This post discusses the complexities and considerations of implementing garbage collection (GC) for object storage systems at scale. A user comment emphasizes the limitations of bucket policies for comprehensive garbage collection and suggests a write-ahead log (WAL) approach as a viable alternative. This technique involves logging deletions to ensure consistency and resilience against crashes. Additionally, the comment introduces the concept of using probabilistic data structures, such as bloom filters, for efficient mark-and-sweep garbage collection. This method allows for a parallelized approach, improving performance by determining object status with high certainty while managing resource usage effectively.