3 9s of availability is a minimum expectation of all critical Twitch services. Last year, it came to our attention that Sage’s availability had dropped slightly below 99.9% one day in March. Sage was one reliable service you never had to worry about-until the day we did. It’s always been highly over-provisioned as a safeguard against denial of service attacks and fluctuations in activity. Sage runs in over a dozen AWS data centers around the world, fronted by hundreds of CDN points-of-presence. Availability measures the service, while deliverability measures the actual customer experience. A related metric is deliverability, the error-free rate from CDN to browser. We’re measuring availability as the error-free rate of the Sage service load balancers, reported weekly. Therefore, we care about high availability for Sage because you only get one chance to make a first impression.
Once the web platform is loaded, Sage is out of the picture and other services support the viewing experience. If Sage fails to do its job, the user doesn’t reach Twitch and can’t enjoy live video, chat and everything else Twitch offers. That sounds pretty simple, but Sage also supports canary releases, A/B testing, policy enforcement, and search engine metadata retrieval. In response, the Twitch web platform, a single page application, is delivered to the browser by a microservice named Sage, in partnership with a CDN.
Be ready to quickly add capacity when you need it.
#Defend your castle mn full
Use your Content Delivery Network (CDN) as a full partner to protect your service.We developed the following high availability principles for our service: We’ll be talking about what we’ve done beyond the basics. The basics of cloud high availability are well known, such as using redundancy to avoid single points of failure. Whenever you design high availability for a service, you should take into account both the common considerations (that apply to any cloud service) as well as specific opportunities for your service. In this post I’ll share our design, guiding principles, and results. Last year, we designed next-generation availability defenses for one of our critical microservices that raised availability from 99.9% (3 9s) to 99.99% (4 9s). The Client Delivery Platform team owns the infrastructure that delivers Twitch clients to users.
#Defend your castle mn tv
There are many ways to view Twitch, including desktop browsers, mobile devices, game consoles, and TV apps. Twitch is the world’s largest live streaming platform for individuals. Contributors: Adrian Luff, Felix Kastner, and James Hartshorn
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