I’m pretty new to the fediverse, and I find the idea amazing. But one thing concerns me though. How will server owners be able to afford to run servers with massive amounts of data coming through them? Theoretically speaking, if a Reddit migration were to happen how would server upkeep costs look like?
Just reading through this it seems crazy to me that lemmy.world is being scaled vertically, is there something about how it works that prevents horizontal scaling (like, load balancing across a number of servers all using the same db)?
From what I understand, Lemmy is just using a PostgreSQL database, and there’s many ways to load balance and horizontally scale it. You could use something like HAProxy for load balancing, and for horizontal scaling, you could add multiple PostgreSQL slave nodes and if you want to manage the scaling automatically, you could use a tool like ClusterControl or w/e. There’s plenty of doco on the web around this and it’s not specific to Lemmy.
You can scale app servers surprisingly far before you need to shard a decently sized single master postgres cluster. Like, probably 20-50+ times the current write traffic it seems this instance has. It was probably due to the websockets thing, thinking about it. With 0.18, that goes away and requests can be stateless, cached, and you can throw a load balancer and n app servers at it.