http://www.youtube.com/watch?v=it9ttbqVSUs

1. Yahoo! scale Node.js
@Fabian_Frank
<fabian@pagefault.de>
The Yahoo! Axis Team
http://axis.yahoo.com

2. Challenges
• Being able to share code (across
applications)
• Dynamic configuration, per environment
• Stability and performance

3. Code re-use
• Different applications (teams), same
problems
• Potential side effects, e.g. through
unexpected updates

4. npm
• Package manager for Node.js packages
• resolves dependencies automatically
• hosts packages in a central registry

5. Mojito and npm
• Every Mojito application can specify its
dependencies in package.json
• Mojito probes node_modules/, when
loading Mojito resources
http://developer.yahoo.com/cocktails/mojito/docs/topics/mojito_npm.html

6. Mojito resource
• YUI Module
• Mojito add-on
• Mojit (views, a controller, models)

7. npm dependencies
"dependencies": {
"mojito": "=0.3.26",
"mojito-shaker": "~0.7.5",
"yui": ">=3.5.1"
}
$ npm shrinkwrap
http://npmjs.org/doc/shrinkwrap.html

8. Internal npm
• Only the build system can publish packages
• Packages are published only after unit and
functional tests passed
• immutable packages

9. Dynamic configuration
• Change application behavior without
redeployment
• JSON is a common way to express
configuration in JavaScript applications
• YQL Storage holds JSON
http://developer.yahoo.com/yql/guide/yql-cloud-chapter.html

10. Configuration through YQL
http://developer.yahoo.com/yql/console/

11. Node.js 0.6
• transparent change for Mojito users
• important fixes and improvements in HTTP
and DNS

12. YUI 3.5
• officially supports Node.js
• removed jsdom dependency
• Y.io uses request as transport layer
http://yuilibrary.com/yui/docs/yui/nodejs.html https://github.com/mikeal/request

13. Node.js 0.8

14. Performance
http://www.slideshare.net/FabianFrankDe/nodejs-performance-case-study

15. Performance
• Mojito&Manhattan compared to
Apache&PHP
• CPU bound
• found that Manhattan can serve twice the
amount of requests at half the latency

16. Performance

17. Stability
• Yahoo! Axis is served using Mojito and
Manhattan
• Hundreds of requests per second
• Static HTML and CSS, dynamic pages,
API entry points
• Monitoring

18. Building and Maintenance
• Need to know only one language and
framework, no context switches.
• Allows to postpone design decisions
• Easier to revert design decisions
• Easier deployment and resource allocation
http://developer.yahoo.com/blogs/ydn/posts/2011/11/yahoo-announces-cocktails-%E2%80%93-shaken-not-stirred/

19. Conclusion
• Mojito works for our computers
• Mojito works for us, as engineers

20. Thank you!
• Fabio Hirata, @fabiohh
• Caridy Patiño, @caridy
• Eugene Kashida, @ekashida
• Fabian Frank, @Fabian_Frank