Why MongoDB Never Worked Out at Etsy December 26th, 2012 In 2010ish, we tried to roll out a feature (Treasury) using MongoDB. It was an interesting experience. I learned quite a bit in the process. I wrote about what I was thinking at the time here. But for the most part it was an abject failure and Ryan Young wound up porting the entire thing to the MySQL shards which had come to maturity in the