In November 2025, Sunhao refactored the Redis command parser in the apache/brpc repository, transitioning it from a recursive approach to a state-machine design using C++. This change improved parsing throughput and stack safety, addressing performance and reliability concerns under high concurrency. By explicitly managing parser states, Sunhao enhanced error handling and maintainability, reducing the risk of recursion-related issues. The work established a foundation for future optimizations and facilitated easier testing of the parser. Focused on system programming and performance optimization, Sunhao validated the improvements under load, resulting in more reliable and efficient Redis command processing within the brpc framework.