Microservices The Basic Math

Why Microservices?

● 'Small' easier to manage

● Do more with less!● Reduce workload

– Developers– Architects– Business Agility

"Think Small" by Source. Licensed under Fair use via Wikipedia - http://en.wikipedia.org/wiki/File:Think_Small.jpg#/media/File:Think_Small.jpg

Reduce Mental Workload

● 2 Parts– Services– Interfaces

shared message formats through which services communicate

Basic Math: Segmentation

● Square = Business application● Segmenting => Microservices● Measure total size: Services + Interface

Service

Interface

1 Monolith or

Service

Interface

4 Services or

Service

Interface

16 Microservices

Service

Interface

What is the Problem?

Service : Interface = 1:1

Service

Interface

100%

100%

Service : Interface = 1:6

Service

Interface

150%

25%

Service : Interface = 1:40

Service

Interface

6.25%

250%

Single Service to Interface Ratio

Service to Interface Ratio

Square root of number of services

1 2 3 4 50

10

20

30

40

50

60

70

80

ratio_service_to_interface number_of_interfaces_per_developer

Financial & Human Factor

Days to study and understand

interface design

Invest $$ in learning curve

A B C D E F

G H I J K L

M N O P Q

R S T U V W

X Y Z

無事忘監督

株式会社一

部東北部寿

司地下鉄電

子学校側強

Microservice Interface

● Learning curve is expensive

● Like learning Chinese Characters

● 'Service-to-Interface' Ratio Increases

– Complex Interface environment

● Service contracts

● Shared message formats

● Counterproductive

Purpose of Microservices

● To combine and recombine services

● Create completely new services

● Make business more agile

The Goal - Ratio 1:1

Conclusion

● IF

Microservices cannot reduce the learning curve

and cost associated with complex interfaces

● THEN

they will not make a business more agile

2015 © 1060 Research Ltd

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