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What is a microservice? Chris O’Dell Agile on the Beach 2021

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@ChrisAnnODell About Me Senior Software Engineer 15+ years experience (inc: Monzo, Contino, JustEat, and 7digital) Speaker, Author, and Course Tutor

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What is a microservice? Chris O’Dell Agile on the Beach 2021

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@ChrisAnnODell Microservice architecture – a variant of the service-oriented architecture (SOA) structural style – arranges an application as a collection of loosely-coupled services. In a microservices architecture, services are fine-grained and the protocols are lightweight. - Wikipedia

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@ChrisAnnODell Where did the name come from? https://en.wikipedia.org/wiki/Microservices#History

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@ChrisAnnODell According to this paper https://arxiv.org/abs/1606.04036

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@ChrisAnnODell According to this paper https://arxiv.org/abs/1606.04036

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@ChrisAnnODell According to James Lewis & Martin Fowler https://martinfowler.com/articles/microservices.html

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@ChrisAnnODell According to James Lewis & Martin Fowler https://martinfowler.com/articles/microservices.html#footnote-etymology

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@ChrisAnnODell It’s everywhere! https://www.dataversity.net/a-brief-history-of-microservices/ https://www.infoq.com/presentations/microservices-roundtable-2020/ https://devopedia.org/microservices

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@ChrisAnnODell … so I contacted James

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@ChrisAnnODell Bruce Eckel

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@ChrisAnnODell Bruce Eckel

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@ChrisAnnODell Bruce Eckel

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@ChrisAnnODell Bruce Eckel Jimmy Nilsson

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@ChrisAnnODell Jimmy Nilsson

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What is a microservice? Chris O’Dell Agile on the Beach 2021

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@ChrisAnnODell Microservice architecture – a variant of the service-oriented architecture (SOA) structural style – arranges an application as a collection of loosely-coupled services. In a microservices architecture, services are fine-grained and the protocols are lightweight. - Wikipedia

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@ChrisAnnODell Service Oriented Architecture (SOA) https://www.flickr.com/photos/davegray/6865783407/

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@ChrisAnnODell SOA Principles Service Contract Composable Autonomy Stateless Reusable Loose Coupling Black boxes Granular Normalised Long lived

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@ChrisAnnODell Simple Object Access Protocol (SOAP) https://flylib.com/books/en/2.439.1.22/1/

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@ChrisAnnODell Distributed Computing https://www.sciencedirect.com/topics/computer-science/distributed-computing

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@ChrisAnnODell Modular Programming https://resources.altium.com/p/product-design-trends-in-2020-modular-hardware-vs-modular-software

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@ChrisAnnODell Microservices Modular Programming SOA Distributed Computing

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@ChrisAnnODell Back to Venice...

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@ChrisAnnODell Struggling with the maintenance of large codebases

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@ChrisAnnODell Instead of large things, why not make small things?

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Multiple Discovery

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@ChrisAnnODell Invention of the Telephone

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@ChrisAnnODell Invention of the Telephone

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Multiple Discovery Of Microservices

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@ChrisAnnODell The “workshop” in Venice http://2012.33degree.org/ James Lewis

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@ChrisAnnODell Alternative universe? Fred George https://www.slideshare.net/fredgeorge/micro-service-architecure

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@ChrisAnnODell Alternative universe? Adrian Cockcroft https://www.slideshare.net/adrianco/netflix-velocity-conference-2011

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So, what is a microservice?

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@ChrisAnnODell So, what is a microservice? https://twitter.com/ChrisAnnODell/status/1423618814390964224

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@ChrisAnnODell So, what is a microservice? https://twitter.com/bascule/status/1423706101531381767

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@ChrisAnnODell So, what is a microservice? https://twitter.com/graham_r_smith/status/1423627130022334466

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@ChrisAnnODell So, what is a microservice? https://twitter.com/DivZero_/status/1423843330169794561

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@ChrisAnnODell Let’s go back to wikipedia...

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@ChrisAnnODell There is no single definition for microservices. - Wikipedia

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@ChrisAnnODell There is no single definition for microservices. A consensus view has evolved over time in the industry. - Wikipedia

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@ChrisAnnODell There is no single definition for microservices. A consensus view has evolved over time in the industry. Some of the defining characteristics that are frequently cited include: - Wikipedia

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@ChrisAnnODell 1. Processes that communicate over a network to fulfil a goal using technology-agnostic protocols such as HTTP

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@ChrisAnnODell 2. Services are organized around business capabilities

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@ChrisAnnODell 3. Services can be implemented using different programming languages, databases, hardware and software environment, depending on what fits best

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@ChrisAnnODell 3. Services can be implemented using different programming languages, databases, hardware and software environment, depending on what fits best.

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@ChrisAnnODell 4. Services are small in size, messaging-enabled, bounded by contexts, autonomously developed, independently deployable, decentralized and built and released with automated processes

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@ChrisAnnODell Myths

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@ChrisAnnODell So, what is a microservice? https://twitter.com/Lilobase/status/1423641694856269828

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@ChrisAnnODell You need to use kubernetes Myth

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@ChrisAnnODell You need containers Myth

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@ChrisAnnODell You need to be on the Cloud Myth

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@ChrisAnnODell

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@ChrisAnnODell You need to use gRPC Myth

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@ChrisAnnODell You need to be a startup Myth

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Cultural Changes

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@ChrisAnnODell So, what is a microservice? https://twitter.com/kieranmch/status/1423619285155565570

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@ChrisAnnODell 4. Services are small in size, messaging-enabled, bounded by contexts, autonomously developed, independently deployable, decentralized and built and released with automated processes

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@ChrisAnnODell 4. Services are small in size, messaging-enabled, bounded by contexts, autonomously developed, independently deployable, decentralized and built and released with automated processes

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@ChrisAnnODell 4. Services are small in size, messaging-enabled, bounded by contexts, autonomously developed, independently deployable, decentralized and built and released with automated processes

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@ChrisAnnODell 4. Services are small in size, messaging-enabled, bounded by contexts, autonomously developed, independently deployable, decentralized and built and released with automated processes

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@ChrisAnnODell 4. Services are small in size, messaging-enabled, bounded by contexts, autonomously developed, independently deployable, decentralized and built and released with automated processes

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Pitfalls

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@ChrisAnnODell So, what is a microservice? https://twitter.com/malk_zameth/status/1423637160381624330

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@ChrisAnnODell Underestimating the Increased Operability Costs Pitfalls

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@ChrisAnnODell Underinvestment in build and deployment Pitfalls

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@ChrisAnnODell Tight coupling between microservices Pitfalls

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Have we taken it too far?

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@ChrisAnnODell A web https://twitter.com/JackKleeman/status/1190354757308862468

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@ChrisAnnODell Adding in groupings https://twitter.com/JackKleeman/status/1190973434601324544

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@ChrisAnnODell Swing back to monoliths?

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@ChrisAnnODell Continue to evolve Modular Programming SOA Microservices Distributed Computing ?

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@ChrisAnnODell So, what is a microservice?

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@ChrisAnnODell So, what is a microservice? https://twitter.com/da5is/status/1423635467145203717

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CREDITS: This presentation template was created by Slidesgo, including icons by Flaticon, and infographics & images by Freepik Do you have any questions? Chris O’Dell @ChrisAnnODell THANKS