Q: There are something wrong about Hadoop cluster 
*

*I have build a hadoop cluster on ECS on Aliyun of Alibaba.com( it's like AWS). The OS is Ubuntu12.04 . The version of Hadoop is 2.7.1

*The cluster is consisted of one master and two slaves.

*I can start it successfully. Every node can work well, and I
can use ssh to access two slave node from master node.

*Every node is started.

*But when I run the wordcount program, there is something wrong. The
error is as following:
exception: java.net.ConnectException: Call From master/10.144.52.189 to localhost:38635 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused


*When I added Port 38635 in the file /etc/ssh/sshd_config, I run the wordcount program again. The error is still existed, the only difference is the Port 38635 changed.
exception: java.net.ConnectException: Call From master/10.144.52.189 to localhost:46656 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused

How to fix this problem? The ports 38635 and 46656 are added in /etc/ssh/sshd_config, the error occurs when run the wordcount program with a new port in the error information. 
