[ayende]

Even with very small number of requests - what happens when you have two concurrent ones?

[fiskfiskfisk]

You can set concurrency limits per function on AWS, so you can apply a hard limit on your function to only have a single invocation running at the same time. That should give you a guarantee that data isn't lost without the producer noticing.

[frou_dh]

I wonder whether that kind of thing is actually bulletproof and doesn't end up having 2 running concurrently in some scenario.