The article investigates a Java GC slowdown problem linked to the continuous growth of the JVM's SystemDictionary when repeatedly creating XStream objects, explains how classloader choices affect this behavior, and validates the hypothesis through performance profiling and VM code modifications.
This guide explains grep's core concepts, syntax, and options, covering basic and extended regular expressions, character classes, quantifiers, anchors, grouping, and backreferences to help you efficiently filter and search text on the command line.
This article shares Tencent's seven practical bandwidth‑saving techniques—ranging from disabling auto‑play to intelligent pre‑push, file compression, on‑demand usage, segmented download, technical breakthroughs, and content compliance—to dramatically reduce operational costs while maintaining user experience.
Learn how to ensure high‑quality Java code throughout agile development by standardizing coding conventions, applying static analysis, writing unit tests, implementing continuous integration, and conducting thorough code reviews and refactoring, with practical tool recommendations and best‑practice guidelines for each step.
This article outlines the evolution of payment systems, describes a three‑stage architecture model, details the end‑to‑end payment workflow, presents typical industry designs, and provides practical guidance on system, JVM, service, database, call‑chain, and business monitoring using tools like Zabbix, Flume, Kafka and Spark.
This article presents a series of data‑science questions and expert answers covering overfitting, experimental design for user behavior, the distinction between tall and wide data, detecting chart junk, outlier detection methods, extreme‑value theory for rare events, recommendation‑engine fundamentals, and techniques for visualizing high‑dimensional data.
This article explains how IO aggregation, RAID write penalties, and different business models such as OLTP, OLAP, VDI, and SPC‑1 affect storage performance, detailing FC bandwidth calculations, cache acceleration, and the impact of read/write ratios on RAID configurations to guide practical performance evaluation.
The article traces DevOps from its 2008 Agile conference origins, explains the CALMS cultural model, compares traditional, DevOps 1.0 and DevOps 2.0 practices, and highlights containers, continuous deployment, and micro‑services as the key technologies shaping today’s enterprise software delivery.
This article introduces Vue.js fundamentals, compares its similarities and differences with React, demonstrates a sample project structure with component examples, and guides readers on obtaining the demo repository and exploring Vue 2.0 enhancements, providing a practical hands‑on overview for front‑end developers.
This article explains why iOS apps must use the In‑App Purchase API, outlines the configuration and purchase flow, details subscription handling, receipt verification, security risks, pricing models, and common pitfalls for both iOS and Android platforms.
This article explains how excessive use of String.intern can enlarge the JVM's StringTable, causing the Young Generation Garbage Collection (YGC) to take longer, and provides a demo, code analysis, and practical tips for diagnosing and mitigating the slowdown.
This article explains how Taobao achieves horizontal scalability by adopting stateless session handling, efficient client‑side cookie storage, multi‑level caching, service splitting with HSF, database sharding via TDDL, asynchronous messaging, unstructured data storage, and comprehensive monitoring and configuration management.
This guide explains the RPM package naming rules, essential rpm commands for installing, erasing, querying, verifying, and upgrading packages, as well as YUM configuration, repository definition, and common YUM commands for managing software on Red Hat‑based Linux systems.
This guide walks through MySQL fundamentals—including how to create, modify, and drop views, use triggers for automated actions, write and execute stored procedures and functions, design various index types, manage transactions, and apply best‑practice tips for optimal performance.
This article examines the common causes of high read latency in HBase—such as full GC, region‑server imbalance, low write throughput, and inefficient client settings—and provides concrete optimization steps for the client, server, column‑family design, and HDFS layers to dramatically improve performance.
The article critiques popular but unnecessary log‑analysis features—such as sub‑second alerts, endless pagination, flashy maps, full SQL support, bulk downloads, and live tail—arguing that focusing on practical alert content, efficient querying, and proper architecture yields far more value for IT operations.
The 2016 Global Agile Operations Summit in Shanghai concluded with a series of expert sessions covering agile DevOps trends, cloud‑native automation platforms, database performance tuning, container orchestration, and real‑world case studies from leading companies, followed by the award ceremony honoring ten MVPs who drove innovation across operations and infrastructure.
The article describes how Alibaba leverages big data, cloud computing and AI through its “City Brain” project and security platforms to improve urban traffic management, public safety, anti‑fraud measures and e‑commerce risk control, illustrating the transformative impact of data‑driven technologies on modern social governance.
This article explores the fundamentals and advanced techniques of building web crawlers, covering crawler types, essential features, RSS/ATOM harvesting, custom scraping methods, PHP header manipulation, regex extraction, and concurrency, providing actionable code examples for backend developers.
This article explains core OO architecture principles such as low coupling and high cohesion, outlines methods to reduce coupling, advocates composition over inheritance, and provides concise overviews of widely used design patterns like MVC, MVVM, Factory, Singleton, Builder, and many others.
