Fast, Safe, and Reliable: The Future of Configuration
summary
Yelp builds a file-backed config system that dynamically reloads constants so services update without redeploys; configs live in a serf configs repo and reach thousands of servers via rsync replicas, serving hundreds of services. Deploys use branch-prefixed pushes to create a deployment version, a branches.json control file, Slack staged rollouts (staging → canary → prod) and a one-click rollback. The system reduces deploy latency, surfaces failures (one outage lasted 15 minutes) and is working at scale.
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chapters (22)
- 0:00Intro
- 1:14Application Configuration
- 2:25Single Module Configuration
- 3:22Environment Variables
- 4:12File Loading
- 5:01Git
- 5:55Rsync
- 7:04Example
- 8:16Why Configuration
- 9:00Configuration Example
- 10:39Configuration Incident Analysis
- 13:37Key Features
- 16:02Rolling Back
- 16:16Deployment Process
- 17:09rollback
- 17:33monitoring
- 18:21databases
- 18:31data stores
- 19:21files have great features
- 21:00impact on developers
- 21:35hybrid systems
- 22:16conclusion
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