Seasoned Java and mobile developer with years of experience, specializing in mini‑programs, public accounts, and full‑stack front‑end development. In the AI era, I continuously learn to broaden my knowledge and evolve. I revived a public account I started a decade ago during a dessert‑startup venture, using code as a vessel and knowledge as a companion. I share personal projects, technical articles, programming tips, and growth insights—let’s improve together and set sail.
This guide covers real-world diagnosis and resolution of Java thread deadlocks and thread pool exhaustion — the two most common causes of service hangs with zero errors — using jstack, Arthas, and thread-state analysis to pinpoint root causes and apply permanent fixes.
This article provides a comprehensive guide to troubleshooting Java CPU 100% spikes in production, covering root cause categories, a standard SOP using top, jstack, and thread analysis, a real-world infinite loop case study, GC-related CPU issues, emergency mitigation steps, and long-term prevention practices.
This guide details five essential Linux commands—top, free, df, netstat, and tcpdump—for diagnosing server-level CPU, memory, disk, and network bottlenecks that cause Java application failures, providing field interpretations, anomaly thresholds, and a step-by-step troubleshooting workflow.
This article provides a comprehensive practical guide to MySQL master-slave replication, covering synchronization principles, three replication modes, delay causes and troubleshooting, read-write splitting implementation with common pitfalls, failover strategies, and five production pitfalls to avoid.
This guide teaches how to read Java GC logs field by field, distinguish Minor/Major/Full GC, apply production-ready criteria to judge normal vs abnormal GC, and resolve four common GC anomaly scenarios with root-cause analysis and solutions.
This guide demonstrates how to use Arthas, Alibaba's open-source Java diagnostic tool, to troubleshoot production issues without downtime—covering installation, core commands (dashboard, trace, watch, stack, logger, redefine), three real-world case studies, and critical production safety rules.
This article contrasts junior developers' trial-and-error debugging with senior engineers' structured four-step method — confirm symptoms, layer-by-layer isolation, evidence-based root-cause analysis, and closed-loop remediation — to cut production incident resolution from hours to minutes.
This article explains MySQL's MVCC mechanism in InnoDB, detailing how hidden fields, undo logs, and Read Views enable lock-free snapshot reads, the differences between RC and RR isolation levels, why MVCC prevents non-repeatable reads but not phantom reads, and common pitfalls like long transactions causing undo log bloat.
This comprehensive guide explains MySQL transaction isolation levels (Read Uncommitted, Read Committed, Repeatable Read, Serializable) and lock mechanisms (table, row, gap, next-key locks), demonstrating how dirty reads, non-repeatable reads, and phantom reads occur, with practical deadlock prevention strategies and enterprise-level isolation level selection guidelines.
This tutorial explains Red-Black Trees, comparing them with AVL trees, detailing their five properties, three fix operations (recolor, left/right rotations), providing a Python implementation, and covering real-world uses in Java HashMap, Linux kernel, and databases, plus selection guidelines and common pitfalls.
