I find all of this fascinating. A few years ago, the guys who built Chick-fil-a's POS fog were on HN talking about their fault-tolerance and transaction queuei

I find all of this fascinating. A few years ago, the guys who built Chick-fil-a's POS fog were on HN talking about their fault-tolerance and transaction queueing. It was quite interesting. There's a lot that you can learn from high-volume POS system design that applies to just bog-standard every day programming.