Comment by luuio

Look up the two general problem on youtube. Unless the entire end to end operation is wrapped inside a giant transaction, no system in the world can give you the confirmation.

Imagine this: you issued a write, a few things can happen: 1. The callsite crashed, maybe due to an out of memory issue or whatever. You don't know if it succeeded

2. The database returned an acknowledgement, but then the callsite crashed before storing the acknowlwedgement for the next step.