Mucon 2021 - Dark energy, dark matter: imperfect metaphors for desi...

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@crichardson
Dark energy, dark matter: imperfect
metaphors for designing
microservices
Chris Richardson
Microservice archi...

@crichardson
What you will learn
When defining a microservice
architecture
you must resolve
the competing forces of
attrac...

@crichardson
About Chris
http://adopt.microservices.io

@crichardson
Discounts
35% discount
ctwmucon21
$120 discount coupon
HIDKQIFC
http://adopt.microservices.io

@crichardson
Agenda
• Dark energy, dark matter and subdomains
• Dark energy and repulsion
• Dark matter and attraction
• R...

@crichardson
Microservice architecture =
architectural style
Small team
Loosely coupled
Independently deployable
<15 minut...

@crichardson
How to define a Microservice
Architecture…
Application
≪subdomain≫
Customer
≪aggregate≫
Customer
≪subdomain≫
...

@crichardson
Application
… how to define a
Microservice Architecture
Application
≪subdomain≫
Customer
≪aggregate≫
Customer...

@crichardson
≪subdomain≫
Customer
≪aggregate≫
Customer
≪subdomain≫
Order
≪aggregate≫
Order
≪subdomain≫
Customer
≪aggregate...

@crichardson
Dark energy, dark matter and
services
≪subdomain≫
Customer
≪aggregate≫
Customer
≪subdomain≫
Order
≪aggregate≫...

@crichardson
Attraction vs repulsion at
every level
Customer Service
Order Service
Order Service
«Subdomain»
Orders
«Subdo...

@crichardson
Service-specific attraction
≪subdomain≫
Customer
≪aggregate≫
Customer
≪subdomain≫
Order
≪aggregate≫
Order
Pro...

@crichardson
Agenda
• Dark energy, dark matter and subdomains
• Dark energy and repulsion
• Dark matter and attraction
• R...

Dark energy = anti-gravity
force
https://hubblesite.org/contents/media/images/2001/09/1034-Image.html?news=true
https://ge...

@crichardson
Repulsive forces subdomains
in different services
Service
Service
Module A
«Aggregate»
X
Module B
«Aggregate»...

@crichardson
Cognitive load of
subdomains
Simple
Complicate
Complex
Team sized services
5-9 person,
cross-functional
team
...

@crichardson
Grouping subdomains into
team sized services
Service
Simple
Simple
Simple
Service
Simple
Complicated
Service
...

@crichardson
<15 minute lead time
@mipsytipsy
https://speakerdeck.com/charity/cd?slide=17
Service
Service
Subdomain
Subdom...

@crichardson
Service
Tech. Stack
B
Service
Tech. Stack
A
Service
Tech. Stack
Requirement to use different
technology stack...

@crichardson
Service
Service
Service
Increasing scalability
Subdomain
A
Subdomain
A
Subdomain
B
Subdomain
B
versus
CPU MEM...

@crichardson
Separate by regulatory
requirements
• Quality Management System that complies with ISO 13485
• Software devel...

@crichardson
Service
Service
Service
Freedom to use different
development processes
SaMD
Subdomain
SaMD
Subdomain
Other
Su...

@crichardson
Infrastructure
Service
Separate by SLO/SLA
Payment
processing
subdomain
Merchant
management
subdomain
chargeC...

@crichardson
Infrastructure
Service
Separate loosely coupled
services = higher availability
Payment
processing
subdomain
M...

@crichardson
Agenda
• Dark energy, dark matter and subdomains
• Dark energy and repulsion
• Dark matter and attraction
• R...

@crichardson
About dark matter: orbital
velocity of stars
https://en.wikipedia.org/wiki/Galaxy_rotation_curve
Most mass
Vi...

About Dark matter
It’s invisible
Its composition is unknown
85% of the matter in the universe
Has a gravitational effect
R...

@crichardson
System operations generate attraction
forces between subdomains
Create
Order()
Order Subdomain
Customer Subdo...

@crichardson
Transactional coupling
Create
Order()
Order
Subdomain
Customer
Subdomain
reserveCredit()
createOrder()
Custom...

@crichardson
ACID transactions the span services
are problematic => use sagas
Order
Service
Customer
Service
POST /order
C...

@crichardson
Service
Runtime coupling
Create
Order()
Order
Subdomain
Customer
Subdomain
reserveCredit()
createOrder()
Cust...

@crichardson
Multi-service command: higher
latency and lower availability
Customer
Service
Order
Service
Order
Subdomain
C...

@crichardson
Service
Inter-service communication
Service
Order
Subdomain
Customer
Subdomain
Customer
Order
Nano-
seconds
“...

@crichardson
Order
Service
Data access
Service
Order
Subdomain
Customer
Subdomain
Simple
efficient
join
Database
select *
...

@crichardson
Design time coupling: risk of
lock step changes
Order
Subdomain
Customer
Subdomain
reserveCredit()
createOrde...

@crichardson
Key distributed data patterns
involve design-time coupling
API
Composer
Order
Service
Customer
Service
Saga
C...

@crichardson
Order
Service
Minimize design-time coupling
between services
Service
Order
Subdomain
Customer
Subdomain
Custo...

@crichardson
Agenda
• Dark energy, dark matter and subdomains
• Dark energy and repulsion
• Dark matter and attraction
• R...

@crichardson
Example: resolving conflicting
forces
Complicated
Order Mgmt
Simple
Customer Mgmt
Complicated
Fulfillment
fin...

@crichardson
Service
Non-team sized service
Complicated
Order Mgmt
Simple
Customer Mgmt
Complicated
Fulfillment
findOrder(...

@crichardson
Service
Define team sized services but
how?
Vs.
Service
Complicated
Order Mgmt
Simple
Customer Mgmt
Complicat...

@crichardson
Service
Service
The gravitational forces depend
on the (operation, subdomain)
Complicated
Order Mgmt
Simple
C...

@crichardson
Summary
≪subdomain≫
Customer
≪aggregate≫
Customer
≪subdomain≫
Order
≪aggregate≫
Order
Transaction coupling
Ru...

@crichardson
@crichardson chris@chrisrichardson.net
http://adopt.microservices.io
Questions?
ctwmucon21 HIDKQIFC

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