https://github.com/tarantool/vshard is current cluster solution for Tarantool. It introduces concept of "routers" - Tarantool instances which route requests to appropriate "storage" instances where data is actually stored.

I think we could add TarantoolClusterClient for tarantool clusters, which will round-robin requests to a group of Tarantool instances. It will be also useful to be able to pass custom sharding function to it (for custom sharding solutions).