A MySQL server experienced max_connection errors due to lingering sleep connections caused by mismatched timeout settings between LVS and HAProxy, and adjusting HAProxy's timeout resolved the issue and prevented further connection exhaustion.
A comprehensive, English-language cheat sheet that explains Git terminology and provides ready-to-use command snippets for initializing repositories, configuring settings, managing files, committing changes, handling branches, tags, viewing history, synchronizing remotes, and undoing actions.
This article explains how to use Nginx's various load‑balancing strategies together with Tomcat clustering and session‑sharing techniques to build a resilient, high‑availability web service, covering both simple static‑page scenarios and session‑dependent applications.
ButterKnife is a compile‑time, annotation‑based dependency injection library for Android that uses JavaPoet‑generated helper classes to replace repetitive findViewById calls, offering faster development and runtime performance while adding a modest number of auxiliary classes and a one‑time reflection cost.
This article examines how increasing software productivity drives the evolution of development models—from traditional waterfall through agile to microservices—and how full‑feature teams adapt production relations to maximize efficiency and creativity.
This guide introduces Yarn, Facebook’s fast JavaScript package manager, shows how to install it, and provides a side‑by‑side comparison of common npm commands with their Yarn equivalents, highlighting unique features of each tool for more efficient frontend development.
This article presents the design, implementation, and ongoing improvements of Qunar's network device operations platform, detailing its background, optimization strategies, permission model, automated tasks, monitoring capabilities, and how it enhances operational efficiency while reducing risk.
This article describes Ctrip's challenges with traditional hardware and cloud WAFs, presents a low‑cost, DNS‑based cloud WAF solution, and details its closed‑loop design, rule management, big‑data analytics, and machine‑learning techniques for accurate web security protection.
In his Yunqi Conference keynote, Alibaba CTO Zhang Jianfeng explains how soaring computing power, digitalization, AI, IoT and immersive technologies will transform retail, manufacturing and services into intelligent, personalized ecosystems, illustrating the vision with examples like a smart golf club and a city‑wide data brain.
The article explores emerging UX trends for 2017—including fault diagrams, micro‑micro interactions, weather‑app explosions, electronic‑pet aesthetics, haptic feedback, de‑linearized flows, gap‑anxiety mitigation, age‑responsive design, trust building, AI assistant integration, and textile‑inspired interfaces—highlighting how designers can shape more human‑centric digital products.
This guide walks you through installing MySQL on Windows, setting up the Python pymysql driver, using MySQL Workbench for visual database management, and writing basic Python code to create, read, update, and delete records in a MySQL database.
This article explains various load‑balancing scheduling methods—including Round Robin, Weighted Round Robin, Least Connection, Weighted Least Connection, Adaptive Agent‑Based balancing, Fixed Weighted, Weighted Response, and Source IP Hash—detailing how each works, their ideal scenarios, and potential drawbacks.
This article explains why modern enterprises need IT operations that directly support business objectives, outlines fundamental facts about system reliability, cost, and human error, and introduces concrete metrics such as maximum downtime and failure frequency to evaluate operational effectiveness.
The article details how Facebook built Yarn to overcome npm’s consistency, security, and speed limitations, describing the evolution of their package‑management workflow, Yarn’s lockfile architecture, parallel installation process, additional features, production adoption, and simple commands to get started.
This article compares the MVC, MVP, and MVVM architectural patterns for Android mobile development, explains their differences, and provides step‑by‑step code examples for implementing MVP and MVVM, including model, view, presenter layers and data‑binding configuration.
This guide explains how to separate application and data servers, set up load‑balanced clusters with nginx, LVS or keepalived, configure MySQL master‑slave replication and engine choices, and apply database and program‑level optimizations such as prepared statements, indexing, thread pools, and lock strategies to dramatically improve backend performance.
MongoDB replicaSet offers various node roles—including data, arbiter, hidden, voting, and delayed nodes—each with distinct advantages and constraints, and the article explains their purposes, best‑practice configurations, and how to add them using appropriate rs commands for robust, automated failover.
This article examines the design of WeChat's cross‑platform XLog module, detailing how it balances performance, reliability, and security through memory buffering, mmap usage, and efficient compression to provide smooth, loss‑less logging for mobile applications.
This article explains why mock servers are essential for modern inter‑team development, defines mock, outlines its benefits, reviews popular mock tools, and details the design and usage of a custom xMock system for flexible, cross‑platform API simulation.
This article offers practical strategies for junior programmers to improve their coding skills, build a professional portfolio, communicate effectively, and maintain a healthy mindset, helping them stand out in a competitive software development landscape.
