1. Incremental deployment
of new features
Sean Sullivan
Portland Java User Group
January 17, 2012

3. • Gilt Groupe
• International Shipping project
• Incremental deployment

4. Gilt Groupe

5. online retailer

6. venture backed company

7. May 2011

8. What does Gilt sell?

9. Apparel

13. Home furnishings

15. Food

17. Local deals

19. Travel

21. Gilt HQ

23. Gilt Portland

25. International Shipping

26. November 2011

27. Project goals
• allow Gilt’s customers to ship merchandise
worldwide
• display price information in customer’s
preferred currency
• accept payment in customer’s preferred
currency

28. Project goals
• legal compliance
• fraud prevention
• streamlined user experience

29. Technical scope
• Checkout UI • Warehouse
• Data model • Finance
• Order processing • Reporting
• Payment processing • Web analytics
• Email • Third party integration

30. Checkout UI
Checkout 1.0 Checkout 2.0
• Ruby on Rails • Java + JSP
• Domestic checkout • Domestic checkout
only
• International checkout
• Clear separation between
UI logic and business logic

31. International Checkout

33. Project roadmap

34. 1. Write code
2. Deploy to production
3. Profit!

35. Deploy to production?

37. We need a
deployment strategy!

38. Deploy early, deploy often?

39. Velocity conference
June 2009

40. Dark launch?

41. Facebook Engineering
July 2009

42. Feature flags?

43. Flickr engineering
December 2009

45. Ramp up gradually?

46. Facebook Engineering
May 2008

47. Dog food?

48. wikipedia.org

49. joelonsoftware.com

50. Gilt deployment strategy

51. 1. dev team builds feature using “feature flags”
2. QA testing
3. deploy new feature to production

52. 4. make feature available to a subset of Gilt
employees
5. make feature available to all Gilt employees

53. 6. make feature available to a subset of
customers
7. gradually ramp up to all customers
100%

54. User partitions

55. Partition 1 Partition 2 Partition 3 ... Partition 1000

56. Intelligent routing

57. Checkout 1.0
Zeus
Checkout 2.0

58. Detecting feature
availability at runtime

59. Java API
import com.mycorp.FeatureService;
if (featureService.isFeatureEnabled(appRequest,
INTERNATIONAL_SHIPPING)) {
// do something
}
else {
// do something else
}

60. Custom JSP tag
<%@ taglib uri="/WEB-INF/mycorp.tld" prefix="mycorp" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<c:choose>
<c:when test=”${mycorp.isFeatureEnabled(‘internationalShipping’, pageContext)}”>
International Shipping!
</c:when>
<c:otherwise>
<img src=”nyan-cat.jpg”/>
</c:otherwise>
</c:choose>

61. Questions?

62. THE END