Server for games with giant procedural generated world

Yes, i am talking about something like minecraft. It has no preset world map, and the world is so big, players are not supposed to download the whole map before gaming. And the client side is not supposed to have all entities in the world loaded and sync

So far, i have some beginner level experience with Unet, Photon, and Colyseus. I feel that they are designed for a small room which everything need to be sync between users. So, it seems they are not suitable for my situation? Is there any existing solution that i can use? or i have to write everything from sketch?

i also have questions about how to efficiently real time save/load any change on this map in multi threading, but that's next step/

 

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Has a giant procedural world like Minecraft