Microservice Everything Redux Eng

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 1/98 MICROSERVICES, MICROSERVICES, MICROSERVICES EVERYWHERE MICROSERVICES EVERYWHERE Jakub Marchwicki [@kubem]

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 2/98 @kubem ~ http://jakub.marchwicki.pl the 5 why’s of microservices the 5 why’s of microservices Microservices? Microservices? Microservices? Microservices? Microservices? Why? Why? Oh, why? Oh dear God, why? Damn it! Why?

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 3/98 Software engineer Chief Mob O cer Jakub Marchwicki <@kubem> http://jakub.marchwicki.pl

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 4/98 @kubem ~ http://jakub.marchwicki.pl microservices, how it all started? microservices, how it all started? All names, characters, and incidents portrayed in this story are ctitious. No identi cation with actual persons (living or deceased), places, and buildings is intended or should be inferred.

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 5/98 @kubem ~ http://jakub.marchwicki.pl on day one there was a lonely architect sitting on day one there was a lonely architect sitting

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 6/98 @kubem ~ http://jakub.marchwicki.pl in a tower made of ivory in a tower made of ivory sitting in an uncertainty and sadness

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 7/98 @kubem ~ http://jakub.marchwicki.pl and the architect said and the architect said

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 8/98 @kubem ~ http://jakub.marchwicki.pl let there be µservices let there be µservices

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 9/98 @kubem ~ http://jakub.marchwicki.pl let there be small modules let there be small modules which have only a single reason to change

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 10/98 @kubem ~ http://jakub.marchwicki.pl let the modules communicate let the modules communicate over well de ned interfaces

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 11/98 @kubem ~ http://jakub.marchwicki.pl let the output of one module let the output of one module becomes the input of the other

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 12/98 @kubem ~ http://jakub.marchwicki.pl and the architect saw it was good and the architect saw it was good

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 13/98 @kubem ~ http://jakub.marchwicki.pl and the architect called it and the architect called it a distributed system

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 14/98 @kubem ~ http://jakub.marchwicki.pl and developers seen it and developers seen it and it was good

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 15/98 @kubem ~ http://jakub.marchwicki.pl and there was evening, and there was morning and there was evening, and there was morning (Genesis. 1, 1-25)

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 17/98 @kubem ~ http://jakub.marchwicki.pl microservices microservices — James Lewis and Martin Fowler “the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 19/98 @kubem ~ http://jakub.marchwicki.pl µservices µservices Small business domain Independent; independently deployed Running in it’s own process Managing it’s data Loosely integrated using common communication protocols

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 21/98 monolith are bad - mmkey?? monolith are bad - mmkey??

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 22/98 @kubem ~ http://jakub.marchwicki.pl microservices are good microservices are good Clean code Single responsibility modules Faster than monoliths Easier to manage Easier to scale Docker, Docker, Docker, Docker potentialy faster to deploy, works faster independent teams, independent codebases at this point we should at least mention Docker

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 23/98 microservices are good - mmmkey? microservices are good - mmmkey?

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 24/98 @kubem ~ http://jakub.marchwicki.pl (… ) collection of task-oriented or dedicated systems that pool their resources and capabilities together to create a new, more complex system which offers more functionality and performance than simply the sum of the constituent systems

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 25/98 @kubem ~ http://jakub.marchwicki.pl system of systems system of systems (… ) collection of task-oriented or dedicated systems that pool their resources and capabilities together to create a new, more complex system which offers more functionality and performance than simply the sum of the constituent systems

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 27/98 @kubem ~ http://jakub.marchwicki.pl so what can possibly go wrong? so what can possibly go wrong?

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 30/98 // Exibit A +-------------+ | | | Resources | | service | | | +-------------+ //

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 31/98 // Exibit A +------------------+ +-------------+ | | | | | Access control | | Resources | | | | service | +------------------+ | | +-------------+ //

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 34/98 // Exibit A +------------------+ +-------------+ | | | | | Access control | | Resources | | | | service | +------------------+ | | +-+-------+---+ ^ | | | | | +----------------+ | | | | | | | Users | | | (2) | repository | | +-----------> | | | +----------------+ (1) + //

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 35/98 // Exibit A +------------------+ +-------------+ | | | | | Access control | | Resources | | | | service | +------------------+ | +<---------+ +-+-------+---+ (3) | ^ | | | | | | | +----------------+ | | | | | | | Users | | | (2) | repository | | +-----------> | | | +----------------+ (1) + //

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 36/98 // Exibit A +------------------+ +-------------+ | | | | (4) | Access control | | Resources +------------>+ | | service | +------------------+ | +<---------+ +-+-------+---+ (3) | ^ | | | | | | | +----------------+ | | | | | | | Users | | | (2) | repository | | +-----------> | | | +----------------+ (1) + //

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 37/98 // Exibit A +------------------+ +-------------+ | | | | (4) | Access control | | Resources +------------>+ | | service | +------------------+ | +<---------+ +-+-------+---+ (3) | ^ | | | | | | | | | | +----------------+ | | | | | | | | | Users | | | | (2) | repository | | | +-----------> | | | | +----------------+ (1) | + | (5) v //

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 38/98 @kubem ~ http://jakub.marchwicki.pl microservices journey microservices journey

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 39/98 @kubem ~ http://jakub.marchwicki.pl microservices journey microservices journey — Christopher Alexander “A Piecemeal Growth is the process of building something a step at a time. Each step consists of evaluating the current system, deciding what should be done next (what should be fixed or improved) and then adding a piece or making a change.

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 40/98 @kubem ~ http://jakub.marchwicki.pl a scoring engine EXIBIT B EXIBIT B -- 2009

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 41/98 +-----------------------------------------------+ | | | +-----------------------------------+ | | | | | | | Boundary: SOAP | | | | | | | +-----------------------------------+ | | | | | | | EJB | | | | | | | +-----------------------------------+ | | | | | | +--------+ +-------+ +----------+ | | | | | | | | | | | JAX-WS | | JPA | | DROOLS | | | | | | | | | | | +--------+ +-------+ +----------+ | | | | | | JBoss 4.2.x | | | +-----------------------------------------------+

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 42/98 @kubem ~ http://jakub.marchwicki.pl Can you visualize this? A UI? Webservices are so hard to sell. business value? business value?

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 43/98 +-----------------------------------------------+ | | | +--------------------+--------------+ | | | | | | | | Boundary: SOAP | JSF | | | | | | | | +--------------------+--------------+ | | | | | | | EJB | | | | | | | +-----------------------------------+ | | | | | | +--------+ +-------+ +----------+ | | | | | | | | | | | JAX-WS | | JPA | | DROOLS | | | | | | | | | | | +--------+ +-------+ +----------+ | | | | | | JBoss 4.2.x | | | +-----------------------------------------------+

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 44/98 +-----------------------------------------------+ | | | +-----------------+-----------------+ | +---------------+ | | | | | | | | | Boundary: SOAP | REST endpoint | <--------------+ | Dedicated | | | | | | | mobile | | +-----------------+-----------------+ | | Single Page | | | | | | Application | | | EJB | | | | | | | | | | | +-----------------------------------+ | +---------------+ | | | | | +--------+ +-------+ +----------+ | | | | | | | | | | | JAX+WS | | JPA | | DROOLS | | | | | | | | | | | +--------+ +-------+ +----------+ | | | | | | JBoss 4.2.x | | | +-----------------------------------------------+

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 45/98 @kubem ~ http://jakub.marchwicki.pl Keep separate things separately NOTE TO SELF NOTE TO SELF

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 47/98 @kubem ~ http://jakub.marchwicki.pl microservices checklist microservices checklist Small business domain Independent; independently deployed Running in it’s own process Managing it’s data Loosely integrated using common communication protocols     

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 48/98 @kubem ~ http://jakub.marchwicki.pl retrospective retrospective

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 49/98 @kubem ~ http://jakub.marchwicki.pl — James Lewis “ We define libraries as components that are linked into a program and called using in-memory calls, while services are out-of-process components who communicate with remote procedure calls

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 50/98 @kubem ~ http://jakub.marchwicki.pl consumer driven contracts consumer driven contracts (… ) drives the development of the Provider from its Consumers point of view, which means consumer describes what and how it wants to receive the information (in a form of a contract) and then provider implements the service following the given contract.

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 51/98 @kubem ~ http://jakub.marchwicki.pl huge image repository EXIBIT C EXIBIT C -- 2007

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 52/98 +--------------------------------------+ | | | web / controllers | | | +-----------+--------------------------+ | | (1) ^ | | v | (5) | +-------------------------------------+ | | | application logic | | | +--+-------------------------+--------+ | | | (2) ^ | (4) | | | v | (3) v | +----------+--+ +------------------+ | | | | | MySQL | | filesystem | | | | | +-------------+ +------------------+

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 53/98 @kubem ~ http://jakub.marchwicki.pl can’t work with it The search function is unbelievably slow business value? business value?

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 54/98 @kubem ~ http://jakub.marchwicki.pl business as usual There is no such thing as legacy — what can’t be killed, becomes

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 55/98 Proxy +-----+ +------------------+ | | /* | | +----------------+--------------------------> | | | | | | The Old stuff | | | | | +--------+ | | | | | | | | | +------------------+ | | | | | | | | | Elastic Search | | | | data push | | | | | | | | | | | +------------------+ | | | | /search | | | | | +--------------------------> | | <------+ | | | Elastic Search | | | | index | | | | | +-----+ +------------------+

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 56/98 @kubem ~ http://jakub.marchwicki.pl microservices checklist microservices checklist Small business domain Independent; independently deployed Running in it’s own process Managing it’s data Loosely integrated using common communication protocols     

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 57/98 @kubem ~ http://jakub.marchwicki.pl retrospective retrospective

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 58/98 @kubem ~ http://jakub.marchwicki.pl Andrew Tanenbaum — Distributed Systems (2007) - Principles & Paradigms “(… ) as every parent of a small child knows, converting a large object into small fragments is considerably easier than the reverse process.

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 59/98 Write through update query +--------------------------+ +----------------------------------+ -------------------->| update denormalized view |-------->| update persistent (master) store | +--------------------------+ +----------------------------------+ Write behind update query +----------------------------------+ +---------------------------+ ---------------->| update persistent (master) store |----------->| update denormalized views | +----------------------------------+ +---------------------------+ Read through read query +--------------------------+ +---------------------------+ <---------------------| update denormalized view |<--------------| read persistent store | +--------------------------+ +---------------------------+

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 63/98 @kubem ~ http://jakub.marchwicki.pl don’t diagram - trace and visualize don’t diagram - trace and visualize

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 66/98 @kubem ~ http://jakub.marchwicki.pl event a single WAR cannot be deployed manually

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 67/98 @kubem ~ http://jakub.marchwicki.pl but we’ve already started! but we’ve already started! what do our services do when nobody watches?

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 69/98 @kubem ~ http://jakub.marchwicki.pl distributed computing distributed computing Leslie Lamport — Microsoft mailing list 1987 A distributed system is one in which the failure of a computer you didn’t even know existed can render your own computer unusable.

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 70/98 @kubem ~ http://jakub.marchwicki.pl distributed computing distributed computing

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 71/98 @kubem ~ http://jakub.marchwicki.pl fallacies of distributed computing fallacies of distributed computing — 1994 - 1998 (is) a set of assertions made by L Peter Deutsch and others at Sun Microsystems describing false assumptions that programmers new to distributed applications invariably make

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 73/98 @kubem ~ http://jakub.marchwicki.pl in other words in other words

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 76/98 @kubem ~ http://jakub.marchwicki.pl … before choosing a load balancer … before choosing a load balancer

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3/28/2019 Microservices, microservices everywhere ﬁle:///home/jakub/workspaces/slides/microservices-microservice_everything/slides.html?print-pdf#/ 77/98 @kubem ~ http://jakub.marchwicki.pl AWS Elastic Load Balancer nginx Ribbon + Eureka Ribbon + Consul Kubernetes

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