Strangling the Monolith With a Data-Driven Approach: A Case Study

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A Data Driven Approach
Dec 6, 2017
Simon Duffy, Staff Product Manager | Pivotal Labs
David Julia, Director | Pivotal Labs

Additional business features
Cost Estimator for medical procedures
Financial Penalties for inaccurate estimations

3rd Party Web UI
Monolith
Source
System 1
Source
System 2
Source
System 3
… Source
System N

Main Member-Facing
Web UI
Account
Customization
Member Store
Secure Messages
...etc.
Member Liability
Estimator SOAP
Servi...

Main Member-Facing
Web UI
Account
Customization
Member Store
Secure Messages
...etc.
Member Liability
Estimator SOAP
Servi...

The expert leads the way

Complex flows create anxiety

External QA test team with competing priorities
Generating mocks and test cases is time consuming
Testing is not Productio...

♥
Strangler Fig Hollow Inside of Strangler Fig

+
=
☺

3rd Party Web UI
Monolith
Source
System 1
Source
System 2
Source
System 3
Project X
3rd Party Web UI
1 week

3rd Party Web UI
Monolith
Source
System 1
Source
System 2
Source
System 3
Project X
3rd Party Web UI
Monolith
Source Syste...

Web App UI
Monolith
Source System
1
Source System
2
Source System
3
Project X
Calculation Module
3 weeks

✖ ✖

Web App UI
Monolith
Source System
1
Source System
2
Source System
3
Project X
Calculation Module
4 weeks

Web App UI
Monolith
Project X
Calculation Module
Source System
1
Source System
2
Source System
3
5 weeks

Project X
3rd Party Web UI
Source System
1
Source System
2
Source System
3
Project X
Calculation Module
13 weeks

V100
Project X
Calculation
Module
Production
Baseline
Extractor
Extract
v100
15 weeks

Build & Test
Deploy to
Staging
Baseline
Variance Test
Deploy to Prod
Take New
Baseline

Build & Test
Deploy to
Staging
Baseline
Variance
Test
Deploy to
Prod
Take New
Baseline
V101
Project X
Calculation
Module
v...

Build integrity in -> Continuous delivery
You can’t always analyze a problem before acting.... Accept it and lean in!
Valu...

Consumer
Legacy System
Proxy
New System

Consumer request
Execute legacy app Execute new app
Route
old or
new

You want to decompose a system, and you know the logic inside it.
OR
You can redefine the business rules in the new system...

Consumer request
Execute new app
Log request
Orchestrate calls to
old and new
Log responses
Execute legacy app
Analyse res...

You want to decompose a system, and don’t know the logic inside it.
AND
The output of your new system ought to match the m...

Strangling the Monolith With a Data-Driven Approach: A Case Study

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