Going Reactive in the Land of No

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Going Reactive in the Land of No or How to build modern reactive systems for the modern world Sean Walsh, co-author of “Reactive Application Development” and Field CTO at Lightbend and former CEO of Reactibility, shares lessons learned in helping large enterprises convert their monoliths into distributed microservices.

Technologie

Going Reactive in the Land of No
Sean Walsh | Field CTO
(@SeanWalshEsq)

reactivemanifesto.org
Reactive: the architecture for modern, scalable
applications

• Exploding user bases
• Cheaper and more available hardware
• IoT
• Science

Something was standing between my
large health and wellness client and their
customers. That something was about to
put them out of business.

A Monolith
• Expensive to maintain, lack of in-house capability due to
repeated outsourcing
• Non distributed
• Dependency on a custom and very expensive Oracle
installation
• Ops heavy rather than developer heavy
• Effectively…

Late 2014 - A false start
•Not “all in”
•Large team engaged anyway
•Missing real requirements
churn…

Let’s start over but this time we do it wrong
different, we do it my way! - That One Guy
Same leadership
churn churn churn…
Sr Director No

Spring Boot
Groovy Gpars Actors
Gradle
SBT
Maven
Java
Scala
Akka
AnsibleGroovy

Department of Redundancy Department
population Sean and Nicholas
a final attempt at purity - one sprint to
prove it

Finally the Light
• Full company engagement (even Oprah!)
• New, modern CTO working in close partnership with my team
and others
• Real requirements and mandatory Ops support
• Good news and bad news

No No Noooo
• Still risk adverse, CQRS and Event Sourcing sounded scary
so NO
• Ops was now devops and guess that their favorite word
was?
• NO clustering, NO Cassandra, NO Kafka

• And then were three - Sayre joins the team
• They let us use Play/Akka/Cassandra
• We had customers!
• Core software was all rebuilt from the ground up

Accomplishments
• Unheard of velocity in “core” - Play - simplicity
• Core fully production ready by November of 2015
• 12 microservices - billion+ transactions per day capable
• Modern aggregated monitoring and logging provided
incredibly quick root cause analysis
• Never before seen resilience and application stability

A Bit too much Compromise
• Stateless applications easier to reason about at first but
cost plenty in the long run
• Perceived investment and value in Cassandra
• Final waterfall caused some costly non-DDD design
• Devops spaghetti in the form of Ansible scripts
• Poor mans CQRS and Event Sourcing
• And oh man no Kafka and now look…

Other Lessons Learned
• Legacy, immature mobile, other contaminating feeds
• Continuous delivery and deployment but tricky due to
service coupling
• Migration not as an afterthought
• Oh and don’t ever give a developer both a load test
script and access to production

Strive for Yes
• Don’t roll your own
• Need for clustered middleware
• More emphasis on application tier
• Need for durable pub/sub
• Simpler devops abstractions - orchestration - dcos
• Less code invasive monitoring
• Fast data pipeline for anti-corruption

1) The company is now on the same
playing field as the disruptors
2) What was a monolith, now a
platform for creative new product
ideas
3) Thanks to the above and a
famous 40 Lb weight loss the stock
is starting to rebound

Build modern systems for the modern
world
www.lightbend.com

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1. Going Reactive in the Land of No Sean Walsh | Field CTO (@SeanWalshEsq)

2. reactivemanifesto.org Reactive: the architecture for modern, scalable applications

3. Forces

4. • Exploding user bases • Cheaper and more available hardware • IoT • Science

5. Something was standing between my large health and wellness client and their customers. That something was about to put them out of business.

6. A Monolith • Expensive to maintain, lack of in-house capability due to repeated outsourcing • Non distributed • Dependency on a custom and very expensive Oracle installation • Ops heavy rather than developer heavy • Effectively…

7. A Big Ball of Mud

8. Late 2014 - A false start •Not “all in” •Large team engaged anyway •Missing real requirements churn…

10. Early 2015

11. Let’s start over but this time we do it wrong different, we do it my way! - That One Guy Same leadership churn churn churn… Sr Director No

12. Spring Boot Groovy Gpars Actors Gradle SBT Maven Java Scala Akka AnsibleGroovy

13.

14. Department of Redundancy Department population Sean and Nicholas a final attempt at purity - one sprint to prove it

15.

16. Finally the Light • Full company engagement (even Oprah!) • New, modern CTO working in close partnership with my team and others • Real requirements and mandatory Ops support • Good news and bad news

17. No No Noooo • Still risk adverse, CQRS and Event Sourcing sounded scary so NO • Ops was now devops and guess that their favorite word was? • NO clustering, NO Cassandra, NO Kafka

18. • And then were three - Sayre joins the team • They let us use Play/Akka/Cassandra • We had customers! • Core software was all rebuilt from the ground up

19. Accomplishments • Unheard of velocity in “core” - Play - simplicity • Core fully production ready by November of 2015 • 12 microservices - billion+ transactions per day capable • Modern aggregated monitoring and logging provided incredibly quick root cause analysis • Never before seen resilience and application stability

20. A Bit too much Compromise • Stateless applications easier to reason about at first but cost plenty in the long run • Perceived investment and value in Cassandra • Final waterfall caused some costly non-DDD design • Devops spaghetti in the form of Ansible scripts • Poor mans CQRS and Event Sourcing • And oh man no Kafka and now look…

21. THIS

22. What we really needed

23. Other Lessons Learned • Legacy, immature mobile, other contaminating feeds • Continuous delivery and deployment but tricky due to service coupling • Migration not as an afterthought • Oh and don’t ever give a developer both a load test script and access to production

24. Strive for Yes • Don’t roll your own • Need for clustered middleware • More emphasis on application tier • Need for durable pub/sub • Simpler devops abstractions - orchestration - dcos • Less code invasive monitoring • Fast data pipeline for anti-corruption

25. 1) The company is now on the same playing field as the disruptors 2) What was a monolith, now a platform for creative new product ideas 3) Thanks to the above and a famous 40 Lb weight loss the stock is starting to rebound

26. Build modern systems for the modern world www.lightbend.com

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