countries; How to scale with Symfony2 @odolbeau & @genes0r 25+ million members in 22 countries; How to scale with Symfony2? Benjamin De Bernardi - Olivier Dolbeau
countries; How to scale with Symfony2 @odolbeau & @genes0r 15M 20M 10M 5M 1M 2015 2014 2013 2012 2011 2010 2009 25M members worldwide Over 25 million members and growing 1.5 million+ joining each month
countries; How to scale with Symfony2 @odolbeau & @genes0r 1. The past 2. Why symfony? 3. How? ◦ How to deal with 22 countries? ◦ Why do we love the EventDispatcher? ◦ Performance & asynchronous ◦ Doctrine 4. Traps 5. Here & now Talk overview:
countries; How to scale with Symfony2 @odolbeau & @genes0r ➔ One codebase for each country? ➔ Conditions everywhere in the code? ➔ Configuration and Context? 22 countries: how can we manage specificities?
countries; How to scale with Symfony2 @odolbeau & @genes0r ➔ One codebase for each country? ➔ Conditions everywhere in the code? ➔ Configuration and Context? 22 countries: how can we manage specificities?
countries; How to scale with Symfony2 @odolbeau & @genes0r Web request Listener Symfony parse & build a Request object Build Context from configuration and Request Response 22 countries: Configuration & Context
countries; How to scale with Symfony2 @odolbeau & @genes0r 1 file for each country 100+ configuration keys Inheritance Toggling of features Metadata 22 countries: Configuration & Context Configuration:
countries; How to scale with Symfony2 @odolbeau & @genes0r EventDispatcher how it works: Lot of code, how to keep events clean? Event Dispatcher Event Listener Listener
countries; How to scale with Symfony2 @odolbeau & @genes0r User A rates User B: Lot of code, how to keep events clean? Event Dispatcher New Rating Grade Listener Recalculate the grade of both users
countries; How to scale with Symfony2 @odolbeau & @genes0r User A rates User B: Lot of code, how to keep events clean? Event Dispatcher New Rating Grade Listener Moderation Listener Ask for content verification
countries; How to scale with Symfony2 @odolbeau & @genes0r Lot of code, how to keep events clean? Registering a listener: • Update a configuration file
countries; How to scale with Symfony2 @odolbeau & @genes0r + Perfect to decouple code inside the app. + Small listeners, easy to understand, to test. + Easy to dispatch events outside application. - Sometimes, hard to understand the flow. - Need tools/rules to keep a common logic. Dispatching events Pros/Cons
countries; How to scale with Symfony2 @odolbeau & @genes0r ▪ Avoid Entities ▪ Keep listener small and dedicated to a single task ▪ Limit dependencies Dispatching events one last thing:
countries; How to scale with Symfony2 @odolbeau & @genes0r Solution: All side tasks can be done asynchronously Tasks: • Find a tool to transmit messages • Create workers • Use the event dispatcher
countries; How to scale with Symfony2 @odolbeau & @genes0r Dispatch Event with the EventDispatcher. • Sent from anywhere • Listened with RabbitMQ or internal Listeners
countries; How to scale with Symfony2 @odolbeau & @genes0r Check eventName & event interface Dispatch the event in the application Decorated EventDispatcher. Publish to RabbitMQ
countries; How to scale with Symfony2 @odolbeau & @genes0r + Perfect to decouple code + Small workers, easy to understand + Easy to dispatch events outside application + Separate projects & deployment + Scalable! - Learning curve - Need tools/rules to keep a common logic - Hard to test a complete flow with mock/stubs - Mapping is time consuming Asynchronous event & process Pros/Cons
countries; How to scale with Symfony2 @odolbeau & @genes0r 129 workers Mail SMS Publication Push Indexation Image resizing Alerts Profile completion I love workers! Payment
countries; How to scale with Symfony2 @odolbeau & @genes0r Asynchronous workers, Symfony: + Access to Entities + Every already defined services - Entire Symfony - Not dedicated - Deployed along the website - Not the main goal of Symfony - High memory usage
countries; How to scale with Symfony2 @odolbeau & @genes0r Asynchronous workers, Standalone: + Dedicated to a single task/type + Maintainable small code + Deployed independently + Easily created & tested - Component splitting from the codebase - More monitoring
countries; How to scale with Symfony2 @odolbeau & @genes0r Doctrine Pros/Cons + Quick to bootstrap a new project + Quick to code a small project - Hard to respect MVC - Hard to deal with cache - Hard to deal with integrity problems in DB - Not made to decouple code (relations). - Not made to scale.
countries; How to scale with Symfony2 @odolbeau & @genes0r Problems solved? + Use symfony only as a tool + Work a lot on onboarding + Try to decouple everything with components - We still have one big application - As everyone, we lack of documentation
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