Transcription
Building EvolutionaryArchitectureswith Rebecca Parsons & Pat Kua@neal4dnealford.com
Rebecca ParsonsPat KuaPhotos by Martin rs/Neal Ford
What is SoftwareArchitecture?
requirementsEntire architectural Scope
elegalityscalabilityEntire architectural Scope
bilityilityreliabilityextensibilityfailure lityportabilityprecisionpredictabilityprocess s en.wikipedia.org/wiki/List of system quality attributes
bilityreliabilityextensibilityfailure tysimplicitystabilitystandards npredictabilityprocess bilityupgradabilityusabilityevolvability
Once I’ve built anarchitecture, how can Iprevent it from graduallydegrading over time?
How is long term planningpossible when thingschange unexpectedly?
Dynamic Equilibrium
Architecture is the decisionsthat you wish you could get right earlyin a project.— Ralph Johnsonthings that people perceiveas hard to change.
What if we buildarchitectures that expectchange?
Definition:An evolutionary architecture supportsincremental, guided change as a firstprinciple across multiple dimensions.
Perspectives on ArchitectureTechnical Architecture
Evolvability of Architectures
Big Ball of Mudclassescoupling connectionsdimensions :0
Layered Architectureopportunities:dimensions :41
Microkerneldimensions :1
RESTdimensions :1
Domain Perspectivedimensions :0
Microservicesevolutionary architecture dimensions :n
Definition:evolutionary architectureAn evolutionary architecture supportsincremental, guided change as a firstprinciple across multiple dimensions.
Composability
Composability
Composability
Definition:evolutionary architectureAn evolutionary architecture supportsincremental, guided change as a firstprinciple across multiple dimensions.
Incremental ChangeComponents are deployed.Features are released.Applications consist of routing.production
Incremental Changeproduction
Definition:evolutionary architectureAn evolutionary architecture supportsincremental, guided change as a firstprinciple across multiple dimensions.
Perspectives on ArchitectureData Architecture
Perspectives on ArchitectureSecurity Architecture
Perspectives on ArchitectureDomain Architecture
MicroservicesDomain Architecture
Fitness Functions a particular type of objective function that isused to summarize how close a givendesign solution is to achieving the set aims.
Architecture Fitness Functions metricstests
Definition:evolutionary architectureAn evolutionary architecture supportsincremental, guided change as a firstprinciple across multiple dimensions.
Agendadefinitionincremental changefitness functionsappropriate coupling
Fitness Functiona particular type of objectivefunction that is used tosummarize how close a givendesign solution is to achievingthe set aims.
Architecture Fitness Functionsmetricstests
Architecture Fitness Functionsmetricstests
Fitness Functionatomicholisticbatchcontinuous
Fitness Functionatomicholisticbatchcontinuous
Fitness Functionbatchatomicholisticcontinuous
Cyclic Dependency tion
Coupling Fitness Functionapplication
Fitness Functionbatchatomicholisticcontinuous
Fitness Functionatomicholisticbatchcontinuous
Fitness Functionatomicbatchholisticcontinuous
batchholisticHolistic fitness functions must run in a specific (shared) context.
Consumer Driven ontracts.html
Fitness Functionatomicbatchholisticcontinuous
Fitness Functionatomicholisticbatchcontinuous
Fitness Functionatomiccontinuousholisticbatch
atomicmonitoringcontinuouslogging
Fitness Functionatomiccontinuousholisticbatch
Fitness Functionatomicholisticbatchcontinuous
Fitness Functionatomiccontinuousbatchholistic
holisticresilience-ility?
Fitness Functionatomiccontinuousbatchholistic
Fitness Functionatomicholisticbatchcontinuous
System-wide Fitness Function
Fitness Function Fit
Guided Evolution
Agendadefinitionincremental changefitness functionsappropriate coupling
Prerequisites
Deployment Pipeline
Deployment Pipeline
Incremental Changev cwherec cycle timev maximum speed of new generationsEngine of evolutionary architecture
Agendadefinitionincremental changefitness functionsappropriate coupling
Code Reuse (Over Time)checkoutSOACustomershipping
Code Reuse (Over Time)checkoutmicroservicesshipping
The more reusable code is,the less usable it is.
Decentralized Data Management
Decentralized Data ManagementTransactions aretemporal coupling.
Decentralized Data ManagementLimittransactionalcontexts.
Evolutionary Database Designhttp://databaserefactoring.com/
Evolving Columns
Transition
Expand/Contract Patternapp v205compatible with dbv13 and v14DBversion13app v230compatible with dbv14app v234compatible with dbv14app v241compatible with dbv14 and 15DBversion14app v205deployedmigratedb to v14app v248compatible with dbv15DBversion15app v230deployedapp v234deployedTimeapp v234deployedmigratedb to v15app v248deployed
Decentralized Governance
Decentralized Governance
Decentralized Governance
“Goldilocks” GovernanceChoose technology stacksappropriate to problem scale.
Shift to Domain-centric Architectures
Shift to Domain-centric Architectures
Shift to Domain-centric Architectures
Incidentally Coupled Teamsuser interfaceserver-sideDBA
Conway’s Laworganizations which designsystems . are constrained toproduce designs which are copiesof the communication structuresof these organizationsMelvin Conway, 1968en.wikipedia.org/wiki/Conway%27s law
Incidentally Coupled Teamsuser interfaceserver-sideDBA
Autonomous TeamsOrdersShippingInverse Conway ManeuverCatalog
Low Efferent Coupling between Teamsn(n-1)2
Architectural Quantum
Architectural Quantum
Architectural Quantum
Architectural Quantum
UtilizingEvolutionary Architecture
1. Choose Dimensions
elegalityscalabilityEntire architectural Scope
auditabilitydatasecurityfitness ilityEntire architectural Scope
auditabilitydatasecurityfitness ilityEntire architectural Scope
UtilizingEvolutionary Architecture
2. Identify Fitness Functionsatomic/automated / manualholistic
UtilizingEvolutionary Architecture
3. Apply Incremental Change
UtilizingEvolutionary Architecture
UtilizingEvolutionary Architecture
Agendadefinitionincremental changefitness functionsappropriate coupling
Why should a companydecide to build anevolutionary architecture?
Predictable versus EvolvableScaleWhyshouldacompanyCycle Time as a Business Metricdecide to build anIsolating “—ilities” at the Quantum Levelevolutionary architecture?Longer Lasting Useful SystemsAdvanced Business Capabilities
Why should a companydecide to build anevolutionary architecture?
Why would a company choose notto build an evolutionaryarchitecture?
Can’t Evolve a Ball of MudWhywouldacompanychoosenotOther Architectural Characteristicsto buildDominatean evolutionaryarchitecture?Sacrificial ArchitecturePlanning on Closing the Business Soon
Predictable versus EvolvableScaleWhyshouldacompanyCycle Time as a Business Metricdecide to build anIsolating “—ilities” at the Quantum Levelevolutionary architecture?Longer Lasting Useful SystemsAdvanced Business Capabilities
Hypothesis and DataDriven Development
MoveFast&FixThings
https://github.com/github/scientist
︎ It decides whether or not to run the try block, ︎ Rrun,andomizes the order in which use and try blocks are ︎ Measures the durations of all behaviors, ︎ Compares the result of try to the result of use,wallows (but records) any exceptions raised in the try ︎ Sblock ︎ Publishes all this information.
Bugs Found; Resolutionfaster conflict return because shell script exited ︎ immediately;replicated in libraryndex write was causing O(n) problem; inlined into ︎ imemoryhe ancestor had a file with a given filemode, whilst one ︎ tsideof the merge had removed the file and the otherside had changed the filemode; bug in git!it incorrectly successfully merged files w/ 768 conflicts; ︎ Gfixedgit shell scriptew library was skipping an entire step; bug found & ︎ nfixed
Definition:evolutionary architectureAn evolutionary architecture supportsincremental, guided change as a firstprinciple across multiple dimensions.
http://evolutionaryarchitecture.com
mlnealford.com/books
Agendadefinitionincremental changefitness functionsappropriate coupling
Building Evolutionary Architectures @neal4d nealford.com with Rebecca Parsons & Pat Kua. Rebecca Parsons Pat Kua Neal Ford Photos by Martin Fowler: . Microservices evolutionary architecture dimensions : n. An evolutionary architecture supports incremental, guided change as a first
