36 lines
1.2 KiB
Markdown
36 lines
1.2 KiB
Markdown
---
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title: "Feature Flag"
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type: concept
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tags: [持续交付, 特性管理, 发布工程]
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sources: ["https://launchdarkly.com/blog/rto-vs-rpo/"]
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last_updated: 2025-07-26
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---
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## Definition
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Feature Flag（特性开关）是一种将代码部署与功能发布分离的技术，允许在不重新部署的情况下通过配置切换代码执行路径。
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## Key Concepts
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- Deploy != Release：部署代码但不立即向用户开放
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- Kill Switch：紧急关闭机制，用于快速禁用问题功能
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- 渐进式 Rollout：分阶段向用户群发布（1% → 5% → 25% → 100%）
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## Benefits for RTO/RPO
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- RTO：从小时级降至秒级（只需关闭开关）
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- RPO：Rollback 时不丢失数据，只需切换代码路径
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## Code Example
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```javascript
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if (featureFlag.enabled('new-checkout-flow')) {
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return newCheckoutProcess();
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} else {
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return oldCheckoutProcess();
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}
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```
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## Connections
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- [[Kill Switch]] ← 紧急机制 → [[Feature Flag]]
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- [[渐进式发布]] ← 发布策略 → [[Feature Flag]]
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- [[RTO (Recovery Time Objective)]] ← 降低工具 → [[Feature Flag]]
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- [[RPO (Recovery Point Objective)]] ← 保护工具 → [[Feature Flag]]
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- [[LaunchDarkly]] ← 平台 → [[Feature Flag]]
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