![]() Shard assignments are from a random number for new accounts AutoIncrement IDs are automated to keep it Active Active. Active Master-Master Ring Replication: a few drawbacks in MySQL 4.1, as honoring commits in Master-Master. PHP logic to connect to the shards and keep the data consistent (10 lines of code with comments!) Every page view, calculate where your data is, at that moment of time. Global Ring: Its like DNS, you need to know where to go and who controls where you go. When making a comment on someone else's’ blog Shards: My data gets stored on my shard, but the record of performing action on your comment, is on your shard. Went to a federated approach so they can scale far into the future:.Take a look in the Information Sources for more details. Lots of excellent material on capacity planning.They needed the ability to make live maintenance, repair data, and so forth, without taking the site down.Too much load and they had a single point of failure. Earlier they suffered from Master-Slave lag.Handle pictures emailed from users by parsing each email is it's delivered in PHP.Use horizontal scaling so they just need to add more machines. ![]() ![]() Create a search farm by replicating the portion of the database they want to search.Scaled at first by replication, but that only helps with reads.Statelessness means they can bounce people around servers and it's easier to make their APIs.Everything (except photos) are stored in the database.Use dedicated servers for static content.Keys (a few different IDs) and a pointer to which shard a users' data can be found on. The central database includes data like the 'users' table, which includes primary user This allows cheaper scaling because you need less hardware as compared to master-master setups which always requires double the hardware. The Dual Tree structure is a custom set of changes to MySQL that allows scaling by incrementally adding masters without a ring architecture. A pretty picture of Flickr's architecture can be found on this slide.Over 400,000 photos being added every day.2 PB raw storage (consumed about ~1.5TB on Sunday.Cvsup for distributing and updating collections of files across a network.Subcon stores essential system configuration files in a subversion repository for easy deployment to machines in a cluster.Ganglia for distributed system monitoring.Squid in reverse-proxy for html and images.A lot of useful PowerPoint presentations. Database War Stories #3: Flickr by Tim O'Reilly.Building Scalable Web Sites by Cal Henderson from Flickr.Federation at Flickr: Doing Billions of Queries a Day by Dathan Pattishall.Flickr has an amazing challenge, they must handle a vast sea of ever expanding new content, ever increasing legions of users, and a constant stream of new features, all while providing excellent performance. That's a lot of hamburgers.įlickr is both my favorite bird and the web's leading photo sharing site. Update: Flickr hits 2 Billion photos served.
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