Many load-balancing use cases (e.g., caches or stateless services that simply work better with affinity) don't need the old data. If you need redundancy, the or

Many load-balancing use cases (e.g., caches or stateless services that simply work better with affinity) don't need the old data. If you need redundancy, the ordering also tells you where to duplicate the data: durably send updates to the first k + 1 servers in the list, and you're safe against up to k failures.