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
Dec 14, 2025 · Interview Experience

Interview Is Acting: Must‑Know Answers to Ace Every Question

This comprehensive guide turns interview preparation into a performance, offering a step‑by‑step "now‑past‑future" script for self‑introductions, STAR‑based storytelling for challenging projects, concrete Java OOM troubleshooting examples, and proven tactics for answering why you left, strengths, pressure handling, and salary expectations.

OOMSTARcareer
0 likes · 28 min read
Interview Is Acting: Must‑Know Answers to Ace Every Question
Tech Freedom Circle
Tech Freedom Circle
Dec 13, 2025 · Backend Development

What’s Wrong with Delayed Double Delete? How Top Tech Companies Elegantly Avoid It

The article explains the delayed double‑delete cache‑invalidation pattern, its four major drawbacks in high‑concurrency environments, and presents four production‑grade alternatives—event‑driven binlog updates, distributed‑lock with versioning, write‑through proxy layers, and logical‑delete with async cleanup—used by leading Chinese internet firms to achieve reliable data consistency.

CachingDistributed LockRedis
0 likes · 21 min read
What’s Wrong with Delayed Double Delete? How Top Tech Companies Elegantly Avoid It
Tech Freedom Circle
Tech Freedom Circle
Dec 12, 2025 · Backend Development

Why Redisson’s Reentrant Distributed Lock Relies on HINCRBY Increment and Decrement

The article explains how Redisson implements a re‑entrant distributed lock using Redis hash structures and the atomic HINCRBY command to manage client identity, re‑entry counting, concurrency safety, and graceful release, providing a complete technical analysis with code, Lua scripts, and best‑practice guidelines.

Distributed LockHINCRBYJava
0 likes · 34 min read
Why Redisson’s Reentrant Distributed Lock Relies on HINCRBY Increment and Decrement
Tech Freedom Circle
Tech Freedom Circle
Nov 28, 2025 · Databases

How to Achieve MySQL Sub‑Second Scaling for 100M‑10B Rows (Interview Scenario)

The article analyzes a JD interview question on scaling a MySQL order table from 100 million to billions of rows, detailing four practical expansion strategies—stop‑service migration, double‑write migration, ShardingSphere middleware, and dual‑VIP routing—each with step‑by‑step procedures, code samples, risk assessments, and validation methods to enable near‑instant capacity growth without service interruption.

MySQLShardingSpheredatabase scaling
0 likes · 42 min read
How to Achieve MySQL Sub‑Second Scaling for 100M‑10B Rows (Interview Scenario)
Tech Freedom Circle
Tech Freedom Circle
Nov 18, 2025 · Backend Development

Optimizing Internal HTTP Calls: From Head‑of‑Line Blocking to High‑Performance Microservices

This article dissects the hidden technical debt of internal HTTP APIs, explains why HTTP/1.1 causes head‑of‑line blocking, redundant headers and serialization overhead, and walks through a step‑by‑step, data‑driven optimization roadmap—including HTTP/2, Protobuf, request aggregation, connection pooling, compression, caching, async processing, observability, and safe gray‑release deployment—backed by concrete benchmarks and code samples.

CachingConnection PoolingHTTP/2
0 likes · 32 min read
Optimizing Internal HTTP Calls: From Head‑of‑Line Blocking to High‑Performance Microservices
Tech Freedom Circle
Tech Freedom Circle
Nov 17, 2025 · Backend Development

Spring Design Patterns Interview: The One Question That Can Make or Break Your Offer

This article breaks down Spring’s layered architecture and walks through ten core design patterns—factory, singleton, proxy, template method, observer, adapter, decorator, strategy, chain of responsibility, facade, and delegate—showing how they appear in real interview scenarios and how mastering them can turn a tough interview question into a winning advantage.

JavaSpringSpring Framework
0 likes · 50 min read
Spring Design Patterns Interview: The One Question That Can Make or Break Your Offer
Tech Freedom Circle
Tech Freedom Circle
Nov 16, 2025 · Databases

How Redis Pipeline Can Boost Performance 3‑12× and Impress Interviewers

This article explains Redis Pipeline’s core principle of batching commands to reduce network round‑trips, presents benchmark data showing up to 17‑fold speedups, details real‑world use cases such as cache warm‑up, heartbeat reporting, and high‑traffic events, and provides best‑practice guidelines on batch sizing, error handling, cluster constraints, and comparisons with transactions and Lua scripts.

Batch ProcessingJavaPerformance
0 likes · 36 min read
How Redis Pipeline Can Boost Performance 3‑12× and Impress Interviewers
Tech Freedom Circle
Tech Freedom Circle
Nov 15, 2025 · Databases

How to Prevent Order Loss in a 100k TPS Flash Sale When the Master DB Crashes – 5 Practical Solutions

The article dissects a high‑traffic flash‑sale interview question—how to guarantee zero order loss at 100,000 TPS when the master MySQL instance fails—by explaining the underlying performance‑consistency conflict, the three skills interviewers assess, and presenting five concrete, code‑driven solutions ranging from MySQL parameter tuning to semi‑sync replication, local message tables, group replication, and Redis‑Kafka traffic shaping.

Data ConsistencyFlash SaleGroup Replication
0 likes · 28 min read
How to Prevent Order Loss in a 100k TPS Flash Sale When the Master DB Crashes – 5 Practical Solutions