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. 

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

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