There's nothing that requires most auto id keys to be monotonically sequential, which is the bottleneck when distributed. If uniqueness is all that's required,

There's nothing that requires most auto id keys to be monotonically sequential, which is the bottleneck when distributed. If uniqueness is all that's required, blocks of id's can be handed to different hosts and replenished on demand. Gap-free, monotonically increasing id's should only be used for things that have regulatory compliance issues. For example, there shall be no gaps in invoice id's, and voided ones shall be marked.