Monoliths and Microservices
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Should you choose a microservices architecture over a monolith? What are the pros and cons in reality.
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Monoliths and Microservices
- 2. Vanity slide • Senior software engineer @ TomTom • http://blog.bozho.net • http://techblog.bozho.net • http://twitter.com/bozhobg • some other stuff...
- 4. Monoliths • single deployment • single runtime • single codebase • interaciton between classes is most often syncrhonous • most often every layer is in a separate package
- 5. Microservices • many small modules with specific functionality • more than one codebase • every microservice is a separate deployment • every microservices has its own DB • communication with web- services/protobuf/thrift/… • ensures module independence
- 6. Monoliths vs microservices Source: Martin Fowler
- 7. Downsides of monoliths…? • “spaghetti”, “big ball of mud” • you need a full redeploy • programmers often violate the layer boundaries • classes often “leak” their implementation • hard to work with multiple teams • hard to manage
- 8. Benefits of Microservices..? • modelled around the business domain • deployment automation culture • hides implementation details • decentralization • option to use multiple languages • separate deployment, separate monitoring • isolating problems
- 10. Downsides of monoliths..? • “spaghetti”, “big ball of mud” • if you write bad code, architecture doesn’t matter • you need a full redeploy • so? It’s automated anyway • programmers often violate layers • see. 1 • classes “leak” their implementation • see 1
- 11. Benefits of microservices..? • all of them can be achieved with a monolith • modelled around the business domain • yes • deployment automation culture • nothing stops automated deployments of a monolith • hides implementation details • OOP 101
- 12. Benefits of microservices..? • separate deployment, separate мониторинг • monitoring of classes/components/layers with tools like statsd • isolating problems • when has a single exception broken your server? • if a whole machine dies – you have an HA cluster • graceful degradation - feature toggle in monolith
- 13. Microservices...downsides • network overhead • transaction coordination • you don’t have transaction? Congratulations. • need for duplicating common data • and keeping it in sync • complicated deployment pipeline • dependencies
- 14. Microservices...should we? “…don’t even consider microservices unless you have a system that’s too complex to manage as a monolith. The majority of software systems should be built as a single monolithic application. Do pay attention to good modularity within that monolith, but don’t try to separate it into separate services” Martin Fowler
- 16. “the design thinking and decomposition strategy required to create a good microservices architecture are the same as those needed to create a well structured monolith” Simon Brown
- 17. The middle way Source: Simon Brown
- 18. How to write monoliths • package by layer (small projects) • with sub-packages by component • package by components • logically the same as microservices, without the cons • one or several projects with module dependencies • project jigsaw - modules • good OOP • interfaces, encapsulation, composition, etc.
- 19. More best practices • Continuous delivery, automation • High availability • Log collection • Monitoring
- 20. Microservices use cases • multiple teams • short-lived, spawned workers • memory or CPU intensive parts • to ease development
- 21. Но като цяло... • common sense • добри практики • качествен код • не се доверявайте на “модерното” • не се “наархитектурчвайте” • a.k.a. KISS • загубите може да са повече от евентуалните ползи
- 23. Thank you!