[Dylan16807]

Depends on what you mean by window.

If you mean a window for that node to act before it realizes there's a partition, your Consistency protocol should prevent that. Anything that requires all nodes to respond should work.

If you mean a window for the node to receive the request, without acting on it, before it fails, that doesn't really matter. From the outside you can't tell the difference between a node that failed before it got your request, and one that failed immediately after. And note this quote:

"Brewer originally only required almost all requests to receive a response. As allowing probabilistic availability does not change the result when arbitrary failures occur, for simplicity we are requiring 100% availability"

Plus, any other interpretation would make node failure fundamentally incompatible with Availability. You will always lose a request that was lodged one nanosecond before node failure.