dbaplus Community

Jul 11, 2026 · Operations

How rsync Solved the Bandwidth‑vs‑Difference Deadlock with Rolling Checksums

The article explains why synchronizing a 10 GB file across a slow link seems impossible, describes the classic deadlock of needing the difference without sending the whole file, and shows how rsync’s rolling checksum, weak/strong fingerprinting, and sliding‑window design break that deadlock efficiently.