MWG uses the concurrent connections as the only metric to distribute load. If a request comes in from an unknown source IP the machine with the least open connections will become responsible for this client. If the client is not seen anymore for a couple of minutes MWG "forgets" about him and the process starts over.
The load sharing MWG performs is pretty simple so it does not provide you with all the features, control and monitoring a full featured load balancer provides.
Is there any possibility to manually change a stickiness time of ip to particular node ? What is the default time ? And the last question, is there a possibilty to manually clear or view map of stickiness ?