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# Migrating Critical Traffic At Scale with No Downtime — Part 2
- **期号**: SRE Weekly Issue #377(2023-06-18)
- **作者**: Shyam Gala, Javier Fernandez-Ivern, Anup Rokkam Pratap, and Devang Shah — Netflix
- **链接**: https://netflixtechblog.com/migrating-critical-traffic-at-scale-with-no-downtime-part-2-4b1c8c7155c1
## 简介
In part 1, they outlined how they replay real traffic to test a new system before deploying it. In this article, they build on that with three additional techniques: sticky canaries, A/B testing, and gradually shifting traffic to the new system in production.
## 正文
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