> Unless the entire end to end operation is wrapped inside a giant transaction, no system in the world can give you the confirmation.

But how do people use, say, redis, without an external "checkpoint" system, how do you do, say, an INCR operation, and know if it succeeded or not?

Or are most uses of redis actually dangerous and subject to these error conditions, perhaps it's tolerable to risk that error for most redis use cases, but wasn't for the system under discussion? Most developers using redis definitely aren't using external "checkpointing" systems, or considering if they should be or not -- should they be?

But of course you've convinced me that the system under discussion would have been better off using an rdbms, something I never doubted.