大规模动态配置变更的安全防护

By Cosmo Qiu, Bo Teng, Siyuan Zhou, Ankur Soni, Willis Harvey

由 Cosmo Qiu、Bo Teng、Siyuan Zhou、Ankur Soni、Willis Harvey

Dynamic configuration is a core infrastructure capability in modern systems. It allows developers to change runtime behavior without restarting or redeploying services, even as the number of services and requests grows. In practice, that might mean rolling out a new address form for a region launch, tightening an authorization rule, or adjusting timeouts when a dependency is slow.

Dynamic configuration 是现代系统中核心的基础设施能力。它允许开发者在不重启或重新部署服务的情况下更改运行时行为，即使服务和请求数量不断增长。在实践中，这可能意味着为区域发布 rollout 一个新的地址表单、收紧 authorization 规则，或者在依赖项变慢时调整 timeouts。

Like any powerful tool, dynamic configuration is a double-edged sword. While it enables fast iteration and rapid incident response, a bad change can cause regressions or even outages. This is a common challenge across the industry: balancing developer flexibility with system reliability.

像任何强大的工具一样，dynamic configuration 是一把双刃剑。虽然它实现了快速迭代和快速事件响应，但一个坏的变更可能导致 regressions 甚至 outages。这是整个行业面临的共同挑战：平衡开发者的灵活性和系统的可靠性。

In this post, we will outline the expectations of a modern dynamic configuration platform, then walk through the high-level architecture of Airbnb’s dynamic config platform and how its core components work together to enable safe, flexible config changes.

在本文中，我们将概述现代动态配置平台的要求，然后介绍 Airbnb 的动态配置平台的高层次架构，以及其核心组件如何协同工作以实现安全、灵活的配置变更。

Modern config platform essentials

现代配置平台的核心要素

As Airbnb’s business grows, our expectations for the dynamic config platform have evolved over time through our own learnings as well as industry best practices. These shape our view of what a good dynamic config platform should provide, including:

随着 Airbnb 业务的增长，我们对动态 config 平台的期望随着时间推移，通过我们自己的经验以及行业最佳实践而演变。这些塑造了我们对良好动态 config 平台应提供的观点，包括：

• A coherent experience for config management: The platform provides a streamlined, end-to-end experience for defining, reviewing, testing, and rolling out config changes. It covers the most common needs out of the box with rich built-in features, while st...