When you send a msg to another node, if the local node doesn't already have a connection to the destination node, it has to contact epmd and try and resolve the remote node. This takes time. Thus, in the event of a distributed gm group, it's very important that we record asap when a member dies as that member might be our downstream, to which we're sending, and it might be on another node. Thus promote the DOWN messages. Because of the inherent races going on, gm is built to cope with this anyway. This has the nice benefit that promotion of slaves to master in the event of failure of master is now pretty much instantaneous

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