Design a comprehensive system architecture for a global e-commerce platform expecting 10 million daily active users. The system must be based on microservices. Address the following points in your design: 1) Strategy for handling eventual consistency across inventory, orders, and payment services. 2) Implementation of circuit breakers and bulkheads to prevent cascading failures. 3) Choice of communication protocols (synchronous vs. asynchronous) for different inter-service interactions. 4) A detailed approach for database sharding to manage high write loads. Provide a high-level diagram description and a justification for your technology choices.