Sharing Java developer knowledge, practical articles, and continuous insights into computer engineering.
This article explains how to implement a precise sliding‑window rate‑limiting algorithm using Redis Sorted Sets, detailing the problem scenario, the algorithm steps, Lua script implementation, Java integration, and practical extensions for high‑performance backend services.
This article explains why single‑node Redis can become a single point of failure, compares Redis Sentinel and Redis Cluster deployment options, provides step‑by‑step Docker deployment scripts, details Sentinel’s inner workings, demonstrates failover verification, and shares best‑practice recommendations for production environments.
This comprehensive guide walks you through installing Redis on a single server using source compilation and Docker, configuring persistence, memory management, backups, disaster recovery, and systemd service setup, ensuring a production‑ready Redis instance that can handle over 10,000 QPS.
This tutorial walks Java developers through using Redis in Spring Boot projects, covering the essential spring-boot-starter-data-redis dependency, RedisTemplate basics, the underlying RedisConnectionFactory design, custom connection configurations for single‑node and sentinel modes, and seamless integration of the Redisson client for advanced distributed features.
This article examines frequent RocketMQ problems such as duplicate sending, flow‑control throttling, message retries, duplicate consumption, backlog, and loss, and provides practical configuration tweaks, scaling strategies, batch sending, idempotent handling, and retry mechanisms to ensure reliable message delivery.
This article systematically breaks down RocketMQ's core mechanisms—covering message roles, disk storage, push/pull delivery, expiration handling, retry queues, and cluster failover—so developers can understand every stage a message undergoes from creation to cleanup and ensure reliable, high‑performance messaging.
This article presents a comprehensive set of RocketMQ usage guidelines—including topic and tag conventions, producer and consumer group naming, key handling, logging, retry mechanisms, and cluster deployment recommendations—to help engineers build stable, high‑performance, and observable messaging systems in production environments.
This article walks you through installing and using the RocketMQ Dashboard to monitor topics, brokers, producers, consumers, and message details, explains common pitfalls such as client‑ID conflicts in Docker, and demonstrates how to troubleshoot consumption issues, TPS metrics, and dead‑letter handling.
This tutorial walks you through installing RocketMQ 4.9.7, configuring a single‑node setup, then building a production‑grade nameserver cluster and master‑slave broker cluster with all required scripts, directories, and commands for running and shutting down the services.
This article explains the composition of RocketMQ's SendResult object returned after a successful synchronous send, detailing each field such as sendStatus, msgId, offsetMsgId, messageQueue, and queueOffset, and provides practical examples and a full field‑by‑field breakdown for Java developers.
