逃离 Fork：Meta 如何在 50 多个用例中现代化 WebRTC

At Meta, WebRTC powers real-time audio and video across various platforms. But forking a large open-source project like WebRTC within our monorepo presents unique challenges – over time, an internal fork can drift behind upstream, cutting itself off from community upgrades.
在 Meta，WebRTC 为各种平台提供实时音频和视频。但在我们的 monorepo 中 fork 一个像 WebRTC 这样的大型开源项目会带来独特挑战––随着时间推移，内部 fork 可能会落后于 upstream，从而与社区升级脱节。
We’re sharing how we escaped this “forking trap” – from building a dual-stack architecture that enabled safe A/B testing across 50+ use cases, to the workflows that now keep us continuously upgraded with upstream.
我们分享了如何逃脱这个“forking trap”——从构建一个支持跨 50+ 用例的安全 A/B testing 的 dual-stack 架构，到现在让我们与 upstream 持续升级的工作流程。
This approach improved performance, binary size, and security – and we continue to use it today to A/B test each new upstream release before rolling it out.
这种方法改善了性能、二进制大小和安全性––我们今天仍在使用它来在推出前对每个新的 upstream 版本进行 A/B 测试。

At Meta, real-time communication (RTC) powers various services, from global Messenger and Instagram video chats to low-latency Cloud Gaming and immersive VR casting on Meta Quest. To meet the performance demands of billions of users, we spent years developing a specialized, high-performance variant of the open-source WebRTC library.

在 Meta，实时通信 (RTC) 为各种服务提供动力，从全球 Messenger 和 Instagram 视频聊天，到低延迟 Cloud Gaming 和 Meta Quest 上的沉浸式 VR 投屏。为了满足数十亿用户的性能需求，我们花了数年时间开发开源 WebRTC 库的专用、高性能变体。

Permanently forking a big open-source project can result in a common industry trap. It starts with good intentions: You need a specific internal optimization or a quick bug fix. But over time, as the upstream project evolves and your internal features accumulate, the resources needed to merge in external commits can become prohibitive.

永久 fork 一个大型开源项目可能会陷入常见的行业陷阱。一开始是好意：你需要特定的内部优化或快速 bug 修复。但随着时间推移，随着 upstream 项目的发展和你内部功能的积累，并入外部提交所需的资源可能会变得不可承受。

Recently, we officially concluded a massive multiyear migration to break this cycle. We successfully moved over 50 use cases from a divergent WebRTC fork to a modular architectur...