{"id":"fdatasync-safe-for-all-append-paths","text":"Every file opened in append mode (`\"ab\"`) in this codebase writes sequentially with monotonically increasing file size, making `fdatasync` a safe drop-in replacement for `fsync` on those paths (WAL, Bitcask data files, B-tree WAL)","truth_value":"IN","source":"entries/2026/05/29/topic-fdatasync-vs-fsync-optimization.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"fdatasync-safe-for-all-append-paths","truth_value":"IN","reason":"premise"}]}}