[marknadal]

Great video. I'm impressed you guys built the checker tool, that isn't an easy task - we built something similar called PANIC (https://github.com/gundb/panic-server) that lets us simulate failure cases and then run the test across a distributed system to see if it passes.

I had a question, in the video at a certain point you say that you must modify the code to disallow concurrent debits. This makes sense in theory, but wouldn't it fail in practice? If two machines in different regions are running this code, they would not know that there is a concurrent debit. How si that addressed?