"At Alibaba, every month Dragonfly is invoked two billion times and distributes 3.4PB of data. Dragonfly has become one of the most important pieces of infrastructure at Alibaba."

For those that are confused, this is a lot more descriptive:

https://d7y.io/en-us/docs/overview/what_is_dragonfly.html

https://github.com/uber/kraken