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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
Sep 19, 2025 · Interview Experience

Designing a Rock‑Solid High‑Availability Solution for Unreliable Third‑Party Services

When third‑party services frequently fail, this article walks through a systematic high‑availability design—including an ACL anti‑corruption layer, strategy‑pattern master‑slave routing, precise rate limiting, circuit‑breaker fallback, full observability, async degradation, and mock testing—to keep external dependencies as stable as a mountain.

ACLCircuit BreakerHigh Availability
0 likes · 24 min read
Designing a Rock‑Solid High‑Availability Solution for Unreliable Third‑Party Services
Tech Freedom Circle
Tech Freedom Circle
Sep 18, 2025 · Backend Development

Master Spring Cloud Internals (Nacos, Sentinel, Load Balancing) to Ace Interviews and Land Offers

This article provides a systematic deep‑dive into Spring Cloud’s load‑balancing layers, Sentinel’s flow‑control mechanisms, Nacos’s AP/CP dual model, configuration‑file priority rules, and service‑offline handling, offering concrete examples and best‑practice recommendations for interview preparation.

Circuit BreakingConfiguration ManagementNacos
0 likes · 34 min read
Master Spring Cloud Internals (Nacos, Sentinel, Load Balancing) to Ace Interviews and Land Offers
Tech Freedom Circle
Tech Freedom Circle
Sep 16, 2025 · Backend Development

Redis Fuzzy Search Techniques and the Most Dangerous Commands to Avoid

The article explains how to perform fuzzy queries in Redis using KEYS, SCAN, and collection‑type scans, enumerates commands that can block the single‑threaded server such as KEYS *, HGETALL, LRANGE, and provides practical mitigation strategies like incremental scans, key sharding, and asynchronous deletion.

BlockingRedisSCAN
0 likes · 24 min read
Redis Fuzzy Search Techniques and the Most Dangerous Commands to Avoid
Tech Freedom Circle
Tech Freedom Circle
Sep 11, 2025 · Backend Development

How to Optimize a Redis Big Key Online Without Disrupting Existing Services (Interview Answer)

The article explains what a Redis big key is, why it harms performance, typical scenarios that generate big keys, and provides a step‑by‑step online optimization plan—including key sharding, dual‑write synchronization, progressive migration with HSCAN, gray‑scale traffic switch, non‑blocking deletion using UNLINK, and monitoring with rollback procedures—to answer the interview question confidently.

BackendBig KeyData Migration
0 likes · 16 min read
How to Optimize a Redis Big Key Online Without Disrupting Existing Services (Interview Answer)
Tech Freedom Circle
Tech Freedom Circle
Sep 5, 2025 · Interview Experience

How to Diagnose Frequent Full GC in Java Interviews

This article explains the root‑cause analysis and step‑by‑step troubleshooting process for frequent Full GC events in Java applications, covering trigger mechanisms, impact assessment, common causes, monitoring tools, heap‑dump analysis, and both short‑term fixes and long‑term architectural improvements.

Full GCJavainterview
0 likes · 47 min read
How to Diagnose Frequent Full GC in Java Interviews
Tech Freedom Circle
Tech Freedom Circle
Sep 4, 2025 · Backend Development

How to Solve ES Latency in MySQL‑Canal Sync and Indexing Scenarios?

The article dissects the interview question about ES latency in a MySQL‑Canal‑to‑Elasticsearch pipeline, explains the root causes across four system layers, and presents a comprehensive four‑layer optimization, end‑to‑end observability, routing‑based degradation, and a Java‑based LatencyProbe component to measure and control delay.

CanalElasticSearchKafka
0 likes · 17 min read
How to Solve ES Latency in MySQL‑Canal Sync and Indexing Scenarios?
Tech Freedom Circle
Tech Freedom Circle
Sep 2, 2025 · Databases

Avoid Redis Blocking: Dangerous Commands and How to Prevent Outages

In Redis's single‑threaded model, commands with O(n) or higher complexity—such as KEYS, HGETALL, LRANGE, SMEMBERS, and DEL on large keys—can block the server during traffic spikes, but using incremental scans, key splitting, and async deletion can eliminate the risk and keep services responsive.

BlockingCommand OptimizationDatabase Performance
0 likes · 23 min read
Avoid Redis Blocking: Dangerous Commands and How to Prevent Outages
Tech Freedom Circle
Tech Freedom Circle
Sep 1, 2025 · Databases

How ClickHouse Executes GROUP BY and Handles Real‑Time Analytics on Billions of Rows

This article explains ClickHouse’s core architecture—including its storage‑compute integration, MPP parallelism, columnar storage, vectorized execution, data pre‑sorting, table engines, sparse and auxiliary indexes, and the two‑stage aggregation pipeline—then walks through the exact GROUP BY execution flow for both local and distributed tables, illustrating each step with diagrams, SQL demos, and code snippets.

ClickHouseColumnar StorageDistributed Query
0 likes · 29 min read
How ClickHouse Executes GROUP BY and Handles Real‑Time Analytics on Billions of Rows
Tech Freedom Circle
Tech Freedom Circle
Aug 29, 2025 · Backend Development

What Is SSE? Why Is This 20‑Year‑Old Technology Suddenly Booming? – Interview Deep Dive

This article provides a comprehensive interview‑style analysis of Server‑Sent Events (SSE), covering its definition, 20‑year history, core features, data format, Java Spring Boot implementation, client‑side EventSource usage, detailed comparison with WebSocket and other polling techniques, and a decision guide for choosing the right real‑time communication protocol in modern AI‑driven applications.

AIJavaSSE
0 likes · 47 min read
What Is SSE? Why Is This 20‑Year‑Old Technology Suddenly Booming? – Interview Deep Dive