The end of the monolith?

Elastically scalable architectures with

microservices.

Monolithic architecture

Feel the pain

intro

Netflix, PayPal, Twitter, Amazon… What do they have in common?

Are monolithic architectures dead?

Distributed architecture with smaller services

about me

Javier Arias, senior software engineer at Telefonica.

Working during last year with a microservices in EyeOS, helping to create an VDI (Virtual Desktop Infrastructure) platform.

@javier_ariloshttp://about.me/javier.arilos

Back to the question

Objective: To discuss about microservices

concepts & misconceptions

Are monolithic architectures dead?

A brief history of architectures

Mainframes, Client/server (2 and then 3 tiers)SOAMicroservices

Mainframe, Client/Server, SOA,

Microservices…

They tried to solve architectural problems

And the history repeats

but… there is no silver bullet

The catalysts

Agile everything

The catalysts (I)

Cloud and containers

The catalysts (II)

Continuous Integration and

Delivery

Automate QA and Deployment,

Feedback

The catalysts (III)

Microservices

And we, software

engineers are fashion

victims.

Microservices are

trendy, since 2014.

Microservices definition

Loosely coupledservice oriented architecture

with bounded contexts.(Adrian Cockcroft)

Loosely coupled

released & upgraded independently

no shared database

avoid complex middlewares (SOA)

service oriented architecture

run as standalone processes

talk via APIs, semantic versioning

with bounded contexts

size & responsibilities matter a

lot.

organized around business

capabilities

Domain Driven Design & bounded

contxts

Microservice characteristics

microservice anatomy

persistence & languagespoiled by choice?

be careful when adding technologies

microservices talking to microservices

API + lightweight communications

HTTP vs lightweight message bus

are your microservices good citizens?

stateless: key for scalabilityfailure ready: death or dependency failureidempotent: repeated reqs yield same resultoperations ready: logging, correlation...

we know how to develop microservices

microservices are dynamic

services start / stop all the time

where are my services?

service discovery

DNS vs Database Query

failure detection

scalingmicroservices: stateless, discoverable

manual scale is boring let’s go dynamic

how we decide on scaling?Information, from:

serverschannel

still awake?

please wake up your buddies

around!

just 10 slides to go… :-)

monolith vs microservices: the essence

deploy many collaborating processes

vsdeploy single platform of

components

simpler to deploymore difficult to scale, specially deployment

monolith vs microservices: deploy

more complexityscales better (software, teams and deployment)

microservices: many processes 2 deploy

monolith: one single ‘thing’ 2 deploy

prone to coupling: code, databasein-process callsmuch easier to refactor and test

monolith vs microservices: distributed

computing

decoupled by deploymentdistributed computing is hard: failure-ready, many moving parts, testing

microservices: distributed computing

monolith: no distributed computing

consistency, simpleroperations are simpler

monolith vs microservices: platform

best tool for the job, more freedom, more complexityoperations are more complex

microservices: many technoligies

monolith: constrained technologies

size

cost

microservices

monolith

New project: monolith or microservices?

WHY DON’T WE FOLLOW THEHAPPY PATH?

wrong monolith

what is really wrong with monoliths?

bad designed monoliths

well designed monoliths

lower coupling, design for change

DDD with bounded

contextsAPI:

Facade Design PatternNo

database

sharing

size

cost

microservices

monolith

can we now follow the happy path?

remember...

whatever your problems are...

there is no silver bullet

references

talk abstract

In the last years the microservices architecture style has been gaining traction with some companies such as Netflix, Yelp, Gilt, PayPal. Many of that companies abandoned their previous monolithic architecture and moved to a microservices approach.

Does that mean that monolithic architectures are a thing of the past?

In this talk we will review some key microservices concepts (and misconceptions), search for the essence of microservices architectures and discuss about different approaches to implement them from the industry, including how we implemented it in EyeOS.