Worked on improving the stability and performance of the memtable flush path in the apache/doris repository, focusing on concurrency and deadlock prevention during periods of high write throughput. Addressed a critical bug by merging redundant mutex locks within the _flush_memtable_async function, which reduced lock contention and improved flush throughput. This C++ development effort emphasized concurrent programming and performance optimization, resulting in higher write stability and lower latency under peak load. The changes enhanced code maintainability by simplifying mutex usage, minimized deadlock risks, and preserved backward compatibility, as no public API was altered while runtime reliability and predictability were improved.