Explores Remote Procedure Call as pattern for microservices architecture, comparing to message queues. Demonstrates JSON-RPC for message formatting with Redis pub/sub system for message distribution, showing how client waits for RPC return results while message queues typically trigger jobs without reply requirements.

Demonstrates using Redis as an in-memory data store for sorting World of Warcraft auction house data retrieved from Battle.net API. Uses YAJL for fast JSON parsing, stores auction data in Redis sorted sets for quick lookup by item, and showcases Redis alongside MongoDB in NoSQL applications.