Su San, former staff at several leading tech companies, is a top creator on Juejin and a premium creator on CSDN, and runs the free coding practice site www.susan.net.cn.
The article analyzes how Codex is evolving from a code‑writing assistant into a broader computer work system by leveraging durable threads, tool integration, voice‑based control, automations, and verifiable goals, shifting the focus from isolated code tasks to end‑to‑end workflow completion.
The article compares Alibaba’s Druid and Spring Boot’s default HikariCP connection pools, explaining how connection pooling works, presenting benchmark results that show HikariCP’s lower latency and higher TPS, detailing HikariCP’s lock‑free ConcurrentBag and bytecode optimizations, and highlighting Druid’s rich monitoring, SQL firewall and leak detection features to help developers choose the right pool for different scenarios.
The article explains that LLMs process Markdown more effectively than raw PDFs, introduces Microsoft’s open‑source MarkItDown utility that converts a wide range of file types—including PDFs, Word, Excel, HTML, images with OCR, and YouTube videos—into clean Markdown, and provides installation, usage examples, recent feature updates, and a brief critique of its scope.
This article walks through the interview question of designing a message queue that handles billions of messages daily and peaks at millions of QPS, covering traffic calculations, core roles, storage and throughput techniques, scalability, high availability, observability, framework comparisons, a real‑world case study, and key follow‑up interview topics.
The article reviews html-ppt-skill, an AI‑driven tool that generates fully styled HTML presentations instead of PPTX files, detailing its theme, layout, and animation assets, presenter‑mode implementation, cross‑platform skill integration, practical advantages, limitations, and how it exemplifies the emerging AI skill ecosystem.
The article breaks down the reliability challenges of LLM Function Calling, categorizes five failure modes, and presents concrete engineering safeguards such as precise schema design, tool description, constraint enforcement, few‑shot calibration, structured output, validation‑feedback loops, monitoring, and risk‑aware trade‑offs.
The article explains why major tech companies discourage using NULL in MySQL, covering its meaning as an unknown state, three-valued logic pitfalls such as NOT IN subqueries, index inefficiencies, aggregate function quirks, storage overhead, Java handling issues, and offers practical alternatives like NOT NULL constraints with sensible defaults.
A critical Nginx vulnerability (CVE‑2026‑42945, CVSS 9.2) discovered by depthfirst and F5 allows unauthenticated remote code execution via a single crafted HTTP request, affecting versions 0.6.27‑1.30.0 and roughly one‑third of global websites.
This article walks readers through why many users are switching from Claude Code to Codex, explains the two Codex product forms, details installation, account setup, UI navigation, permission choices, and demonstrates practical tasks such as generating reports, PPTs, web searches, automation, and building a snake game via the CLI, while also offering tips to avoid common pitfalls.
The article explains why a reranking step is essential in RAG pipelines, describes how it refines the initial vector‑search results, compares mainstream rerank techniques, discusses practical engineering choices such as candidate set size and model selection, and outlines how to evaluate and tune rerank performance.
