Tagged articles

active expire

2 articles · Page 1 of 1

Nov 27, 2023 · Databases

How Midnight Key Expiration Spiked Redis CPU and the Optimizations That Fixed It

The article examines a nightly Redis CPU‑100% alert caused by massive simultaneous key expirations, analyzes the active and slow expire cycles, and presents two practical redesigns—randomized expiration with real timestamps and time‑suffix keys—that eliminated the spike.

CPU spikeKey ExpirationRedis

0 likes · 10 min read

How Midnight Key Expiration Spiked Redis CPU and the Optimizations That Fixed It

Wukong Talks Architecture

Jul 29, 2021 · Databases

Redis Expired Key Deletion Strategies: Lazy Deletion and Periodic Deletion

The article explains Redis's two expiration key removal mechanisms—lazy deletion, which removes keys only when accessed, and periodic deletion, which randomly scans and deletes expired keys at regular intervals—detailing their concepts, pros, cons, and underlying source‑code implementations.

DatabaseLazy DeletionRedis

0 likes · 4 min read

Redis Expired Key Deletion Strategies: Lazy Deletion and Periodic Deletion