Microservices
How do I scale my codebase?
Microservices
A way of structuring your codebase to allow easy extensibility, higher maintainability and code collaboration.
The monolithic way
Separation of concerns
Divide your codebase in sections, such that each section is responsible for one and only thing.
Instead we do this
Magento
and this
https://goo.gl/1Nbxos (Bill Scott keynote)
MAINTAINABILITY
Think of the 80/20 Rule (The Pareto Law)
80% of your bugs are residing inside the 20% percent of your code.
NOW FIND THAT 20% INSIDE MILLIONS OF LOC.
Version control - conflicts
- How much time do you spend resolving conflicts?
- Do you dare to go back in history in search of a commit?
Scalability
- Monolithic Applications scale by adding more instances/servers/resources.
- But how much of those can you add?
- Are the resources used efficiently?
Extensibility
- Unless you have a test suite with 100% test coverage, you don't change things.
- Instead you add and add and keep adding.
- Monolithic apps are keep getting larger.
The monolithic way
One code base to rule em all.
- Maintainability
- Code collaboration
- Conflicts/Merges
- SoC
- Scalability/Extensiblity
Enter the new World Order
Microservices Architecture
- Easier to maintain
- Multiple teams work on multiple services
- Fewer conflicts
- Different stacks work for the same purpose
- SoC
- Easy to scale/extend, Just add a service
let's build an e-shop
Your app has/needs
-
Persistent storage
-
UI / Mobile App
-
Lots of Business Logic
Choose your intercommunication
-
Task Queue
-
REST APIs
Isolate the Database
-
Put a REST API in front of your Database
-
Let every other service that needs persistent storage to talk to the Data API
-
Reflect your Business Logic in your API endpoints
Create a Newsletter Service
-
Sends Emails, talks to Sendmail, Gunmail, etc
-
Keeps tracks of templates sent, analytics, etc
-
Utilizes the Data API
Create the UI Service
-
Will contain HTML, CSS, Client Side Business Logic, etc
-
Reads / Writes the Data API
Create the Mobile App
-
Will contain Native language stuff
-
Reads / Writes the Data API
What else do you need? Just create a service
Learn from the experts
- Netflix
Werner Vogels
If you hit the Amazon.com gateway page, the application calls more than 100 services to collect data and construct the page for you.
http://goo.gl/92xpfk
CTO/VP @ Amazon
If you start with Microservices, you are starting wrong.
Martin Fowler
Thank you
Microservices
By Kostas Bariotis
Microservices
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