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Is Microservices gaining momentum? Looking at the interest in microservices in Australia at the moment, it is evident that this is a Service Oriented Architecture making waves. I shared our insights and experiences to over 500 interested attendees at completely sold out YOW! nights events across Sydney, Brisbane and Melbourne. These talks revealed the core lessons ThoughWorkers have learnt building a variety of systems with Microservices architecture globally. They aimed to help viewers identify Microservices and their counterparts; guide them on where to use Microservices; and deliver a series of practices for technologists to build, test, deploy and operate a Microservices architecture. The world of software architecture is excited and energised with the promises of a new Service Oriented Architecture, Microservices; rapid deployment, scalability, autonomy, and faster cycles of experimentation and innovation, and we are too!
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REAL-WORLD MICROSERVICES Lessons From The Frontline
AGENDA
2
Benefits & Complexities
Definition
Stories & Practices
WHAT IS A MICROSERVICES ARCHITECTURE? Post-continuous delivery SOA
WHAT IS A MICROSERVICES ARCHITECTURE?
Post-continuous delivery SOA Fine-grained domain capability
WHAT IS A MICROSERVICES ARCHITECTURE?
Post-continuous delivery SOA Fine-grained domain capability Independently releasable
WHAT IS A MICROSERVICES ARCHITECTURE?
Language agnostic integration
Post-continuous delivery SOA Fine-grained domain capability Independently releasable
WHAT MICROSERVICES ARCHITECTURE IS NOT
WHAT MICROSERVICES ARCHITECTURE IS NOT
Monolithic
WHAT MICROSERVICES ARCHITECTURE IS NOT
Monolithic
Layered and cross- functional
WHAT MICROSERVICES ARCHITECTURE IS NOT
Monolithic
Layered and cross- functional
Intelligently integrated
Intelligent Integration
WHAT MICROSERVICES ARCHITECTURE IS NOT
Monolithic
Intelligently integrated
Centrally integrated
Layered and cross- functional
INNOVATION COMPOSABILITY
VALUES
AUTONOMY with
RESPOSIBILITY
SPEED OF CHANGE
SCALE LOWER
CONGITIVE LOAD TECH DIVERSIFICATION
6
VALUES & PRINCIPLES Autonomy Speed of Change Scale Composability Tech Diversity
COMPLEXITIES Communication Execution Resilience Maintenance Operational
MICRO MACRO
RYAN’S STORY DOMAIN COMPLEXITY Supply Chain SAN FRANCISCO
7
SPLITTING FROM MONOLITH – BROWN FIELD
DOMAIN BOUNDED CONTEXT
SPLITTING FROM MONOLITH – BROWN FIELD
DOMAIN BOUNDED CONTEXT RATE OF CHANGE
SPLITTING FROM MONOLITH – BROWN FIELD
DOMAIN BOUNDED CONTEXT RATE OF CHANGE
TEAM STRUCTURE Conway’s Law
SPLITTING FROM MONOLITH – BROWN FIELD
DOMAIN BOUNDED CONTEXT RATE OF CHANGE
TEAM STRUCTURE Conway’s Law
SPLITTING FROM MONOLITH – BROWN FIELD
WHAT HURTS MOST
CAUTION: PARTITIONING BY EXISTING COUPLING
D3.js Structure 101
FxCop NDepend
10
GREEN FIELD DOMAIN MODELLING USE THE JOURNEYS
GREEN FIELD DOMAIN MODELLING INSPECT THE BOUNDED CONTEXTS
Neo4J
12
One service at a time
Single responsibility Loose coupling High cohesion SOLID principles
EVOLUTIONARY BACK TO BASIC PRINCIPLES
EVAN’S STORY SERVICE OWNERSHIP Online Real Estate MELBOURNE
13
LONG-LIVED TEAMS
15
15
LONG-LIVED TEAMS
FLUID TEAM MEMBERSHIP
15
LONG-LIVED TEAMS
FLUID TEAM MEMBERSHIP
COLLABORATIVE CODING
KENT’S STORY
EXECUTION COMPLEXITY PIPELINES Online Retail MELBOURNE
16
CONSUMER-DRIVEN CONTRACTS
Consumer Provider
Purchase Confirm. Email
Purchase Service
CONSUMER-DRIVEN CONTRACTS
Consumer Provider
Purchase Confirm. Email
Purchase Service
Purchase Service API Test
Purchase Service Mock
CONSUMER-DRIVEN CONTRACTS
Consumer Provider
Purchase Confirm. Email
Purchase Service
Purchase Service API Test
Purchase Service Mock
Production DECENTRALISED PIPELINE
Build Test Integration Test Acceptance Test
DECENTRALISED PIPELINE Build Test Consumer Test Acceptance Test Production
EVAN’S STORY OPERATIONAL COMPLEXITY - MONITORING Online Real Estate MELBOURNE
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20
Heartbeat for load balancer
21
Nagios
checks
22
Full diagnosis for human
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AGGREGATED MONITORING
Riemann Event processing
24
SYNTHETIC TRANSACTIONS
KENT’S STORY
OPERATIONAL COMPLEXITY TRADEOFFS
Online Retail MELBOURNE
25
MONITORING AGGREGATED LOGS
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ID: 123
ID: 123.467
ID: 123.892
RESILIENCE
STATUS • Up
RESILIENCE
STATUS • •
Up Down
RESILIENCE
STATUS • •
Up Down
STATUS • All up
RESILIENCE
STATUS • •
Up Down
STATUS • All up • All down
RESILIENCE
STATUS • •
Up Down
STATUS
• All up • All down • Mostly up
RESILIENCE
STATUS • •
Up Down
STATUS
• All up • All down • Mostly up Up apart from 1 •
RESILIENCE
STATUS • •
Up Down
STATUS
• All up • All down • Mostly up Up apart from 1 •
All of the important bits are up •
FAULT TOLERANCE PATTERNS
28
CIRCUIT BREAKER
Netflix/ Hystrix
[failure threshold reached]
CLOSED [call succeeds]
Reset
Trip breaker [call fails]
Trip Breaker HALF
OPEN
OPEN
on timeout Attempt Reset
JAMES’ STORY MAINTAINABILITY Telecommunication SYDNEY
29
SERVICES SELF-DISCOVERABILITY
SERVICES SELF-DISCOVERABILITY
SERVICES SELF-DISCOVERABILITY
SERVICES SELF-DISCOVERABILITY
SERVICESSELF-DISCOVERABILITY
SERVICES SELF-DISCOVERABILITY
SCOTT’S STORY A NEW DOMAIN VIEW Global Assignee Tax Services MELBOURNE
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History is the version of past events that people have decided to agree upon.
- Napoleon Bonaparte
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THE EVOLUTION OF MODELLING THE DOMAIN
33
Entity centric e.g. Credit
Entity centric e.g. Customer
THE EVOLUTION OF MODELLING THE DOMAIN
33
Entity centric e.g. Credit
Activity centric e.g. Purchase
Entity centric e.g. Customer
THE EVOLUTION OF MODELLING THE DOMAIN
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Entity centric e.g. Credit
Activity centric e.g. Purchase
Entity centric e.g. Customer
Aggregator centric e.g. Notification board
Search everywhere
Reports
THE EVOLUTION OF MODELLING THE DOMAIN
33
Entity centric e.g. Credit
Activity centric e.g. Purchase
Entity centric e.g. Customer
Aggregator centric e.g. Notification board
Search everywhere
Reports
DOMAIN EVENTS AS FIRST CLASS CITIZENS
DOMAIN EVENT Time {t}, CustomerRegistered, …
Time {t}, CreditDebited, … Time {t}, OrderPlaced, …
(1) Publisher- Subscriber (2) RESTful Event endpoints
F
Build future capabilities e.g. gamification
JR’S STORY CHOREOGRAPHY
Online Retail BRISBANE 35
SERVICE COMPOSITION
36
Leave composition to the one with most context Expose finer-grained operations Composition of Sync and Async is hard , try Reactive programming JavaScript Promises, RxJava Observables
GILES’ STORY FLEXIBILITY Sports Broadcasting LONDON
37
THAT POPULAR SPORT
38
KNOW YOUR PROBLEM & DOMAIN WELL
TAKE-AWAYS
TRADE-OFF COMPLEXITIES CAREFULLY
IT’S AN ORGANISATIONAL AND CULTURAL SHIFT
EVOLVE FROM MACRO TO MICRO
BUILD FOR CONTINUOUS DELIVERY FROM DAY 0
MAKE SURE YOU ARE TALL ENOUGH ☺
40
New!
41
THANK YOU! Zhamak Dehghani zdehghan@thoughtworks.com @zhamakd
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