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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
Aug 18, 2025 · Interview Experience

How to Hand‑Write a Simple AbstractQueuedSynchronizer (AQS) for High‑Pay Java Interviews

This article walks through the fundamentals of Java's AbstractQueuedSynchronizer, covering lock‑queue relationships, CLH lock internals, dummy head nodes, state management, and step‑by‑step implementations of acquire, addWaiter, acquireQueued, shouldParkAfterFailedAcquire, and release methods, complete with runnable example code.

AQSAbstractQueuedSynchronizerJava
0 likes · 29 min read
How to Hand‑Write a Simple AbstractQueuedSynchronizer (AQS) for High‑Pay Java Interviews
Tech Freedom Circle
Tech Freedom Circle
Aug 15, 2025 · Backend Development

Calculating a 100k QPS Rate‑Limiting Threshold: Methods and Best Practices

This article explains how to determine a 100 000‑QPS rate‑limiting threshold by covering the purpose of throttling, the three core elements of limiting, common algorithms, target dimensions, capacity estimation for single‑service and full‑link scenarios, pressure‑testing techniques, monitoring data, and adaptive configuration strategies.

Performance TestingQPSRate Limiting
0 likes · 18 min read
Calculating a 100k QPS Rate‑Limiting Threshold: Methods and Best Practices
Tech Freedom Circle
Tech Freedom Circle
Aug 14, 2025 · Backend Development

10 Proven Techniques to Optimize API Latency from 11 s to 170 ms – A Meituan Interview Case

The article presents a step‑by‑step analysis of how to shrink a 11‑second API response to 170 ms by applying batch database writes, Redis pipeline, asynchronous processing, thread‑pool design, local‑memory buffering, MQ integration, and other performance‑tuning patterns, backed by real‑world benchmarks and code samples.

API optimizationAsyncJava
0 likes · 48 min read
10 Proven Techniques to Optimize API Latency from 11 s to 170 ms – A Meituan Interview Case
Tech Freedom Circle
Tech Freedom Circle
Aug 5, 2025 · Backend Development

How to Diagnose and Fix Sudden Redis Slowdowns: A Complete Five‑Step Guide

This article provides a systematic, step‑by‑step methodology for identifying the root causes of Redis performance degradation—including big keys, slow queries, expiration spikes, memory limits, fork latency, AOF flushing, memory fragmentation, swap usage, huge pages, and CPU binding—and offers immediate mitigation tactics as well as long‑term architectural solutions to restore and maintain high throughput.

CacheMemoryPerformance
0 likes · 50 min read
How to Diagnose and Fix Sudden Redis Slowdowns: A Complete Five‑Step Guide
Tech Freedom Circle
Tech Freedom Circle
Aug 4, 2025 · Operations

How Do Projects Achieve High Availability Without Multi‑Site Active‑Active? – A Meituan Interview Question

The article analyzes high‑availability concepts, from single‑machine risks to multi‑site active‑active architectures, compares cold and hot backup strategies, discusses network latency challenges, and presents Ele.me’s cell‑based, sharding‑driven multi‑region solution with concrete examples, tables, and code snippets.

cell-based architecturedata replicationdisaster recovery
0 likes · 28 min read
How Do Projects Achieve High Availability Without Multi‑Site Active‑Active? – A Meituan Interview Question
Tech Freedom Circle
Tech Freedom Circle
Jul 27, 2025 · Interview Experience

Designing a Payment Middle Platform from Scratch – Core Challenges (Interview Answer)

This article provides a comprehensive guide to designing a payment middle platform from zero, covering its definition, classic middle‑platform types, core architecture, functional modules, fault‑tolerance, security measures, distributed‑transaction strategies, and detailed Java pseudocode, offering interview‑ready insights for architects.

architecturedistributed transactionfault tolerance
0 likes · 39 min read
Designing a Payment Middle Platform from Scratch – Core Challenges (Interview Answer)
Tech Freedom Circle
Tech Freedom Circle
Jul 17, 2025 · Databases

What Happens Under the Hood When a Redis Command Executes? – A Deep Dive into Redis’s Reactor Model

This article explains the three‑stage execution flow of a Redis command—connection establishment, command processing, and result return—detailing how the single‑threaded reactor pattern drives event handling, how commands are parsed and dispatched, and how the output is sent back, with code snippets and a comparison to Netty’s multithreaded reactor.

Command ExecutionDatabase InternalsEvent Loop
0 likes · 50 min read
What Happens Under the Hood When a Redis Command Executes? – A Deep Dive into Redis’s Reactor Model
Tech Freedom Circle
Tech Freedom Circle
Jul 17, 2025 · Artificial Intelligence

DeepSeek V3 Architecture Deep Dive: MoE, MLA, DualPipe, FP8 Mixed Precision & Multi‑Token Prediction

This article provides a detailed technical analysis of DeepSeek‑V3, covering its MOE architecture, the novel Multi‑head Latent Attention (MLA) mechanism, the DualPipe pipeline‑parallel algorithm, mixed‑precision FP8 training, and the Multi‑Token Prediction (MTP) inference improvements that together boost performance and efficiency.

DeepSeekDistributed TrainingDualPipe
0 likes · 44 min read
DeepSeek V3 Architecture Deep Dive: MoE, MLA, DualPipe, FP8 Mixed Precision & Multi‑Token Prediction
Tech Freedom Circle
Tech Freedom Circle
Jul 16, 2025 · Interview Experience

How to Use and Optimize State Machines in Java for Interview Success

This article explains the concept of state machines, why traditional if‑else logic is problematic, compares popular Java state‑machine frameworks, provides performance benchmarks, walks through a complete Spring Statemachine implementation for order processing, and offers practical optimization and monitoring tips for high‑throughput scenarios.

JavaOptimizationPerformance
0 likes · 30 min read
How to Use and Optimize State Machines in Java for Interview Success