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Facebook Mobile Drops Pull For Push-based Snapshot + Delta Model

Facebook Mobile Drops Pull For Push-based Snapshot + Delta Model:

We’ve learned mobile is different. In If You’re Programming A Cell Phone Like A Server You’re Doing It Wrong we learned programming for a mobile platform is its own specialty. In How Facebook Makes Mobile Work At Scale For All Phones, On All Screens, On All Networks we learned bandwidth on mobile networks is a precious resource. 

Given all that, how do you design a protocol to sync state (think messages, comments, etc.) between mobile nodes and the global state holding servers located in a datacenter?

Facebook recently wrote about their new solution to this problem in Building Mobile-First Infrastructure for Messenger. They were able to reduce bandwidth usage by 40% and reduced by 20% the terror of hitting send on a phone.

That’s a big win…that came from a protocol change.

Facebook Messanger went from a traditional notification triggered full state pull:

via High Scalability