Act as a Senior Solutions Architect. Design a microservices architecture for a global e-commerce platform expected to handle 10 million daily active users. Your response must include: 1. A service decomposition diagram description, 2. Database selection strategy (SQL vs. NoSQL) per service with justification, 3. An inter-service communication pattern (synchronous vs. asynchronous), 4. A caching strategy using Redis, and 5. A detailed disaster recovery and failover plan.