[danieljomphe]

From what I remember, compare-and-swap semantics are in place for that kind of case.

If that was not the case, you could still model such an order-dependent update as the fact that the counter has seen one more hit. Let the final query reduce that to the final count, and let the local cache implementation optimize that cost away for all but the first query, and then incrementally optimize the further queries when they are to see an increased count.

That said, I'm pretty sure I've seen the simpler CAS semantics support. (The CAS-successful update, if CAS is really supported, is still implemented as an "upsert", which means old counter values remain accessible if you query the past of the DB.)

[danieljomphe]

Forget my last paragraph. Anyways, richhickey answered. :)