Large-scale Internet Services in Scala at Twitter

We'll present three case studies of systems design in Scala.

• A stateless service for inspecting and routing traffic.
• Long-lived, stateful services for caching tweets and processing vector and graph data.
• A reliable, high throughput message queue with disk journaling.

We'll discuss features of Scala that lend themselves to building these systems. Namely, the benefits of Scala's rich type system, lazy evaluation, higher-order functions, immutability, and ease of integration with existing Java libraries and tools.

Additionally, we'll cover some challenges we've faced in adopting Scala.