Consistent hashing is a common baseline, but it's not the hardest problem in this. You still have to move some data when you shuffle nodes and the devil is in

Consistent hashing is a common baseline, but it's not the hardest problem in this. You still have to move some data when you shuffle nodes and the devil is in the detail there; when/how to move chunks without interrupting access or violating integrity, how to ensure n-copies (if redundancy is required), how to prevent hot-spots. And of course all the aggregation/routing to allow complex queries that span nodes. That's the reason why there are very few out-of-the-box sharding solutions. It's just very tough to get right, and one size won't fit all.