How to implement virtual nodes

Question

Virtual nodes are used to virtualize a real address into multiple virtual addresses in order to store data more evenly

But how to implement the specific code?

Is it client-side implementation or server-side implementation?

Does the client class library provide support through configuration or does it require programmers to write code?

If I write code to implement it, I can calculate the real address of a key, and then how to obtain the data?

Should there be method overloading such as Set (address, key, value) Get (address, key), but there is not actually one? So how to implement virtual nodes?