Finagle is our fault tolerant, protocol-agnostic RPC framework built atop Netty. Twitter’s core services are built on Finagle, from backends serving user profile information, Tweets, and timelines to front end API endpoints handling HTTP requests. Part of scaling Twitter was the shift from a monolithic Ruby on Rails application to a service-oriented architecture. In order to build out this new arc
![Netty at Twitter with Finagle](https://cdn-ak-scissors.b.st-hatena.com/image/square/a7dfbba80c1b2e3d08e53178d335285f8dc68548/height=288;version=1;width=512/https%3A%2F%2Fcdn.cms-twdigitalassets.com%2Fcontent%2Fdam%2Fblog-twitter%2Fengineering%2Fen_us%2Fmain-template-assets%2FEng_EXPLORE_Pink.png.twimg.768.png)