Worked on the scylladb/scylladb repository to enhance stability and correctness in mutation processing by addressing resource management challenges. Focused on the lifecycle of mutation readers and writers, the developer implemented a solution in C++ using asynchronous programming techniques to ensure reliable resource cleanup. By wrapping the writer in seastar::futurize_invoke, they guaranteed that the mutation reader would be properly closed before the writer’s destruction, reducing the risk of resource leaks and incomplete data processing under load. This work did not introduce new features but concentrated on improving robustness and reliability through careful attention to resource management and concurrency control.