Top Architect

Apr 8, 2021 · Databases

Redis Multi‑Threading Evolution: Lazy Free and I/O Thread Mechanisms

Redis, traditionally a single‑threaded in‑memory cache, introduces Lazy Free in version 4.0 and multi‑threaded I/O in version 6.0 to mitigate blocking during large key deletions and improve performance, with detailed explanations of event handling, code implementations, limitations, and comparisons to Tair’s threading model.