Lessons Learned: Migrating an N-tier web application to microservices with NServiceBus

by Roy Cornelissen

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Migrating N-tier applications to µServices Lessons learned Roy Cornelissen Lead Consultant @ Xpirit

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Services as a network of independent parts

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It depends

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If you expect (or know) that your system is complex and/or has to scale in multiple dimensions

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http://martinfowler.com/bliki/MicroservicePremium.html

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User interface Views, ViewModels, DTO’s over HTTP Business layer ORM, business rules, mapping to DTO Database

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Big Ol’ Database Integration Layer Service Layer Presentation Layer Silverlight Planning UI Integration Service WCF Application Logic Webservices

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Layers

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Remove a field here

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Big Ol’ Database Integration Layer Service Layer Presentation Layer Silverlight Planning UI Integration Service WCF Application Logic Webservices horizontal Common Budget Payment Schedule

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temporal response

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temporal

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Reliability Scalability Stability

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RPC Throughput Load

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Services keep their own state Events are used to notify changes Each service will have its own database Services use events to replicate data

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Sales Billing Shipping SubmitOrder OrderAccepted OrderBilled OrderShipped

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Messaging

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applying async

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RPC Throughput Load Messaging

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get there?

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step

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Find module boundaries and define business events…

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…and publish these events from existing code

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Message Bus Big Ol’ Database Legacy logic Common Budget Payment Schedule Presentation Layer Budget UI Scheduling UI Organization UI Payment UI Budget Webservice Scheduling Webservice Organization Webservice Payment Webservice

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Develop new features, on top of these events

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Think about UI composition

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Migrate existing logic to the background

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Split up the database

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Service endpoints Presentation Layer Budget Scheduling Payment Organization Budget UI Scheduling UI Organization UI Payment UI Budget Webservice Scheduling Webservice Organization Webservice Payment Webservice Message Bus

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1. Define boundaries and publish events 2.Use these events to develop new features 3.Think about composite UI 4.Migrate existing logic to background 5.Split up the database

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learned Microservices

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Keep your transactions on a diet Design with parallelism in mind {Tx} {Tx} {Tx}

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Prepare to make concessions at first Clean up later learned

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Messaging makes totally different use cases possible Requires a new mindset for everyone learned

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Take your time Prepare to take ~1 year for a transition learned

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More moving parts means more complexity Evaluate whether you really need microservices learned

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Get access to 2 full days of Udi Dahan's Advanced Distributed Systems Design video course. Sign up here: http://go.particular.net/DutchTechDays Access code: HIHIWE Expiration date: 15/6/2015

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@roycornelissen roycornelissen.wordpress.com [email protected] bit.ly/XpiritMagazine

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