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 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.
This article explains AVL balanced binary trees, covering the balance factor, four rotation types (LL, RR, LR, RL), a complete Python implementation with height updates, real-world use cases, and a comparison showing AVL's guaranteed O(log n) query performance versus BST's degradation to O(n).
This comprehensive guide covers MySQL read-write separation from fundamentals to production implementation, including master-slave replication principles, replication lag causes and three enterprise-grade solutions, one-master-multi-slave architecture patterns, MHA automatic failover, Sharding-JDBC middleware configuration, and five critical production pitfalls to avoid.
This article explains binary search trees (BST), detailing their left‑small right‑large ordering rule, core properties, and why they outperform ordinary binary trees with O(log n) search, while covering insertion, search, deletion, in‑order traversal code in Python, common pitfalls, and real‑world use cases.
This guide explains why video recordings that upload correctly on a real device can fail after TestFlight or cloud packaging, detailing the mismatched file‑system paths between plus.io, iOS Documents/Library, and Android Movies directories, and provides step‑by‑step fixes to ensure reliable uploads to Alibaba Cloud VOD.
This article introduces binary trees, explains key terminology and four common tree shapes, details four traversal methods, provides a complete Python implementation with sample output, and highlights real‑world uses and beginner pitfalls.
