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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
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 ConsistencyGroup ReplicationKafka
0 likes · 28 min read
How to Prevent Order Loss in a 100k TPS Flash Sale When the Master DB Crashes – 5 Practical Solutions
Tech Freedom Circle
Tech Freedom Circle
Nov 11, 2025 · Backend Development

ThreadLocal Interview Deep Dive: 20‑Minute Analysis, Manual vs Framework Solutions, and a Winning Methodology

This article explains the inner workings of Java's ThreadLocal, why it fails to propagate context in asynchronous scenarios, compares manual passing and decorator‑based approaches, introduces the TransmittableThreadLocal (TTL) library with its CRER workflow, and provides a structured interview answer that showcases deep architectural insight.

ContextPropagationInterviewJava
0 likes · 26 min read
ThreadLocal Interview Deep Dive: 20‑Minute Analysis, Manual vs Framework Solutions, and a Winning Methodology
Tech Freedom Circle
Tech Freedom Circle
Nov 8, 2025 · Interview Experience

What’s the Secret Behind Python’s Multi‑Process, Multi‑Thread & Coroutine Tricks That Top Tech Interviews Demand?

This article breaks down Python’s Global Interpreter Lock, explains when to use multiprocessing, multithreading or asyncio, provides concrete performance benchmarks and a hybrid process‑coroutine pattern, and guides you on choosing the right concurrency model for interview questions.

InterviewPerformancePython
0 likes · 57 min read
What’s the Secret Behind Python’s Multi‑Process, Multi‑Thread & Coroutine Tricks That Top Tech Interviews Demand?
Tech Freedom Circle
Tech Freedom Circle
Nov 5, 2025 · Artificial Intelligence

Elasticsearch: BM25, TF‑IDF, Dense Vectors, kNN, L2 & Cosine Distances, RRF

This article provides a comprehensive technical guide to Elasticsearch’s core retrieval models—BM25 and TF‑IDF—while detailing modern vector‑based search using dense_vector, kNN, L2 and cosine distances, and demonstrates how to combine keyword and semantic results through hybrid search and Reciprocal Rank Fusion (RRF) with practical configuration examples.

BM25ElasticsearchRRF
0 likes · 42 min read
Elasticsearch: BM25, TF‑IDF, Dense Vectors, kNN, L2 & Cosine Distances, RRF
Tech Freedom Circle
Tech Freedom Circle
Nov 4, 2025 · Backend Development

Designing a Non‑Intrusive Spring Cloud SaaS Multi‑Tenant Component for Full‑Stack Data Isolation

The article presents a step‑by‑step, code‑driven design of a Spring Cloud SaaS multi‑tenant solution that balances resource sharing and strict data isolation by using a shared‑database, shared‑schema approach with tenant_id filtering, ThreadLocal context, MyBatis‑Plus interceptors, Redis key prefixing, Sa‑Token session segregation, and Spring Boot auto‑configuration.

Multi‑tenantMybatis-PlusRedis
0 likes · 16 min read
Designing a Non‑Intrusive Spring Cloud SaaS Multi‑Tenant Component for Full‑Stack Data Isolation
Tech Freedom Circle
Tech Freedom Circle
Nov 3, 2025 · Backend Development

How to Build a Custom Spring Cloud Starter for Dynamic Gray Release

This article walks through the design and implementation of a self‑developed Spring Cloud LoadBalancer starter that supports dynamic gray routing, explaining why the default round‑robin strategy is insufficient, dissecting Spring Cloud LoadBalancer internals, and providing step‑by‑step code, Nacos configuration, and verification scripts to achieve safe, weighted traffic shifting during releases.

Gray ReleaseMicroservicesNacos
0 likes · 19 min read
How to Build a Custom Spring Cloud Starter for Dynamic Gray Release
Tech Freedom Circle
Tech Freedom Circle
Oct 29, 2025 · Backend Development

Combining RocketMQ Transaction Messages, Local Message Table, and XXL‑Job for 10‑100k QPS Distributed Transactions

This article presents a detailed design for a high‑concurrency (10‑100k QPS) distributed transaction solution that integrates RocketMQ transactional messages, an eBay‑style local message table, and XXL‑Job reconciliation to achieve eventual consistency while handling failures, retries, and data‑explosion challenges.

CAP theoremJavaLocal Message Table
0 likes · 34 min read
Combining RocketMQ Transaction Messages, Local Message Table, and XXL‑Job for 10‑100k QPS Distributed Transactions