Explaining distributed systems and architecture through stories. Author of the "JVM Performance Tuning in Practice" column, open-source author of "Spring Cloud in Practice PassJava", and independently developed a PMP practice quiz mini-program.
A recent security analysis reveals how a malicious contributor infiltrated the open‑source xz compression tool over two and a half years, inserted a backdoor using IFUNC hooks to compromise OpenSSH, and was eventually uncovered due to a CPU‑spike bug, highlighting severe risks for Linux and macOS systems.
This article walks through the step‑by‑step process of turning a single‑server prototype into a highly available, horizontally‑scaled system that can serve over a million users, covering server configuration, database selection, load balancing, caching, CDN, stateless networking, multi‑data‑center deployment, message queues, monitoring, and sharding strategies.
This article details a comprehensive system refactoring project that transformed a monolithic, all‑in‑one architecture into a distributed, micro‑service‑based design with a completely rebuilt database model, covering problem analysis, solution design, phased implementation, testing, and rollout strategies.
This guide explains how to install, configure, and run Prometheus Alertmanager with Docker, set up routing and receivers, integrate it with Prometheus alert rules, test alerts, customize email templates, and optimize notification settings for reliable monitoring and alerting.
This article explains MySQL index structures, covers covered and back‑table queries, details InnoDB transaction isolation levels, classifies various lock types (table, row, gap, next‑key, intention, auto‑inc, metadata), analyzes lock behavior in multiple scenarios, discusses deadlock causes, and provides DDL and online schema‑change recommendations.
This tutorial explains three approaches to sending email in Spring Boot—JavaMailSender, JavaMail API, and Apache Commons Email—compares their advantages and disadvantages, and provides complete Maven dependencies, configuration settings, and ready‑to‑run code examples for each method.
The article argues that, despite Docker’s benefits for stateless services, placing production databases in containers introduces reliability, maintainability, and performance drawbacks that outweigh its conveniences, making it generally an unwise choice for critical data workloads.
This article walks through a real‑world investigation of a pod whose CPU spiked to over 90%, detailing how abnormal JVM garbage‑collection patterns were identified, traced to a specific Java thread, and resolved by fixing an inefficient Excel export routine.
This article demonstrates how to dramatically improve MySQL query performance by analyzing execution plans, adding appropriate single‑column and multi‑column indexes, rewriting subqueries as joins, and applying covering indexes, showing step‑by‑step measurements and visual explanations.
This article explains seven typical message‑queue use cases—including ordinary, ordered, delayed, transactional, trace, dead‑letter, and priority messages—detailing their business motivations, implementation challenges, and concrete code examples for Kafka, RocketMQ, Pulsar, and RabbitMQ.
