akka/akka — pull request #1480 by patriknw (2013-05-24 13:42:25+00:00)
Title: Start heartbeatSender after Welcome, see #3388

* Otherwise, if the Welcome message is lost, other nodes
in the cluster will send HeartbeatRequest and it will start
sending heartbeats without being a real member and the lost Welcome
is not detected by the other members in the cluster