
6. 9451?NameNode??
7. [dikar@dikar?logs]$???

?在slaves上执行的输出

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Python代码??

1. [dikar@dikar121?data]$?jps??
2. 2210?Jps??
3. 2137?DataNode??
4. [dikar@dikar121?data]$???

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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

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Python代码??

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

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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

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Python代码??

1. [dikar@dikar121?data]$?telnet?10.0.18.105?54310??
2. Trying?10.0.18.105...??
3. Connected?to?10.0.18.105.??
4. Escape?character?is?'^]'.??
5. ^]??
6. ??
7. telnet>?quit??
8. Connection?closed.??
9. [dikar@dikar121?data]$???

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Python代码??

1. [dikar@dikar?logs]$?telnet?10.0.18.122?50010??
2. Trying?10.0.18.122...??
3. Connected?to?10.0.18.122.??
4. Escape?character?is?'^]'.??
5. ^]??
6. ??
7. telnet>?quit???
8. Connection?closed.??
9. [dikar@dikar?logs]$???

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?? 如果telnet可以通的话 会提示说：

Python代码??

1. Escape?character?is?'^]'.??

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

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