Supervisor-Scheduler is able to recognize unexpected lost TCP connections to a Workload Scheduler and avoid unused open TCP connections

In case of a Workload Scheduler lost its TCP connection to the Supervisor and therefore its re-register a second time then the still open TCP connection is closed by the Supervisor and a new connection is establish. The problem with unused open TCP connections is solved in this case.

This case was simulated / tested by throw an test-Exception while the Workload Scheduler tries to register it on the Supervisor. Therefore it try to re-register. And this re-register process recognize the Supervisor. The Supervisor checks if for the given distinct key host/port is already registered and check if the connection is open. If yes, the it closed the unused connection and report this action in the logfile with the message-id SCHEDULER-714 (with given host/port, old connection and new connection)