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When PingTask are run by LiveServerPinger, they call PingOp.execute(ExecutablePool pool, ServerLocation server). PingOp only uses hostname and ip (ServerLocation) to get the connection to send the ping message. As all receivers are sharing the same host and port, it is not guaranteed that the connection is really pointing to the server we want to connect to.

We decided to add a retry mechanism to PingOp to be able to discard a connection if the endpoint of that connection is not the server we want to connect to. We have added a new method PingOp.execute(Executable pool, Endpoint endpoint) to solve this. In this way, if the connection obtained is not pointing to the required Endpoint, it can be discarded an ask for a new one.

Other alternatives to the retry mechanism that we have not explored could be:

• Add the option for deactivating the ping mechanism for gw sender/gw receivers communication
• Send the ping using just existing connections, not creating new ones.

Changes and Additions to Public Interfaces

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