This guide categorizes common programming questions, explains why some have standard answers, and offers practical techniques—like providing context, searching first, and structuring inquiries—to help developers ask clearer, more effective questions and get useful responses.
The article provides a comprehensive overview of KDD 2017, including acceptance statistics, best paper awards, Ant Group's contributions, detailed discussions on AB testing, graph mining, and selected research papers across data mining, machine learning, and anomaly detection, offering valuable insights for practitioners and researchers.
This article explains why conventional indexes waste space and perform poorly on highly skewed columns, introduces a decode‑based function index that excludes high‑frequency values, details the experimental setup with millions of rows, compares index size and query performance, and outlines the method's limitations.
The article emphasizes that mastering core computer science subjects such as discrete mathematics, algorithms, operating systems, computer architecture, and compilers is essential for building solid programming skills and avoiding future difficulties when learning higher‑level frameworks and languages.
This third‑part guide for Elasticsearch 5+ shows how rounding date ranges, eagerly loading global ordinals for keyword fields, and pre‑loading index files into the OS cache—each illustrated with curl commands—can improve search latency while requiring careful trade‑offs between cache friendliness, query complexity, and resource usage.
This article explains the principles of TCP long connections, compares NIO and BIO models, and describes how Android applications can implement and share persistent connections using AIDL, process sharing, and a dedicated SDK to support push, IM, and other real‑time services.
This article explores the stability, design quirks, and advanced features of Python’s re library—including iterative matching, the undocumented scanner, and strategies for negative matching—showcasing why it remains a cornerstone of the language despite its age.
This article explains why Linux appears to consume most of the memory, clarifies the meaning of the free command’s buffers/cache fields, and demonstrates through a simple experiment how Linux’s caching dramatically speeds up repeated file reads.
A DBA on call discovers a sudden traffic spike caused by a few massive hot keys on a storage server, quickly isolates the issue, migrates data, applies throttling and caching, and outlines automation ideas to prevent future overloads, illustrating practical database operations and incident response.
The article outlines the updates made to the Scrum Guide between 2016 and 2017, detailing added sections on Scrum adoption, role clarifications for Scrum Master and Product Owner, revised daily Scrum practices, timebox definitions, Sprint Backlog improvements, and a clearer description of increments.
The article traces the historical evolution of traditional enterprise storage—from early multi‑controller platforms like HDS USP and EMC DMX, through HDS Hi‑Star VSP, to the engine‑based VMAX architecture—highlighting architectural innovations, scalability limits, and the shift toward cloud‑centric storage services.
This article describes how Ctrip's security team replaced rule‑based web attack detection with a Spark‑powered machine‑learning pipeline, detailing the system architecture, feature engineering using TF‑IDF, model training, evaluation, online deployment, and future enhancements to improve detection accuracy and performance.
This article explains the three main ways modules can call each other—synchronous calls, asynchronous calls, and callbacks—illustrates each with Java code examples, and discusses when to use each approach for flexible and non‑blocking program design.
Understanding JavaScript parsers—such as Esprima, Acorn, and Babylon—reveals how they generate ASTs, validate syntax, prioritize operators, and more, while distinguishing eager from lazy parsing modes in V8, enabling developers to optimize code performance through tools like optimize-js.
This article walks you through replacing Travis CI with Drone, covering Docker‑based installation, configuration of docker‑compose, Nginx reverse proxy, systemd service, pipeline‑as‑code with .drone.yml, secret management, troubleshooting tips, and a concise summary of Drone's strengths and limitations.
This article explains what user profiling is, why it’s crucial for recommendation systems, outlines key dimensions such as personal attributes, status, and interests, describes algorithms like classification and autoregressive models, and details offline and real‑time computation methods, evaluation techniques, and practical examples.
A CentOS web server reports 100% disk usage despite du -sh /* showing far less space used, which is caused by Apache/Tomcat logs being cleared while the services are running, and the issue is resolved by restarting the services and properly cleaning old log files.
This article presents a comprehensive solution for capturing network packets on Android devices without rooting, compares tcpdump, Fiddler and VPNService approaches, describes a cloud‑based architecture using Go, MongoDB and libpcap, and details multiple performance optimizations that eliminate packet loss and dramatically increase CPU utilization.
Learn five practical techniques—image optimization, minimizing HTTP requests, proper file placement, CSS/JS compression, and external linking—to dramatically improve website loading times and security, with actionable tips for both beginners and seasoned developers, plus WordPress-specific recommendations.
He Xiaofeng, JD Mall Infrastructure chief architect, discusses his role in building a real‑time computing platform, applying streaming frameworks, machine learning, and knowledge‑graph techniques to product data mining, improve search accuracy, and outline future research directions.
