redis Archives - ITNotes

Distributed Lock with Redis and Redisson: Preventing Race Conditions in Multi-Node Systems

October 12, 2026

Horizontal scaling breaks JVM-level mutexes and native locks. Learn how race conditions cause overselling in distributed clusters and how to implement robust distributed locking with Redis and Redisson in Java Spring Boot.

Database

Prevent Redis Cache Stampede: Mutex Locking vs Probabilistic Early Expiration (XFetch)

October 10, 2026

Cache stampedes can crush databases when high-traffic keys expire. Discover how to resolve dogpiling by comparing distributed mutex locks with the probabilistic XFetch algorithm in Redis and Python.

Database

Redis Streams: Consumer Groups, XADD, XREADGROUP and Dead Letter Queue Best Practices

October 8, 2026

Redis Streams give you a persistent message queue with consumer groups, delivery guarantees, and dead letter queue support — all without leaving your existing Redis setup. This guide walks through XADD, XREADGROUP, consumer group configuration, and a practical reaper pattern for handling failed messages.

Programming

Building a Distributed Task Queue with BullMQ, Redis, and TypeScript

October 2, 2026

Offloading heavy workloads requires a resilient queuing architecture. This guide covers how to build a production-grade distributed task queue using BullMQ, Redis, and TypeScript, complete with exponential retries and dead-letter queues.

Programming

Stop Using Fixed Window: Build a Robust Sliding Window Rate Limiter with Redis and Node.js

August 12, 2026

Is your API protection leaking? Learn why Fixed Window rate limiting fails and how to build a precise Sliding Window system using Redis and Node.js.

Database

Scaling Real-time Leaderboards to 10M+ Users with Redis Sorted Sets

June 13, 2026

Is your database struggling with ranking millions of users? Learn how we migrated to Redis Sorted Sets to achieve sub-millisecond leaderboard updates at scale.

Database

Valkey: Install, Configure, and Migrate from Redis After the License Change

June 2, 2026

After Redis Ltd. changed its license to SSPL in 2024, our team migrated three environments to Valkey — the Linux Foundation-backed BSD fork. Six months in, here's the full guide: installation, configuration, and proven zero-downtime migration strategies from Redis to Valkey.

Database

Scaling Beyond Redis: A Hands-On Guide to DragonflyDB

June 2, 2026

Redis is fast, but its single-threaded nature wastes modern multi-core power. This guide shows you how to migrate to Dragonfly to achieve significantly higher throughput with less architectural complexity.

Security

Hardening Redis for Production: A Practical Guide to ACLs, TLS, and Isolation

May 23, 2026

Redis is fast, but its default settings are a security risk. Learn how to implement ACLs, TLS, and network isolation to protect your production data.

Database

Defeating Cache Penetration: Why I Switched to Redis Bloom and Cuckoo Filters

May 18, 2026

Is your database crashing from cache misses? Discover how Redis Bloom and Cuckoo Filters can block bot attacks and save your backend from Cache Penetration.