SparkSubmit will open the port to communicate with the APP Master and 

This port is not closing the IDLE connections,so it is vulnerable for DOS 
attack,I did telnet IP port and this connection is not closed. 

In order to fix this I tried to Handle in the *userEventTriggered * of 
* * class,to my surprise APP master is also IDLE 
if no JOB is submitted ,so fixing this will result in terminating the 
connection for APP master also. 

If there is a long running JOB then this solution impact this Use case.

Any one have you come across this type of problem,and is there any other way 
to fix this issue 

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