Scaling Out

What this post added

This post details the engineering challenges and solutions involved in establishing a second datacenter on the East Coast. It explains the need for this expansion due to latency, space, and disaster recovery concerns. The core technical contributions described are the implementation of a modified MySQL replication stream to handle cache consistency issues with secondary datacenters and the use of load balancers and cookies to manage traffic routing and ensure data consistency for users across different datacenters.