Learn what Microservices are, what characterizes this architectural style and its most significant benefits and challenges

1. An Introduction to
Microservices
URI GOLDSTEIN, MARCH 2017

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Uri Goldstein
@urig
http://urig.io/
uri.goldstein@gmail.com

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Agenda
History and Definitions
Major Characteristics
Strengths and Challenges
Further Investigation

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A Bit of History
 Term coined in 2011
 Popular and gaining
popularity
 Evangelized by Netflix, AWS
 All the cool kids are doing it*
* Not really, no.

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Definition
There Is No Band
Official Definition

6. Definitions
Netflix:
“Fine grained SOA”
The web:
“SOA Done Right”
@urig:
“SOA in the Cloud”
James Lewis & Martin Fowler, 2014:
“An Architectural Style”
 Must-read article
 9 Common Characteristics

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Ex: Monolith vs Microservices

8. Microservices are services
 Single Responsibility
 Easily upgraded
 Easily replaced
 1 Service = 1 Process
 Exclusive Ownership of
Data
 Polyglot Technology

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Microservices are micro
 “Small enough to fit
in one’s head”
 Typically Tens to Tens of
Thousands LOC
 Owned by single
person / team

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Products not Projects
“You build it, You run it”
DevOps Skills and Mentality
Evolutionary Design

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Business drives architecture
Cross-functional teams
Organized around Business Capability
1 Service ≈ 1 Business Feature

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Smart endpoints and dumb pipes
Microservices are
the Anti-ESB

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Smart endpoints and dumb pipes
 More like WWW:
Logic resides in endpoints
Comm. layer is simple
Typically REST

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Distributed Means Distributed
Designed for Failure
Stateless
Asynchronous

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Benefits
Highly Scalable
Cost Effective*
Fast and Furious
Cloud Native

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Challenges

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No Compiler Safety Net
Testing
Versioning
Backward Compatibility

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Easy Deployment Isn’t Easy
DevOps
Automation
Continuous Delivery / Deployment

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Network Latency and Reliability
Design for Failure
Redundancy
Monitoring
Automation

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Take-Aways
 One size does not fit all
 Challenges are significant
 Do you have the skills to mitigate them?
 Are the benefits relevant for you?
 The Good News:
It’s not all or Nothing

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Further reading
 Microservices Resource Guide
https://www.martinfowler.com/microservices/
 Microservices Article: Lewis, James & Fowler, Martin
https://martinfowler.com/articles/microservices.html
 Adrian Cockroft: Migrating to Microservices (video)
https://www.infoq.com/presentations/migration-cloud-native
 Loads more…

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Thanks for listening – Question Time
uri.goldstein@gmail.com
GDG Rishon JetBrains give away!
http://tinyurl.com/GDGRL-March