This document discusses using Akka for IoT applications. It describes a demo application called Where on Earth (WoE) that uses Akka microservices to handle IoT device telemetry and state changes in a reactive, elastic and resilient manner. The WoE application demonstrates using Akka Cluster to distribute services, CQRS to separate commands from queries, and event sourcing with Akka Persistence to maintain state. It estimates future IoT data rates could reach thousands of state changes per second, showing the need for scalable and high performance architectures like Akka.

1. 1

2. Why Akka for IoT?
TechRepublic
How Tesla uses open source to generate resilience in
modern electric grids
https://www.techrepublic.com/article/how-tesla-uses-open-source-to-generate-resilience-in-modern-electric-grids/
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actor
Digital Twins

3. Where on Earth (WoE)
Akka Microservices IoT Demo Application
Live Demo IoT

4. WoE Akka Microservice Application
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woe-sim woe-twin

5. WoE Akka Microservice Application
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woe-sim woe-twintelemetry
HTTP/2
gRPC
(RSocket)

6. WoE Akka Microservice - Reactive, Elastic, Resilient
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woe-sim woe-twin
Akka Cluster Akka Cluster

7. WoE Akka Microservice - Reactive, Elastic, Resilient
7
woe-sim woe-twin

8. WoE Akka Microservice - Reactive, Elastic, Resilient
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woe-sim woe-twin

9. WoE Akka Microservice - Reactive, Elastic, Resilient
9
woe-sim woe-twin

10. WoE Akka Microservice - Reactive, Elastic, Resilient
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woe-sim woe-twin

11. CQRS
Command Query Responsibility Segregation
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12. 12
CQRS

13. 13
CQRS
Akka HTTP gRPC

14. 14
CQRS
Akka Persistence

15. 15
CQRS
Akka Projection

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CQRS
Akka Projection
Akka HTTP gRPC
Akka Persistence

17. Why CQRS?
Increased Throughput
Reduce Contention
Optimized Data Models
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Why Akka & CQRS?
Stateful, not Stateless
Hot State, not Cold State
actor

18. WoE Akka Microservice Application - CQRS
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woe-sim woe-twin
Journal(eventlog)
Journal(eventlog)
Projection(view)

19. Where on Earth
Akka Microservices IoT demo application
Live Demo - Projection IoT

20. WoE Code Review
https://github.com/mckeeh3/woe-sim
https://github.com/mckeeh3/woe-twin
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21. How Fast is Fast Enough?
Amazon average sales / second in 2020? $10,000
Assume average order size $50 - 10,000 / 50 = 200
~200 orders / second
IoT devices - 1,000,000
Telemetry message rate / IoT device - 1 / minute
Average device state change every 10 minutes - 1,000,000 / 60 / 10 = 1,667
~1,667 IoT state changes / second
Where will we be in 2025? 2030?...
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22. Q & A
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23. Thank You!
@mckeeh3
https://www.linkedin.com/in/mckeehugh/