Learn how Walmart embraced the concepts of reactive programming, microservices, and domain-driven design to achieve results impossible only a decade ago.

1. Revitalizing
Walmart'sAging
Architecture for
Web Scale

2. Typesafe
Reactive
Platform
» Play - RESTful API
framework
» Akka - Distributed
computing framework
» Spark - General purpose in-
memory compute engine
» ConductR, Monitoring, and
commercial features

3. Whymicroservices?

4. 2005architecture

5. 2015architecture

6. 2020architecture

7. Size ofthe internettoday

8. Theworld by2020
» 4 billion connected people
» 25+ million apps
» 25+ billion embedded systems
» 40 zettabytes (40 trillion gigabytes)
» 5,200 GB of data for every person on Earth

9. WalmartCanada

10. Business Impact

11. The goal
» ~100% availability ("nine nines")

12. The goal
» ~100% availability ("nine nines")
» Consistent responsiveness under varying load
conditions

13. The goal
» ~100% availability ("nine nines")
» Consistent responsiveness under varying load
conditions
» Predictable spikes of traffic, e.g, Black Friday
» Less predictable spikes of traffic, e.g,
marketing campaign driving traffic

14. The goal
» ~100% availability ("nine nines")
» Consistent responsiveness under varying load
conditions
» Predictable spikes of traffic, e.g, Black Friday
» Less predictable spikes of traffic, e.g,
marketing campaign driving traffic
» Enable LOBs to rapidly adapt to market conditions

15. ARevitalizedArchitecture

16. Walmart's Business Uplift
» Conversions up 20%
» Mobile orders up 98%
» No downtime Black Friday or Boxing Day

17. Walmart's OperationalSavings
» Moved off expensive hardware
» On cheap virtual x86 servers
» 20% - 50% cost savings
» ~ 40% compute cycles

18. Whereto begin?

23. asynchronous, non-blocking, real-time, highly-
available, loosely coupled, scalable, fault-tolerant,
concurrent, reactive, event-driven, push instead of
pull, distributed, low latency, high throughput...

24. asynchronous, non-blocking, real-time, highly-
available, loosely coupled, scalable, fault-tolerant,
concurrent, reactive, event-driven, push instead of
pull, distributed, low latency, high throughput...
Too complicated. We need a simple vocabulary.

25. Reactive
The ultimate maturity model
for microservices.
» Responsive
» Resilient
» Elastic
» Message-driven

26. Why,What, How
Reactive (principles)
» responsive, resilient,
elastic, message-driven

27. Why,What, How
Reactive (principles)
» responsive, resilient,
elastic, message-driven
Microservices (strategy)
» bounded contexts (DDD),
event sourcing, CQRS,
eventual consistency

28. Why,What, How
Reactive (principles)
» responsive, resilient,
elastic, message-driven
Microservices (strategy)
» bounded contexts (DDD),
event sourcing, CQRS,
eventual consistency
Tools (implementation)
» Typesafe Reactive Platform
(Play, Akka, Spark)

29. Heritage system

30. Future system

31. Clustered microservices

32. Ecosystem
plus:
» service registry
» service discovery
» architecture visualization
» security

33. Implementation?

34. Typesafe Reactive Platform

35. Message-driven
» distribution
» location transparency
» isolation

36. Resilient
» supervision

37. Resilient
» dedicated separate error
channel

38. Elastic
» scale up
» async
» non-blocking
» scale out
» immutable data
» share nothing

39. Responsive
» responsive to events, load,
failure, users
» embrace new concepts and
patterns
» cluster computing
» distribution of data
» new patterns like
circuit breakers

41. Whatwe offer

42. Commercialfeatures
» Akka Split Brain Resolver
» Akka 2.3 Cluster Support for Docker
» Play User Quotas
» Play SOAP

43. ProjectSuccess Subscription
» Certified build
» Compatibility verifications
» Security alerts
» Binary updates
» Long-term support
» Legal protection

44. Typesafe ConductR
ManageTypesafe Reactive Platformapplicationsacrossacluster

45. Typesafe Monitoring
Knowexactlywhatyour Reactive system is doing

46. Thankyou!
Visit https://www.typesafe.com/products/typesafe-
reactive-platform to get started
Contactinfo
» Twitter: @kvnwbbr
» Email: kevin.webber@typesafe.com