Microservices FTW? - Speaker Deck

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Microservices FTW? Matthew Rudy Jacobs Wednesday March 11th 2015

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@matthewrudy

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THE NEW HOTNESS!

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TO THE MOON!

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MARTIN FOWLER March 2014

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AND ME? March 2014 March 2015

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GET THE BOOK!

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OFF TOPIC

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COINCIDENCE?

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THE CONCEPT

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“THE SINGLE RESPONSIBILITY PRINCIPLE, APPLIED TO SOA”

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TAKE YOUR MONOLITH

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AND BREAK IT APART

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IN PRACTICE

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Todos Users Todos Controller Users Controller Mailer SQL Todos Users

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Todos Controller Todos Users Controller Users Mailer Riak Todos SQL Users Gateway

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Gateway Todos Users Mailer Auth LOTS OF LITTLE PIECES

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Gateway Todos Users V2 Mailer Auth EASY TO UPDATE

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Gateway Todos Users V2 Mailer Auth EASY TO SCALE UP

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Gateway Todos Mailer Auth OR SCALE DOWN Users V2

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Gateway Todos Mailer Auth ADD NEW FEATURES Search Users V2

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Golang Clojure Ruby Perl Scala USING THE RIGHT TOOLS Java

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Gateway Todos Users Auth AND THE RIGHT DATASTORES Riak SQL Mailer Search ElasticSearch

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COMMUNICATION

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Users SYNCHRONOUS POST /users {id: 123, name: “Gary”}

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Mailer ASYNCHRONOUS POST /todos/123/notify/complete 200 OK

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ORCHESTRATION VS CHOREOGRAPHY

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Todos Mailer ORCHESTRATION Email Call API Todo Completed

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Todos Mailer CHOREOGRAPHY RabbitMQ Emits Event Subscribes to Events Email Todo Completed

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HTTP+JSON GET /users/123 { id: 123, name: “Suzy”, email: “[email protected]” }

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THRIFT struct User { 1: i32 id, 2: string name, 3: string email } service Users { User show(1:i32 id) }

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PROTOCOL BUFFERS message User { required int32 id = 1; required string name = 2; optional string email = 3; } service UserService { rpc Show (ShowRequest) returns (ShowResponse); }

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HTTP+JSON?

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PROBLEMS

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SERVICE TESTING IS EASY INTEGRATION TESTING IS HARD

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POLYGLOT PROGRAMMING HIGHER BARRIER FOR DEVS

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ITS EASY TO SCALE MONITORING BECOMES HARD

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HTTP CACHING FOR FREE LATENCY AND NETWORK ERRORS

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SERVICES ARE LOOSELY COUPLED CHANGING ANY API IS DIFFICULT

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EACH PIECE IS SIMPLE PUTTING IT TOGETHER IS COMPLEX

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THE SAME COMPLEXITY JUST IN DIFFERENT PLACES

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The Death Star http://www.slideshare.net/adriancockcroft/dockercon- state-of-the-art-in-microservices

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IS IT NECESSARY?

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https://speakerdeck.com/a_matsuda/the-recipe-for-the- worlds-largest-rails-monolith

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A MASSIVE MONOLITH

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50 DEVELOPERS 300 SERVERS 15,000 REQUESTS / SECOND 10 DEPLOYS / DAY

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BUT…

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CUSTOM DB SHARDING CUSTOM TESTING SCHEME CUSTOM MIGRATION CUSTOM DEPLOYMENT

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MAYBE THEY’D BE BETTER OFF MICRO-SERVICED UP!

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THE PRAGMATIC APPROACH

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Create Services When You Need Them Todos Users Todos Controller Users Controller Mailer SQL Todos Users

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Todos Users Todos Controller Users Controller Mailer SQL Todos Users Search ElasticSearch

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Todos Users Todos Controller Users Controller Mailer SQL Todos Users Auth Search ElasticSearch

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Todos Users Todos Controller Users Controller SQL Todos Users Auth Search ElasticSearch Mailer

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Todos Users Todos Controller Users Controller Auth Search ElasticSearch Mailer Riak Todos SQL Users