1. Monoliths, Microservices, Events,
Functions – What it takes to go through
the transformation
Dilleswara R Anupoju | Principal Engineer | Comcast
October 7–10, 2019
Austin Convention Center

2. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 2
Multi-cloud
~1.7k
~22k
~46k
2
Application Instances
Built to scale across multiple clouds
Applications
From Billing, Provisioning to Xfinity Virtual Assistant
Slack Community Members
Crowd-sourced collaboration and innovation
Unified Developer Experience
Don’t choose! Same experience across any cloud
Cutting-edge Platforms
Cloud Foundry & APEKS (K8s)

3. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3
Pillars of Productivity
People
Process
Productivity
Architecture
Technology

4. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 4
Monoliths to 𝝁Services
Almost all the successful microservice
stories have started with a monolith
that got too big and was broken up.
- Martin Fowler

5. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5
Decomposing Legacy Apps
CaaS FaaS
LEGACY APPS
PaaS

6. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 6
Monoliths vs Microservices
PRODUCT
S
CUSTOME
RS
ORDERS
PRODUCT
S
CUSTOME
RS
ORDERS
CUSTOMERS
PRODUCT
S
CUSTOME
RS
ORDERS
ORDERS
PRODUCTS

7. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 7
Microservices – Key Considerations
• How to decompose the system into micro services?
• Should this be single database/repo per 𝝁Service?
• How to manage distributed transactions that span across multiple-services ?
• How do these Services Interact?
• How to handle partial failures (service/network) ?

8. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Partition into Microservices

9. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 9
Domain Modelling - DDD
An important concept is dependencies,
on outer layer can see an inner layer
but an inner layer has no knowledge
of any outer layer.
Image Courtesy: https://threedots.tech

10. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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Partition into Microservices
• Domain
• Bounded Context
• Transaction boundaries
Domain
Core Generic Support
Context

11. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Handle Partial failures

12. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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Distributed Architecture – Design for failure
Load Balancer
A2A1B

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Distributed Architecture
• Multiple AI per micro-service ( > 3)
• Multiple AZ within a region / data center
• Multiple regions/dc
• Multiple cloud / platform
• Autoscaling capabilities
• Application Health Checks
• Circuit breakers

14. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Microservices Interaction

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Microservices Interaction (Sync)
Service
Mes(s)h
Synchronous calls
considered harmful
- Martin Fowler
Image Courtesy: https://threedots.tech

16. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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Microservices Interaction (Async)
Id Aggregate Id Aggregate Type Type Payload Timestamp
100 200 Order OrderCreated {“data”: {}} 10-09-19T01:00:00Z
101 201 Order OrderApproved {“data”: {}} 10-09-19T01:01:10Z
102 202 Order OrderShipped {“data”: {}} 10-09-19T01:02:20Z
Events
 Immutable
 Strongly typed
 Component/Service level

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Microservices + Events
CUSTOMERS
ORDERS
PRODUCTS
Events
REVIEWS
PAYMENTS
SHIPMENTS

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CQRS - Command Query Responsibility Separation
Read / Write Service Model
 Complexity
 Scale /GET
/POST
/PUT
/DELETE
PipesandFilters
 Immutable
 Simple data
 With-in Service
Queries

19. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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Further Reading
• https://martinfowler.com/articles/serverless.html
• https://martinfowler.com/articles/microservices.html
• https://www.infoq.com/news/2014/10/ddd-onion-architecture/
• https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html
• https://github.com/knative/docs

20. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Q & A

21. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Thank You