How to achieve multi-node load balancing on their own website like big players?

admin

I've always been curious about how these large-scale stations achieve real-time consistency across nodes. Are there any projects that can do this? I want to make some idle servers available.
If we use multiple-node backend, then when CDN pulls back-end nodes, how should we choose the fastest one? It seems that either random importance weights or round-robin are used in the CDN pull algorithm. This could potentially slow down.
This is what I am looking for.
This is just an example and not what I am aiming for.