Node.js is gaining significant interest for building scalable web applications. Several large companies like LinkedIn, eBay, and Walmart are using Node.js in production for its performance and scalability benefits when handling input/output bound workloads. Node.js allows non-blocking event-driven programming which helps simplify building applications that interact with services, databases, and handle many concurrent connections using little memory. Its large ecosystem of open-source modules also helps speed up development.

2. Microsoft, digging node

3. Node, GAINING A LOT OF
INTEREST

4. NEW JOBS are exploding

5. SERIOUS adopters

6. Source: https://github.com/joyent/node/wiki/Projects,-Applications,-and-Companies-
Using-Node

7. AND NPM IS OUTTA CONTROL
2011...
~1800 projects
730 active package authors
26 npm contributors
version 1.0 released

8. AND NPM IS OUTTA CONTROL
2012...
72 npm contributors
version 1.1.35 released

9. WHY???

10. Source: http://venturebeat.com/2011/08/16/linkedin-mobile-app/

11. LINKEDIN:
Node drives the mobile stack
“On the server side, our entire
mobile software stack is completely
built in Node,”
KIRAN PRISAD

13. Source: http://www.slideshare.net/phegaro/linkedin-mobile-how-do-we-do-it

14. SCALE
“One reason was scale.”
KIRAN PRISAD

15. Great for io/bound cals
“The second is, if you look at Node,
the thing it’s best at doing is talking
to other services.”
KIRAN PRISAD

16. Great for io/bound cals
“The mobile app has to talk to our
platform API and database. We’re not
doing massive data analytics.”
KIRAN PRISAD

17. Huge perf gains
“Node showed us huge performance
gains compared to what we were
using before, which was Ruby on
Rails.”
KIRAN PRISAD

18. Source: http://www.ebaytechblog.com/2011/11/30/announcing-ql-io//

19. QL.io (EBAY): HTTP gateway
a declarative, evented, data-
retrieval and aggregation gateway
for HTTP APIs
SUBBU ALLAMARAJU

20. Source: http://www.slideshare.net/phegaro/linkedin-mobile-how-do-we-do-it

22. What was important
• Performance and scale for i/o
bound workloads
• Operability
• Low per-connection memory
overhead
SUBBU ALLAMARAJU
• Dynamic language support

23. Fast interations
“Javascript and node.js allowed us
to iterate very rapidly.”
SUBBU ALLAMARAJU

24. rich ecosystem
“Though we were initially concerned
about finding the right tools and
libraries, the node.js ecosystem
proved sufficient for us to build as
complex a system as ql.io.”
SUBBU ALLAMARAJU

25. SuperB scale
“We were able to tune a regular
developer-quality Ubuntu
workstation to handle more than
120,000 active connections per
node.js process, with each connection
consuming about 2k memory.”SUBBU ALLAMARAJU

26. Non BLOCKING /
simplified programming
model
“Node’s evented I/O model freed us
from worrying about locking and
concurrency issues that are common
with multithreaded async I/O.”
SUBBU ALLAMARAJU

27. Source: http://venturebeat.com/2012/01/24/why-walmart-is-using-node-js/

28. Walmart: mobile strategy
In a nutshell, Walmart is able to
serve some very sophisticated
features to mobile users on the
client side using Node.
DION BEN
ALMAER GALBRAITH

30. Walmart: BETter
expErIENCe
“It’s saving mobile shoppers a ton of
time by customizing content based on
device type and browser
capabilities.”
DION BEN
ALMAER GALBRAITH

31. Javascript everywhere
progressive enhancement
“We’ve been fascinated for a long time by
end-to-end JavaScript,” …“a website that
would be rich and dynamic… on devices
that weren’t too powerful.”
DION BEN
ALMAER GALBRAITH

32. Javascript everywhere
progressive enhancement
“Now, on Walmart’s re-engineered Node-
powered mobile app, all the front-end
code gets executed on the back end.”
DION BEN
ALMAER GALBRAITH

33. Scale and flexibility
“We rely on services all over the
world…We do not control all of
those services.”
DION BEN
ALMAER GALBRAITH

34. Scale and flexibility
“Node allows us to front all these
services… and scale up very nicely.
It’s perfect for what we’re doing in
mobile.”
DION BEN
ALMAER GALBRAITH

37. Turner: Disruptive Thinking
“At Turner, Node.js represents a
disruption to the mainstream
thinking around how you build
applications.”
DON BROWNING

38. Turner: Disruptive Thinking
“We found developers were over-
engineering their code; writing code
for the sake of writing code. We
needed to shake things up.”
DON BROWNING

39. Turner: Startup Mentality
“We’re also starting to behave more
like a startup, rather than an
enterprise shop. Quick turn around,
no ceremony, and finding the
Minimum Viable Product.”
DON BROWNING

40. Turner: Startup Mentality
“We’ve found that being a part of the
open-source community really
facilitates this mindset.”
DON BROWNING

41. The node toolbox

42. What’s in npm?
API clients: 118 Message Queues: 15
Boilerplates: 10 Module Loader: 11
Build and deployment: 50 Monitoring and Alerting: 3
Chat: 1 OpenSSL / Crypto / Hashing: 31
Class systems: 11 Other: 35
Compression: 16 Package Management Systems: 7
Content Management Systems: 14 Parsers: 135
Continuous Integration Tools: 3 Payment Gateways: 7
Control flow / Async goodies: 78 RPC: 19
CSS Engines: 12 SMTP: 11
Database: 137 Sound: 2
DDD, CQRS, EventSourcing: 10 TCP / IP: 54
Debugging / console utilities: 75 Templating: 65
Desktop application related: 2 Testing / Spec Frameworks: 75
File system: 13 Web frameworks: 213
Graphics: 39 Web Sockets & Ajax: 32
IL18n and L10n modules: 17 Wrappers: 8
JavaScript threads: 1

59. Contact info
gblock@microsoft.com
@gblock
再见