By finding the natural sharding factor. If you have one, which very often you do. Three completely different examples:<p>- Are you running a mail server? Every user is an actor (i.e. an sqlite instance).<p>- Are you running a backend for a dropbox&#x2F;evernote&#x2F;messaging type app? Every user is an actor.<p>- Do you have a distributed filesystem? Use the KV mode and shard on file hash.<p>- Do you need scalable counters? Use KV mode again, split every counter into 10 (or 100) and increment&#x2F;decrement on those.