Collection of software architecture patterns we applied at Nubank to enhance the reliability of our systems. No novelty is claimed, many of the patterns are well known and documented in the software engineering literature.

1. Gustavo Barrancos (@gbarrancos)
Rafael Ferreira (@rafaeldff)
Cloud Reliability
Patterns @ Nubank

2. “Nu Minimal Keynote Template” © Nu Bank - 05.01.2014 2
Complex systems
usually operate in
failure mode
John Gall

3. Growth
3

4. Microservices
4

5. 5
Asynchronous
Messaging

6. Asynchronous Messaging
6
• Decoupling
• Pub/Sub
• Fault Isolation
• Load Distribution
• Operability

7. Asynchronous Messaging
7
• Concerns
• Complexity
• Harder to test
• Single Point of Failure

8. Asynchronous Messaging
8
Apache Kafka

9. 9
Blue - Green
Deployments

10. Blue-Green Deployments
10
“A release technique
that reduces
downtime and risk
by running two
identical production
environments: Blue
and Green”
https://docs.cloudfoundry.org/devguide/deploy-apps/blue-green.html

11. Blue-Green Deployments - AWS Autoscaling Groups
11
Elastic Load Balancer

12. Blue-Green Deployments - AWS Elastic Network
Interface
12

13. 13
Pervasive Monitoring

14. Pervasive monitoring - Systems Health Metrics
“Nu Minimal Keynote Template” © Nu Bank - 05.01.2014 14

15. 15
Riemann
http://www.riemann.io

16. Pervasive monitoring - Riemann
16

17. 17
Pervasive Monitoring - Business Metrics

18. Pervasive Monitoring - Errors
18

19. 19
Traceability

20. Traceability - log all I/O
“Nu Minimal Keynote Template” © Nu Bank - 05.01.2014 20
2016-03-28T17:50:23.991Z [ACQUISITION] INFO - {:cid "DEFAULT.
6DTVD.PUQPE.EQ36K.4XQGO", :log :out-request, :method :get, :uri
“https://prod-customers.nubank.com.br/api/customers/
21ede21-1a6b-44dc-b731-f58279edd421"}
2016-03-28T17:50:23.993Z [CUSTOMERS] INFO - {:cid "DEFAULT.
6DTVD.PUQPE.EQ36K.4XQGO.WHBVH", :log :in-request, :method :get,
:path "/api/customers/:id"}

21. Traceability - Correlation Id
“Nu Minimal Keynote Template” © Nu Bank - 05.01.2014 21

22. 22
Healthchecks

23. Healthchecks
23
Elastic Load Balancer

24. Healthchecks - Heartbeats
24
Elastic Load Balancer

25. 25
Deadletters

26. Deadletters
26
Elastic Load Balancer

27. 27
Circuit Breakers

28. Circuit Breakers
28
Elastic Load Balancer

29. 29
Questions?
(we are hiring! http://nubank.workable.com)