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DESIGNING FOR RAPID RELEASE
Sam Newman ThoughtWorks
Tuesday, 2 October 12@samnewman GOTO: Aarhus 2012
We’re hiring...
Not Him
Tuesday, 2 October 12DESIGNING FOR RAPID RELEASE Sam Newman ThoughtWorks Tuesday, 2 - - PowerPoint PPT Presentation
DESIGNING FOR RAPID RELEASE Sam Newman ThoughtWorks Tuesday, 2 - - PowerPoint PPT Presentation
DESIGNING FOR RAPID RELEASE Sam Newman ThoughtWorks Tuesday, 2 October 12 Not Him Were hiring... @samnewman GOTO: Aarhus 2012 Tuesday, 2 October 12 @samnewman GOTO: Aarhus 2012 Tuesday, 2 October 12 Tuesday, 2 October 12 Were
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We’re hiring...
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@samnewman GOTO: Aarhus 2012
Why is rapid release important?
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@samnewman GOTO: Aarhus 2012
What criteria influence design?
Scaling Durability Performance Technology Geographical Compliance
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@samnewman GOTO: Aarhus 2012
What about making it easy to release?
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@samnewman GOTO: Aarhus 2012
Make it quick to make a change Make it quick to deploy the change Reduce the risk of releasing
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MusikShop v1 MusikShop v2
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v23 v9 v14 v2 v1 MusikShop
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@samnewman GOTO: Aarhus 2012 The Same Change... ...resulting in very different deployments
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...
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
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Small, Incremental Releases FTW!
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So how do we design
- ur systems to allow
for small changes?
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MusikShop Rekomend Lib Invoice Creation String Utils ... Small units - easier to reason about Fast CI turnaround cycles
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@samnewman GOTO: Aarhus 2012
MusikShop v1 Rekomend Lib v134
Change to a statically linked library = new deployment of the application
MusikShop v2 Rekomend Lib v200
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@samnewman GOTO: Aarhus 2012
MusikShop v1
Rekomender v124 Rekomender v200
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@samnewman GOTO: Aarhus 2012
MusikShop v1
Rekomender v124 Rekomender v200
Smoke Test Showcase
Blue/Green Deployments
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What can stop blue/ green deployments?
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MusikShop v1 MusikShop v2
Avoid stateful services User
State
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@samnewman GOTO: Aarhus 2012
Expensive Hardware!
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@samnewman GOTO: Aarhus 2012
Manual Circuit Breaker
MusikShop v1
Rekomender v124 Rekomender v200
Smoke Test
www.MusikShop
Take That Queens Of The Stone Age Snoop Dogg
We Rekomend ‘The Brakes’! We Can’t Rekomend Right Now!
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Async Behaviour
MusikShop v1
Rekomender v124 Rekomender v200 www.MusikShop
Take That Queens Of The Stone Age Snoop Dogg
We Rekomend ‘The Brakes’! Waiting...
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Things to watch for...
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The Trifle
Musik Web Persistence
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The Spider
CD Ordering System Whitemail System Data Wharehouse 3rd Party Supplier Finance System Dumb System 4 Dumb System 1 Dumb System 2 Dumb System 3
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“A set of capabilities on an endpoint”
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Add to cart Checkout View Latest Releases Search Listen To Previews
Shopping Cart Catalog Music Library
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Model Services Based On Your Business Domain
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@samnewman GOTO: Aarhus 2012 Musik Shop v1
Reko. v9 Reko. v10
Musik Shop v1 Musik Shop v2
Reko. v10 Internal Change Expansion Interface Change Reko. v10
Musik Shop v1
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Musik Shop
v2
iOS App Consider maintaining multiple service endpoints Non-breaking expansion is to be preferred - but if you can’t...
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Service B Service A Shared Lib v1 Shared Lib v1 Shared Lib v2
Beware of shared serialization protocols WSDL-binding JAXB Java Serialization
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RFC 761
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Postel’s Law:
“Be conservative in what you do, be liberal in what you expect“
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MusikShop
Rekomender
Consumer Driven Contracts
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DATABASES!
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DATA IS COOL
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DATABASES ARE EVIL
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Rekomender MusikShop
DB Schema
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Rekomender MusikShop
Schema Schema
DB Instance Each service owns its own data
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Rekomender MusikShop
RDMS RDMS Riak
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Riak
Rekomender
RDBMS
Release 1: Dual Write Release 2: Read from Riak Release 3: Retire RDMS
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MusikShop
Rekomender AceSuggest
Dark Launching!
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Decompose Your Systems Model Your Domain Get Interfaces Right Seperate Deployment From Release
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Questions?
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Thanks!
@samnewman