Don't Fear the Walking Dead - How to get rid of a zombie

HOW TO GET RID OF A ZOMBIE DON’T

How we started • built on top of a standard
e-commerce platform • a lot of custom code to support a wide combination of product options Feature X Feature Y Feature Z Core Code Customization

The challenges of a growing business • serious performance issues
• own developers don’t feel comfortable with the code • adding individual features is too complex • upgrading is hard

Finding a way out

You don’t have to replace everything at once!

What part of the software causes the highest amount of
pain? • category pages • product detail pages

Planning

Current Setup Legacy System Session Storage RDBMS Webserver

Idea Legacy System Session Storage RDBMS Webserver New Software

FURY Frontend Key-Value Storage getCategoryPage('hochzeit'); "<html><head>…</head><body>…</body></html>"

FURY Frontend Key-Value Storage ["SBU06HE","TEOD3HE","ANW04HD"] Search search("{'category':'hochzeit', 'filters':{}}"); getTiles(["SBU06HE","TEOD3HE","ANW04HD"]); ["<div
class="category-item">…</div>", …]

Webserver Key-Value Storage Search FURY Frontend FURY Backend FURY Components

Webserver Key-Value Storage Search FURY Frontend FURY Backend Legacy RDBMS
Legacy System Session Storage Collect & Export

Legacy System Session Storage FURY Requests 200 OK

Legacy System Session Storage Requests to Legacy System 404 NOT FOUND

Legacy System Session Storage Requests to Legacy System 404 NOT FOUND 200 OK

Learnings • we have full responsibility now • no framework
needed • no relational database needed

Goods and Bads • fully object-oriented • easy refactoring thanks
to 100% code coverage • not enough automated acceptance tests • dependencies to legacy software (database changes, API calls)

A/B Deployment

Webserver (Router) Webserver FURY Frontend Server A K/V Storage Search
FURY Backend Webserver FURY Frontend Server B K/V Storage Search FURY Backend

FURY Backend Webserver FURY Frontend Server B K/V Storage Search FURY Backend active = A

FURY Backend Webserver FURY Frontend Server B K/V Storage Search FURY Backend active = B

RDBMS Read Slave Webserver FURY Frontend Server A K/V Storage
Search FURY Backend Webserver (Router) Build Server Deploy Code active = B

Search FURY Backend Webserver (Router) Build Server Deploy Code Collect & Export active = B

Search FURY Backend Webserver (Router) Build Server Deploy Code Collect & Export Smoke Tests active = B

Search FURY Backend Webserver (Router) Build Server Deploy Code Collect & Export Smoke Tests Switch to A active = A

Search FURY Backend active = B Webserver (Router) Build Server Deploy Code Collect & Export

What's next?

Client /product

Client /checkout/cart

Client /checkout/cart Cart Service

11. Oktober 2016

Next steps • open-source our CQRS RESTful Framework • replace
the next parts of the legacy system with new, self-contained components / services

"one hundred fifty-seven quinvigintillion, seven hundred eighty-six quattuorvigintillion, six hundred
fifty-seven trevigintillion, seven hundred forty-seven duovigintillion, three hundred forty unvigintillion, one hundred eighty-six vigintillion, (…) nine hundred forty-five quintillion, eight hundred twenty-eight quadrillion, two hundred seventy trillion, eighty billion, …"

https://www.instagram.com/kartenmacherei/ Q&A https://www.facebook.com/kartenmacherei/ +49 40 468996861 [email protected] http://www.kartenmacherei.de/recruiting

Don't Fear the Walking Dead - How to get rid of...

Don't Fear the Walking Dead - How to get rid of a zombie

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