How to handle host migration in network programming

Michael Graeb
Tue, 17 Mar 2015 04:52:33 +0000
Multiplayer & Networking

I’m reading about network programming in UE4, but I’ve seen no mention of host migration. Say I want something to happen one time only and I set up a blueprint like this:

OnActorBeginOverlap → SwitchHasAuthority → DoOnce → MyResultingAction

I run 3 game instances: A, B, and C.

A is the host (authority).

One player overlaps the trigger.

A’s blueprint carries out the MyResultingAction because it is the host (blueprints on B and C stop at the SwitchHasAuthority node).

The DoOnce node prevents the MyResultingAction from ever happening again on A.

A (the host) quits.

B takes over as the new host.

If a player overlaps the trigger again, will B’s blueprint carry out the MyResultingAction? Does the DoOnce node on B know that it fired before on A?

Do I need to make my own kind of “do once” node that uses a replicated boolean to track across all machines that the node has fired?

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