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Sebastian Heuer
September 30, 2016
Technology
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Don't Fear the Walking Dead - How to get rid of a zombie
together with Sebastian Thoß at code.talks 2016
Sebastian Heuer
September 30, 2016
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Transcript
HOW TO GET RID OF A ZOMBIE DON’T
None
None
None
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
None
None
FURY Frontend Key-Value Storage getCategoryPage('hochzeit'); "<html><head>…</head><body>…</body></html>"
None
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
Webserver Key-Value Storage Search FURY Frontend FURY Backend Legacy RDBMS
Legacy System Session Storage FURY Requests 200 OK
Webserver Key-Value Storage Search FURY Frontend FURY Backend Legacy RDBMS
Legacy System Session Storage Requests to Legacy System 404 NOT FOUND
Webserver Key-Value Storage Search FURY Frontend FURY Backend Legacy RDBMS
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
Webserver (Router) Webserver FURY Frontend Server A K/V Storage Search
FURY Backend Webserver FURY Frontend Server B K/V Storage Search FURY Backend active = A
Webserver (Router) Webserver FURY Frontend Server A K/V Storage Search
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
RDBMS Read Slave Webserver FURY Frontend Server A K/V Storage
Search FURY Backend Webserver (Router) Build Server Deploy Code Collect & Export active = B
RDBMS Read Slave Webserver FURY Frontend Server A K/V Storage
Search FURY Backend Webserver (Router) Build Server Deploy Code Collect & Export Smoke Tests active = B
RDBMS Read Slave Webserver FURY Frontend Server A K/V Storage
Search FURY Backend Webserver (Router) Build Server Deploy Code Collect & Export Smoke Tests Switch to A active = A
RDBMS Read Slave Webserver FURY Frontend Server A K/V Storage
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
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
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![FURY Frontend Key-Value Storage ["SBU06HE","TEOD3HE","ANW04HD"] Search search("{'category':'hochzeit', 'filters':{}}"); getTiles(["SBU06HE","TEOD3HE","ANW04HD"]); ["<div](https://files.speakerdeck.com/presentations/d39ee1c951b6494593936781c6fe34f7/slide_16.jpg){kind=link}
![https://www.instagram.com/kartenmacherei/ Q&A https://www.facebook.com/kartenmacherei/ +49 40 468996861 [email protected] http://www.kartenmacherei.de/recruiting](https://files.speakerdeck.com/presentations/d39ee1c951b6494593936781c6fe34f7/slide_41.jpg){kind=link}