rb is a Python library for interacting with multiple Redis nodes, providing automatic routing of commands based on keys and broadcasting capabilities. It uses a cluster abstraction to manage connections to individual Redis instances, with routers (partition or consistent hashing) to determine the correct node for key-based operations. The library features a promise-based model for parallel execution, allowing non-blocking I/O via multiplexing (poll/epoll/kqueue) to handle multiple Redis connections efficiently. Key features include automatic batching of compatible commands (e.g., merging multiple GETs into MGET), fault tolerance through reconnection logic, and support for both routed and fanout operations. The codebase is well-structured with clear separation of concerns between cluster management, routing, client interfaces, and utility components.