FIFO KV-Ratio Compaction for BlobDB-Backed TTL Workloads

RocksDB 11.0 added CompactionOptionsFIFO::max_data_files_size and CompactionOptionsFIFO::use_kv_ratio_compaction for a specific but important shape of workload: FIFO compaction, integrated BlobDB, large values, point lookups, and data that naturally expires by TTL or by a bounded data-size budget. The implementation was added in pull request #14326 . The goal is to keep FIFO’s low write amplificat