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Tech Freedom Circle
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Tech Freedom Circle

Crazy Maker Circle (Tech Freedom Architecture Circle): a community of tech enthusiasts, experts, and high‑performance fans. Many top‑level masters, architects, and hobbyists have achieved tech freedom; another wave of go‑getters are hustling hard toward tech freedom.

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Recent Articles

Latest from Tech Freedom Circle

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Tech Freedom Circle
Tech Freedom Circle
Jan 12, 2026 · Backend Development

Why Sentinel Fails for Per‑User Hourly Limits and How Redis + Lua Solves It

The article compares four user‑level rate‑limiting approaches—Sentinel hotspot parameters, Sentinel ordinary flow control with cluster mode, Redis ZSet + Lua scripts, and Guava RateLimiter—explaining why Sentinel is unsuitable for long‑window low‑frequency limits and why Redis + Lua is the optimal solution for high‑traffic e‑commerce scenarios.

Distributed ConsistencyLong WindowLua
0 likes · 26 min read
Why Sentinel Fails for Per‑User Hourly Limits and How Redis + Lua Solves It
Tech Freedom Circle
Tech Freedom Circle
Jan 6, 2026 · Backend Development

Why Choose RocketMQ Over Kafka? The Real Reasons Behind the 90% Mistake

This article dissects a common interview question about Kafka's higher throughput versus RocketMQ's richer features, explains the underlying design philosophies, storage models, I/O paths, scaling limits, real‑world use cases such as transaction, delayed and ordered messages, and provides concrete optimization steps and code samples to help engineers make an informed messaging platform choice.

JavaKafkaMessage Queue
0 likes · 42 min read
Why Choose RocketMQ Over Kafka? The Real Reasons Behind the 90% Mistake
Tech Freedom Circle
Tech Freedom Circle
Jan 5, 2026 · Artificial Intelligence

A Three‑Step Guide to Mastering RAG Semantic‑Loss Interview Questions

RAG (Retrieval‑Augmented Generation) is a hot interview topic, and many candidates stumble on semantic‑loss issues; this article dissects a real JD interview case, identifies three core shortcomings, and presents a three‑step technical solution—structure restoration, semantic splitting, and hybrid retrieval—plus a ready‑to‑use answer template.

AI InterviewDocument ParsingHybrid Search
0 likes · 25 min read
A Three‑Step Guide to Mastering RAG Semantic‑Loss Interview Questions
Tech Freedom Circle
Tech Freedom Circle
Jan 4, 2026 · Backend Development

Choosing Between String, StringBuilder, and StringBuffer for Concatenating 100 Million Strings in a JD Interview

The article dissects a JD interview question about concatenating one hundred million strings, comparing String, StringBuilder, and StringBuffer, and explains how immutability leads to object explosion, how StringBuilder’s default capacity causes costly expansions, and why StringBuffer’s synchronized methods become a performance bottleneck in high‑concurrency scenarios.

concurrencygcstring
0 likes · 44 min read
Choosing Between String, StringBuilder, and StringBuffer for Concatenating 100 Million Strings in a JD Interview
Tech Freedom Circle
Tech Freedom Circle
Jan 3, 2026 · Databases

How Many Values Can MySQL IN Handle? 100K‑10M IDs and the Ultimate Solution

An interview scenario reveals that using a massive IN list (hundreds of thousands of IDs) in MySQL quickly exceeds packet limits, forces full‑table scans, and overloads CPU, while batch IN queries cause network storms; the article dissects these pitfalls and presents three progressive strategies—splitting IN, temporary tables with JOIN, and sharding with stream‑merge—to safely query massive ID sets.

IN clauseMySQLQuery Optimization
0 likes · 32 min read
How Many Values Can MySQL IN Handle? 100K‑10M IDs and the Ultimate Solution
Tech Freedom Circle
Tech Freedom Circle
Dec 31, 2025 · Information Security

Unified SSO via Gateway: Multi‑App Auth & Authz and JWT vs Auth vs Authz

This article walks through a complete design and implementation of a unified single sign‑on system using OAuth2.0 authorization‑code flow, Spring Cloud Gateway, JWT, Redis, and Nacos, comparing JWT, authentication, and authorization while presenting performance metrics, security considerations, and interview‑ready answers.

AuthenticationAuthorizationJWT
0 likes · 59 min read
Unified SSO via Gateway: Multi‑App Auth & Authz and JWT vs Auth vs Authz
Tech Freedom Circle
Tech Freedom Circle
Dec 30, 2025 · Backend Development

How Java Virtual Threads Supercharge Spring Boot: 3× QPS Boost and 67% Memory Savings

This article explains how Java's new virtual threads (Project Loom) can transform Spring Boot applications, delivering up to three‑fold QPS improvements and up to 67% lower memory usage, by replacing heavyweight platform threads with lightweight coroutine‑style execution, and provides detailed comparisons, benchmarks, code samples, and migration guidance.

JavaPerformanceProject Loom
0 likes · 51 min read
How Java Virtual Threads Supercharge Spring Boot: 3× QPS Boost and 67% Memory Savings
Tech Freedom Circle
Tech Freedom Circle
Dec 20, 2025 · Backend Development

How SpringBoot Loads Classes: Deep Dive into ClassLoaders and Bean Creation

This article dissects the SpringBoot class‑loading mechanism, explaining how the JVM parent‑delegation model is selectively overridden with custom class loaders like LaunchedURLClassLoader and RestartClassLoader, and how these changes integrate with Spring's bean lifecycle, auto‑configuration, and practical troubleshooting techniques.

JavaSpringSpringBoot
0 likes · 37 min read
How SpringBoot Loads Classes: Deep Dive into ClassLoaders and Bean Creation
Tech Freedom Circle
Tech Freedom Circle
Dec 17, 2025 · Backend Development

Thread Pool: Shared vs Exclusive – How to Choose the Right Strategy for Critical Java Services

This article dissects the interview question “Should thread pools be shared or exclusive?” by exposing common pitfalls, presenting a systematic analysis of isolation versus reuse, and illustrating best‑practice designs with concrete RocketMQ examples, code snippets, and decision‑making guidelines.

Java concurrencyRocketMQThread Pool
0 likes · 22 min read
Thread Pool: Shared vs Exclusive – How to Choose the Right Strategy for Critical Java Services