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@janogonzalez MICROSERVICES IN PRACTICE

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LAST YEAR…

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Leandro “Inkel” López, 2013 “El ordenador, ordena.
 La computadora, computa” ˝

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12hrs AUDIO/min

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HUNDREDS OF MILLIONS users/month

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MANY PLATFORMS

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$ rails soundcloud

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The Mothership

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Pearl Jam - Do the Evolution “It’s evolution, baby!” ˝

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soundcloud.com iOS/Android 3rd party Public API Domain logic The Mothership

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WELCOME TO THE MONOLITH Population: you

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CONWAY’S LAW

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Marvin Conway, 1968 “Organizations produce systems whose design is a copy of the structure of the organization”


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BREAKING THE
 MONOLITH ˝

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MICROSERVICES ARCHITECTURE

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JUST SOA FOR HIPSTERS?

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CROSS FUNCTIONAL 
 TEAMS ˝

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BOUNDED
 CONTEXTS ˝

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Track User Favoriting

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DOMAIN MODEL 
 FITS IN YOUR HEAD ˝

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Track Likes Count Favoriting

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YOU CAN USE 
 THE RIGHT TOOLS ˝

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FASTERS 
 TESTS ˝

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ENABLES 
 REPLACEABILITY ˝

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CONTINUOUS 
 DEPLOYMENT ˝

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SOA WITHOUT VENDOR LOCK-IN?

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SMART COMPONENTS, 
 DUMB PIPES ˝

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HC SVNT DRACONES ˝

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YOU CAN USE 
 TOO MANY TOOLS ˝

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DUPLICATED 
 EFFORTS ˝

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AVAILABILITY VS 
 CONSISTENCY ˝

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CASCADING 
 FAILURES ˝

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TOO MANY 
 NETWORK CALLS ˝

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YOU HAVE 
 NETWORK CALLS ˝

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L. Peter Deutsch - Ten Fallacies of Distributed Computing “The network is reliable”


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WHO CALLS WHO AGAIN?

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OUR MIGRATION TO MICROSERVICES

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SAY NO TO THE 
 BIG-BANG ˝

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EXTRACT WHEN 
 MODIFYING ˝

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Client Apps Public API Domain logic The Mothership Microservice Internal API (bounded context)

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DE-ACTIVE 
 RECORD ˝

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def index likes = user_likes_service.public_track_likes( @user, pagination_params) ! respond collection_for(likes) end

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USE 
 FEATURE FLAGS ˝

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if $feature.active?(:use_likes_service, current_user) … else … end

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CREATE 
 YOUR SERVICE ˝

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MONITOR 
 YOUR SERVICE ˝

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PREVENT 
 CASCADING FAILURES ˝

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CIRCUIT BREAKERS ˝

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X X X

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X X X

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X X

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USE LIFECYCLE 
 EVENTS ˝

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Public API Domain logic The Mothership Microservice Internal API Events Broker

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EVENTUAL 
 CONSISTENCY ˝

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Microservice Microservice Client b1:(p,q,r), b2:(/) (a1;b1),(a1;b2)

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DEFINE AUTHORITATIVE 
 SOURCES ˝

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DEFINE SYSTEM 
 ROLES ˝

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Microservice Microservice Client b1:(p,q,r), b2:(/) (a1;b1),(a1;b2)

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Listing system Entity System Client b1:(p,q,r), b2:(/) (a1;b1),(a1;b2)

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REDUCE 
 “CHATTINESS” ˝

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ONE SIZE 
 DOESN’T FIT ALL ˝

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CLIENT SPECIFIC 
 APIs ˝

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BFF ˝

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Listing system Entity System Entity System Client specific API

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Listing system Entity System Entity System Client specific API (a1;b1),(a1;b2)

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Listing system Entity System Entity System Client specific API a1:(x,y,z) b1:(p,q,r), b2:(/)

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Listing system Entity System Entity System Client specific API (a1.x, a1.y, b1.p)

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EXTRACTING 
 LIBRARIES ˝

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COMING SOON…

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DISTRIBUTED 
 TRACING ˝

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MORE TOLERANT 
 READERS ˝

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BINARY 
 PROTOCOLS? ˝

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CONCLUSIONS

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SMALL FOCUSED
 TEAMS ˝

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DELIVERING
 FAST ˝

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BEWARE OF
 LOSING THE BIG PICTURE ˝

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BEWARE OF
 TOO MANY STACKS ˝

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BEWARE OF
 DUPLICATE EFFORTS ˝

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AVOID
 BIG-BANG MIGRATIONS ˝

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EXPECT
 DISTRIBUTED FAILURE ˝

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MONITOR
 ALL THE SERVICES ˝

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MICROSERVICES WORK
 FOR US, BUT…

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NO SILVER BULLET ˝

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THANK YOU [email protected] http://soundcloud.com/jobs

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(WE ARE HIRING) [email protected] http://soundcloud.com/jobs

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•https://www.flickr.com/photos/rubyconfar/11231906253/in/set-72157638113568114
 •"Gilbert Hill, Andheri" by Madhav Pai - originally posted to Flickr as Gilbert Hill, Andheri. Licensed under Creative Commons Attribution 2.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/ File:Gilbert_Hill,_Andheri.jpg#mediaviewer/File:Gilbert_Hill,_Andheri.jpg