When I saw the post about Foundation DB, I remembered the exact same demo running on a cluster of Raspberry Pi instances! Sadly, no memory of it on YouTube.
I feel like I saw something a bit more refined (I recall node statuses aggregated on one cool UI), so this may have been an earlier iteration, but the beginning of the following video has some of what we're talking about: https://youtu.be/Nrb3LN7X1Pg
https://news.ycombinator.com/item?id=5739721