During September 2024, Kaifeng Gu focused on enhancing data reliability in the cubefs/cubefs repository by developing a new file writing utility in Go. He introduced fileutil.WriteFileWithSync, replacing direct os.WriteFile usage to ensure that CRC files are immediately synchronized to disk after writing. This approach addressed potential data corruption risks by guaranteeing that file changes are persisted even in the event of a crash. Kaifeng also implemented comprehensive tests to validate the new method’s behavior under various scenarios, demonstrating backend development, file handling, and testing skills. His work provided a targeted, robust solution to improve file integrity within cubefs.