Client-server Action Synchronisation

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Felix35071 wrote:

Come on man, there's no reason to be toxic.

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Suggesting we switch to a synchronous action model like RTS/MOBA games really isn't a good solution. I understand that RTSs/MOBAs don't have desync, but they do have lag after each and every click. When the semantic is that you're ordering a unit around, this lag is understandable, but if you *are* the unit, then it feels really terrible. Right now, our client-prediction allows users in obscure countries to play Path of Exile while under 200+ms of latency. This would be a much worse experience under that alternate action model. In addition, it'd require rewriting most of the game.

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Kikoyou wrote:

Thought about a new Support Gem

What about a : "Cast on Desync" ?

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gehirnmutant wrote:

As I said before: There is a difference between cheat prevention and cheat detection. PoE currently goes for prevention, i.e. all decisions are made by the server and therefore, clients cannot cheat even for a second. I think you can still have the same amount of security and a much better user experience if the client is allowed to make at least some decisions (like the position of your own character) and the server validates them.

For this to work, the server must not only know the outcome of the client's decision, but also everything that influenced that decision, i.e. what server commands had already arrived when the decision was made, and what input came from the user. With this, the server can just feed those inputs into the same logic that the client is using and check that it receives the same result. If it computes some other outcome, it means that the client must be cheating.

So, yes, cheaters would be able to teleport around wildly, but a second later, they'd be banned.

This becomes more complex if the game uses an unreliable protocol for its messages and the client can process server events out-of-order, but with some extra effort, it should still be feasible.

Edit: One drawback of this approach is that some changes that can currently be applied purely server-side would require client updates. As long as the client only handles movement, I can't think of anything (but of course I don't know the source code). Even then, I think we would all gladly download a couple extra updates now and then if this fixes most forms of desync.

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cerebroso120 wrote:

I have played a LOT of MOBA and MMORPG games. Mu online, WoW, league of legends, Silkroad and many others. Not one of them had such serious problems with desync. It either didn't happen to desync like PoE does (randomly teleport character and monsters) or it happened VERY rarely. Since PoE has the worst synch problems and it also have hardcore modes in wich if you die you're out of the league, it REALLY should implement something to fix it. At least making the character invulnerable for like 1 second when he and the monsters randomly teleport on a desync (or rubber band as you like to call it). That's my attempt at making a constructive criticism. Improve and rise or stay the same and rot.