Author

Su San Talks Tech

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.

937

Articles

Likes

2.6k

Views

Comments

Latest from Su San Talks Tech

100 recent articles max

Su San Talks Tech

May 20, 2026 · Artificial Intelligence

Why Convert Docs to Markdown for LLMs? Meet the Open‑Source MarkItDown Tool

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.

Azure Document IntelligenceCLILLM preprocessing

0 likes · 6 min read

Why Convert Docs to Markdown for LLMs? Meet the Open‑Source MarkItDown Tool

Su San Talks Tech

May 19, 2026 · Interview Experience

Designing a Hundred‑Billion‑Scale Message Queue: A ByteDance Interview Walkthrough

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.

High ThroughputKafkaMessage Queue

0 likes · 12 min read

Designing a Hundred‑Billion‑Scale Message Queue: A ByteDance Interview Walkthrough

Su San Talks Tech

May 18, 2026 · Frontend Development

A Game-Changing AI‑Powered PPT Skill You Must Try

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.

AI agentsFrontenddesign system

0 likes · 13 min read

A Game-Changing AI‑Powered PPT Skill You Must Try

Su San Talks Tech

May 18, 2026 · Artificial Intelligence

How to Guarantee Reliable Function Calling in LLM Agents

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.

LLMPrompt EngineeringPydantic

0 likes · 17 min read

How to Guarantee Reliable Function Calling in LLM Agents

Su San Talks Tech

May 17, 2026 · Databases

Why Leading Companies Avoid NULL Values in MySQL

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.

Database DesignIndex OptimizationMySQL

0 likes · 11 min read

Why Leading Companies Avoid NULL Values in MySQL

Su San Talks Tech

May 17, 2026 · Information Security

Nginx’s 18‑Year‑Old RCE Flaw Exposes One‑Third of Websites

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.

CVE-2026-42945NginxRCE

0 likes · 11 min read

Nginx’s 18‑Year‑Old RCE Flaw Exposes One‑Third of Websites

Su San Talks Tech

May 15, 2026 · Artificial Intelligence

Step-by-Step Beginner’s Guide to Getting Started with Codex

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.

AI assistantAppAutomation

0 likes · 16 min read

Step-by-Step Beginner’s Guide to Getting Started with Codex

Su San Talks Tech

May 15, 2026 · Artificial Intelligence

Understanding Rerank in Retrieval‑Augmented Generation (RAG)

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.

Cross-EncoderLLMModel selection

0 likes · 15 min read

Understanding Rerank in Retrieval‑Augmented Generation (RAG)

Su San Talks Tech

May 13, 2026 · Artificial Intelligence

Cut Claude Code Token Costs by Up to 89% with the Open‑Source RTK CLI

RTK is a high‑performance CLI proxy that filters and compresses command output before it reaches Claude Code’s 200k‑token LLM context, reducing token consumption by 60‑90% and cutting costs up to 89%, with step‑by‑step installation and usage instructions provided.

CLIClaude CodeLLM

0 likes · 5 min read

Cut Claude Code Token Costs by Up to 89% with the Open‑Source RTK CLI

Su San Talks Tech

May 12, 2026 · Artificial Intelligence

Managing All Claude Code AI Sessions with the New Agent View

Claude Code’s new Agent View lets developers open a single terminal interface to launch, monitor, and control multiple AI coding sessions, offering commands for background tasks, a Peek preview panel, Attach deep‑dive mode, git worktree isolation, status icons, and a full shortcut reference, all without losing sessions when terminals close.

AI codingAgent ViewCLI

0 likes · 10 min read

Managing All Claude Code AI Sessions with the New Agent View