Serverless CQRS in Azure!
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The CQRS pattern enables you to build highly scalable, distributed and event-driven applications. Microsoft Azure contains all the serverless building blocks you need to take advantage of the CQRS pattern. In this session, we’re going to transform a monolithic web app into a modern cloud application, that easily handles peak loads and offers great flexibility. Expect architectural guidance, cost-effective designs and live demo’s.
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Serverless CQRS in Azure!
- 1. Serverless CQRS in Azure! Toon Vanhoutte https://be.linkedin.com/pub/toon-vanhoutte/6/276/84b
- 2. Toon Vanhoutte Serverless CQRS in Azure!
- 3. Nice to meet you Toon Vanhoutte Lead Architect @ Codit Belgium Microsoft Azure MVP @toonvanhoutte toonvanhoutte.wordpress.com www.linkedin.com/in/toon-vanhoutte
- 4. Who we are Customers Entities 2000 Belgium 2004 France 2013 Portugal 2016 Switzerland 2016 UK 2016 The Netherlands 2017 Malta 150 worldwide
- 5. The thing we do
- 6. Agenda • An Introduction to CQRS • Serverless Technologies in Azure • Use Case: Optimize a Webshop • Conclusion 6
- 7. An introduction to CQRS
- 8. CRUD Architecture Proven and simple design
- 9. Command Query Responsibility Segregation Dealing with complex domain models
- 10. Command Query Responsibility Segregation Dealing with high performing applications
- 11. Commands vs Queries Write Reliable Sync / Async Transactional Persistent Commands Queries Read Volatile Sync Non Transactional In Memory Fast Fast
- 13. Pizza as a Service
- 14. 14 Serverless Technology Options Azure Functions “Code triggered by events” Azure Logic Apps “Workflows triggered by events” Azure Event Grid “Serverless event routing service” Azure Service Bus “Reliable messaging platform”
- 15. Pricing Model Security Runtime Monitoring Deployment State Networking Connectivity Exception Handling Developer experience Azure Functions Azure Logic Apps
- 16. Azure Functions Azure Logic Apps Preferred option for complex synchronous request/response calls. Preferred option for asynchronous fire-and- forget messaging. Azure Functions perfectly extends Azure Logic Apps.
- 17. Command Query Report TransferNotification MeasurementAssignment Job Update Request Trace Handover Azure Service Bus Azure Event Grid © Clemens Vasters
- 18. Azure Service Bus Azure Event Grid Command Query ReportTransfer Notification Measurement Assignment Job Update Request Trace Handover Passing Intents Reporting Facts Messaging Eventing Discrete Series © Clemens Vasters
- 19. Azure Service Bus Azure Event Grid Passing Intents Reporting Facts Messaging Eventing Discrete Series “PriceUpdated” “OpportunityWon” “InvoiceBooked” Temperature stream Telemetry data Audit trail “CreateOrder” “BookHotel” “UpdateStock” © Clemens Vasters
- 20. Use Case
- 21. Pizza Antonio Find out how CQRS will save Antonio’s business!
- 22. Pizza Antonio Website € 10€ 12€ 11 Submit Query Command
- 23. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase Very good pizza’s Customers get errors when ordering pizza during peak hours
- 24. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase Customers don’t get any errors anymore The orders don’t make it to the database, so no pizza
- 25. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase All orders make it to the database Polling during quiet hours is rather expensive, so more expensive pizza’s
- 26. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase Cheaper polling mechanism, so again sharper prices No flexible way to send order confirmations through email
- 27. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase Flexible extension points for e.g. emails Two different URL’s and security keys for the website
- 28. Pizza Antonio QueryCommand SQLDatabase GetProducts CreateOrder AzureFunctionProxy Uniform API for website Loading products on the website is extremely slow during peak hours
- 29. Pizza Antonio QueryCommand SQLDatabase GetProducts CreateOrder AzureFunctionProxy Fast responsive times on the website No flexible way to update products on external food delivery services
- 32. Conclusion
- 33. CQRS is a proven design pattern! It exists in many different variations Azure Function Proxy SQL Database QueryCommand Sentinet SQL Database QueryCommand Azure API Mgmt SQL Database QueryCommand Cache
- 34. Lessons learned Azure Functions Azure Event Grid Consumption plan results in cold starts, also for function proxies! Solution: • Keep it warm (5 min) • App Service Plan • Pre-compiled functions Event Grid puts responsibility for sequencing at receive side! Solution: • Use it wisely • Consider Azure Service Bus if sequencing is required
- 35. Architectural Advise on CQRS Do not overengineer! Performance Flexibility Scalability Advantages Idempotence Resiliency Eventual Consistency Challenges Complexity Maintenance Monitoring Disadvantages Apply CQRS carefully on specific parts of the solution!
- 36. Thank you! Keep in touch. @toonvanhoutte toonvanhoutte.wordpress.com www.linkedin.com/in/toon-vanhoutte
Editor's Notes
- From a DDD perspective, where the business complexity requires two separate models for read and write models. Eg one database with write against database tables and reads done based on views that are optimized for the UI
- Improve performance, scalability and flexibility
- Improve performance, scalability and flexibility