Designing for rapid release goto 2012

DESIGNING FOR RAPID RELEASE

Sam Newman

ThoughtWorks

@samnewmanGOTO: Aarhus 2012

We’re hiring...

Not Him

We’re hiring...

Why is rapid release important?

What criteria influence design?

Scaling

Durability

Scaling

Durability

Geographical

Scaling

Durability

Geographical

Compliance

Scaling

Durability

TechnologyGeographical

Compliance

Scaling

Durability

Performance

TechnologyGeographical

Compliance

What about making it easy to release?

Make it quick to make a change

Make it quick to deploy the change

Reduce the risk of releasing

MusikShopv1

MusikShopv2

v23 v9 v14v1

MusikShop

v23 v9 v14v1

MusikShop

v23 v9 v14v2

MusikShop

The Same Change...

...resulting in very different deployments

Each release is a rollback point

and a data gathering point

and a release process practiced often is more likely to work and to be efficient

Small, Incremental Releases FTW!

So how do we design our systems to allow

for small changes?

MusikShop

RekomendLib

MusikShop

RekomendLib

Invoice Creation

MusikShop

RekomendLib

Invoice Creation

MusikShop

RekomendLib

Invoice Creation

String Utils

MusikShop

RekomendLib

Invoice Creation

String Utils

Small units - easier to reason about

MusikShop

RekomendLib

Invoice Creation

String Utils

Small units - easier to reason about

Fast CI turnaround cycles

MusikShop v1

RekomendLib v134

MusikShop v1

RekomendLib v134

RekomendLib v200

MusikShop v1

RekomendLib v134

MusikShop v2

RekomendLib v200

MusikShop v1

RekomendLib v134

Change to a statically linked library = new deployment of the application

MusikShop v2

RekomendLib v200

MusikShop v1

Rekomender v124

MusikShop v1

Rekomender v124

MusikShop v1

Rekomender v124

Rekomender v200

MusikShop v1

Rekomender v124

Rekomender v200

MusikShop v1

Rekomender v124

MusikShop v1

Rekomender v124

Rekomender v200

MusikShop v1

Rekomender v124

Rekomender v200

Smoke Test

MusikShop v1

Rekomender v124

Rekomender v200

Smoke Test

Showcase

MusikShop v1

Rekomender v124

Rekomender v200

Smoke Test

Showcase

MusikShop v1

Rekomender v124

Rekomender v200

Smoke Test

Showcase

Blue/Green Deployments

What can stop blue/green deployments?

MusikShop v1

MusikShop v1 MusikShop v2

Avoid stateful services

Expensive Hardware!

Manual Circuit Breaker

MusikShop v1

Rekomender v124

www.MusikShop

Take That

Queens Of The Stone Age

Snoop Dogg

We Rekomend ‘The Brakes’!

MusikShop v1

Rekomender v124

www.MusikShop

Take That

Snoop Dogg

MusikShop v1

Rekomender v124

www.MusikShop

Take That

Snoop Dogg

We Rekomend ‘The Brakes’!We Can’t Rekomend

Right Now!

MusikShop v1

Rekomender v124

Rekomender v200

www.MusikShop

Take That

Snoop Dogg

Right Now!

MusikShop v1

Rekomender v124

Rekomender v200 Smoke Test

www.MusikShop

Take That

Snoop Dogg

Right Now!

MusikShop v1

Rekomender v124

www.MusikShop

Take That

Snoop Dogg

Right Now!

MusikShop v1

Rekomender v124

www.MusikShop

Take That

Snoop Dogg

Async Behaviour

MusikShop v1

Rekomender v124

www.MusikShop

Take That

Snoop Dogg

Async Behaviour

MusikShop v1www.MusikShop

Take That

Snoop Dogg

Async Behaviour

Take That

Snoop Dogg

Async Behaviour

Take That

Snoop Dogg

We Rekomend ‘The Brakes’!Waiting...

Async Behaviour

MusikShop v1

Rekomender v200

www.MusikShop

Take That

Snoop Dogg

We Rekomend ‘The Brakes’!Waiting...

Async Behaviour

MusikShop v1

Rekomender v200

www.MusikShop

Take That

Snoop Dogg

Things to watch for...

The Trifle

Musik Web

The Trifle

Musik Web

Persistence

The Trifle

Musik Web

Persistence

The Trifle

Musik Web

Persistence

The Trifle

Musik Web

Persistence

The Spider

CD Ordering System

The Spider

CD Ordering System

Whitemail System

The Spider

CD Ordering System

Whitemail System Data Wharehouse

The Spider

CD Ordering System

3rd Party Supplier

The Spider

CD Ordering System

3rd Party SupplierFinance System

The Spider

CD Ordering System

3rd Party SupplierFinance SystemDumb System 4

Dumb System 1 Dumb System 2

Dumb System 3

“A set of capabilities on an endpoint”

Add to cart

Checkout

Add to cart

Checkout

View Latest Releases

Add to cart

Checkout

Search

Add to cart

Checkout

Search

Listen To Previews

Add to cart

CheckoutView Latest

Releases

Search

Listen To Previews

Add to cart

CheckoutView Latest

Releases

Search

Listen To Previews

Shopping Cart Catalog

Music Library

Model Services Based On Your Business

Domain

MusikShop

Reko.v9

MusikShop

Reko.v9

Reko.v10

MusikShop

Internal Change

MusikShop

Reko.v9

Reko.v10

MusikShop

Internal Change Expansion

Reko.v10

MusikShop

Reko.v9

Reko.v10

MusikShop

Reko.v10

Internal Change Expansion Interface

Change

Reko.v10

MusikShop

Rekomender V9

MusikShop

Rekomender V9

MusikShop

Non-breaking expansion is to be preferred - but if you can’t...

Rekomender V9

MusikShop

Rekomender V9

MusikShop

iOS App

Consider maintaining multiple service endpoints

Rekomender V9

MusikShop

iOS App

Consider maintaining multiple service endpoints

Service B

Service A

Shared Lib v1

Service B

Service A

Shared Lib v1

Service B

Service A

Shared Lib v1

Service B

Service A

Shared Lib v1

Shared Lib v2

Service B

Service A

Shared Lib v1

Shared Lib v2

Beware of shared serialization protocols

Service B

Service A

Shared Lib v1

Shared Lib v2

WSDL-binding

Service B

Service A

Shared Lib v1

Shared Lib v2

WSDL-bindingJAXB

Service B

Service A

Shared Lib v1

Shared Lib v2

WSDL-bindingJAXB

Java Serialization

RFC 761

Postel’s Law: “Be conservative in what you do, be liberal in

what you expect“

MusikShop Rekomender

Consumer Driven Contracts

DATABASES!

DATA IS COOL

DATABASES ARE EVIL

RekomenderMusikShop

DB Schema

RekomenderMusikShop

DB Schema

RekomenderMusikShop

DB Schema

RekomenderMusikShop

Schema Schema

DB Instance

RekomenderMusikShop

Schema Schema

DB Instance

Each service owns its own data

RekomenderMusikShop

RDMS RDMS

RekomenderMusikShop

RDMS RDMSRiak

Rekomender

Release 1: Dual Write

Rekomender

Release 2: Read from Riak

Rekomender

Release 2: Read from Riak

Release 3: Retire RDMS

MusikShop

Rekomender

MusikShop

Rekomender AceSuggest

MusikShop

Dark Launching!

Decompose Your Systems

Model Your Domain

Get Interfaces Right

Seperate Deployment From Release

Questions?

Thanks!

@samnewman

We’re hiring!

Designing for rapid release goto 2012

Documents

Transcript of Designing for rapid release goto 2012

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