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Slicing up a monolithic application Why and how?
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Olivier Dolbeau
October 02, 2015
Programming
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Slicing up a monolithic application Why and how?
Talk given with Benjamin Fraud (@bench1ps) at Paris Web 2015
Olivier Dolbeau
October 02, 2015
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Transcript
Slicing up a monolithic application Why and how?
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Slicing up a monolithic application Why and how?
What is a monolithic application?
“It does everything, even coffee” - Every developer ever
Website
Mobile apps
So big!
406 187 NLOC There are “only” 268 041 NLOC for
symfony/symfony
29 582 Commits There are “only” 15 506 commits for
symfony/symfony There are “only” 10 228 commits for joyent/node There are “only” 9 266 commits for twbs/bootstrap There are 44 809 commits for rails/rails (but it’s ruby… #troll)
75 contributors There are 1 193 contributors for symfony/symfony
20 minutes to deploy the application
“Everything should be made as simple as possible but not
simpler” Albert Einstein
None
➚ Pragmatism “Just get it done, ok?” - God
➚ Processes - “Let’s sync!” - “No way man” -
A developer and an ops, on a friday evening
➚ Learning “It must be somewhere in that file” -
A struggling mentor
➘ Conflicts “I’ve been rebasing for years, kill me now”
- A Git enthusiast
➘ Time consuming “The script has been frozen for 30
minutes, should I worry?” - A worried developer
➘ Maintenance “It works, but I can’t figure out why”
- Both of us
➘ Lack of expertise “I’ve only been there for 3
years for God’s sake!” - A senior developer
➘ Side effects “The website is broken” - A user
on Twitter
With minor change comes major bugs.
With minor change comes major bugs. Olivier, based on its
personal experience.
Objectifs BlaBlaCar today.
countries NEW IN 2015 India Mexico Hungary Romania Serbia Croatia
19
Exponential growth 20 million members in April 2015
What are micro- services?
Users Ratings Notifications Moderation Trips
Objectives - Going worldwide - Fast growing community
BlaBlaCar is deploying multiple datacenters.
We need to localize our data.
Different needs mean different storage.
There are only two hard things in Computer Science: cache
invalidation and naming things. Phil Carlton
The gateway
Business Data
- How to make it easier for everyone to work
together? - How to avoid conflicts? - How to foster expertise?
- Micro-startups - Independant teams - Focus on a specific
domain - Multi-skills - Limited lifespan Team work
None
- Easy to understand - Fast to test, fast to
deploy - Framework - Open-source - No more conflicts
- Long to bootstrap - Specific projects to handle configuration
- Increases ops complexity
None
Micro services are not a silver bullet!
Migrate from monolithic to micro services can be a pain.
t is worth it if you need it!
• Micro services are not a silver bullet! • Migrate
from monolithic to micro services is a pain. • It is worth it if you need it! Benjamin Fraud @bench1ps Olivier Dolbeau @odolbeau