Knox DSL - Ensure that HTTP client is closed on shutdown

The class org.apache.hadoop.gateway.shell.Hadoop used to connect to knox doesn't close opened socket.
The "shutdown" method of org...shell.Hadoop doesn't call client.close() and this produces too much permanent CLOSE_WAIT sockest.

Suggestion:

public void shutdown() throws InterruptedException

{ - executor.shutdown(); + closeClient(); }

public boolean shutdown( long timeout, TimeUnit unit ) throws InterruptedException

{ - executor.shutdown(); + closeClient(); return executor.awaitTermination( timeout, unit ); }

+
+ private void closeClient(){
+ executor.shutdownNow();
+ if(client!=null)

{ + client.close(); + }

+ }