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Programmer XiaoFu
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Programmer XiaoFu

xiaofucode.com – a programmer learning guide driven by the pursuit of profit

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Recent Articles

Latest from Programmer XiaoFu

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Programmer XiaoFu
Programmer XiaoFu
Oct 16, 2025 · Operations

Stop Guessing: Kafka Message Backlog, Duplicates, and Loss Are Usually Caused by Rebalance

Kafka consumer issues such as message backlog, duplicate processing, and data loss often stem from consumer group rebalances triggered by changes in consumer count, partition count, subscription topics, or heartbeat and poll timeouts, and can be mitigated by tuning timeout settings, managing offset commits, and using sticky partition assignment.

Consumer GroupKafkaMessage Duplication
0 likes · 13 min read
Stop Guessing: Kafka Message Backlog, Duplicates, and Loss Are Usually Caused by Rebalance
Programmer XiaoFu
Programmer XiaoFu
Oct 15, 2025 · R&D Management

Why GitButler’s Modern Visual Git Management Boosts Developer Productivity

GitButler introduces virtual branches that let developers work on multiple features simultaneously without switching physical branches, offering parallel development, smart change attribution, real-time conflict detection, AI-assisted commit generation, drag-and-drop commit management, seamless conversion to real branches, deep GitHub integration, and workflow optimizations for faster bug fixes and exploratory coding.

AI-assisted commitsDeveloper workflowGit
0 likes · 5 min read
Why GitButler’s Modern Visual Git Management Boosts Developer Productivity
Programmer XiaoFu
Programmer XiaoFu
Oct 11, 2025 · Backend Development

How a Single Nacos Setting Crashed Our Payment Service—and What It Teaches About Instance Types

A mis‑configured Nacos registration flag turned a payment service into a persistent instance, preventing unhealthy nodes from being removed and causing the entire payment chain to fail; the article explains the fundamental differences between registration and configuration centers and when to use temporary versus persistent instances.

Configuration ManagementEphemeral InstanceNacos
0 likes · 7 min read
How a Single Nacos Setting Crashed Our Payment Service—and What It Teaches About Instance Types
Programmer XiaoFu
Programmer XiaoFu
Sep 25, 2025 · Databases

Redis LRU vs Classic LRU: Differences, LFU Comparison, and How to Choose

Redis implements an approximate LRU using random sampling and timestamps, while classic LRU relies on exact access order; the article explains both LRU and LFU fundamentals, their Java implementations, Redis-specific variants, trade‑offs, use‑case recommendations, and configuration tips for selecting the optimal eviction policy.

Cache EvictionJavaLFU
0 likes · 21 min read
Redis LRU vs Classic LRU: Differences, LFU Comparison, and How to Choose
Programmer XiaoFu
Programmer XiaoFu
Sep 15, 2025 · Information Security

SSO vs OAuth2.0: Key Differences Explained for Interviews

This article compares Single Sign‑On (SSO) and OAuth2.0, detailing their conceptual distinctions, token‑based workflows, implementation frameworks like CAS, the four OAuth2.0 grant types, and how each can be used to achieve seamless authentication across applications.

AuthenticationAuthorizationCAS
0 likes · 8 min read
SSO vs OAuth2.0: Key Differences Explained for Interviews
Programmer XiaoFu
Programmer XiaoFu
Sep 8, 2025 · Backend Development

Why My Spring Cloud Gateway Returns 404 After Nacos Config Changes – A Year-Long Debugging Tale

The article walks through a year‑long investigation of a 404 error that appears after updating Nacos dynamic routing in Spring Cloud Gateway 3.0.1, explains how stale weight caches cause the failure, and presents a custom event‑listener solution that synchronizes the gateway's weight cache with the latest Nacos configuration.

404JavaNacos
0 likes · 12 min read
Why My Spring Cloud Gateway Returns 404 After Nacos Config Changes – A Year-Long Debugging Tale
Programmer XiaoFu
Programmer XiaoFu
Sep 4, 2025 · Databases

How to Add a Column to a Ten‑Million‑Row MySQL Table Without Locking It

When a core MySQL order table reaches tens of millions of rows, adding a new column can lock the table and disrupt services, so the article walks through master‑slave switching, online DDL tools, log‑based workarounds, extension tables, JSON fields, and a final redundant‑field trick to achieve the change safely.

DDL lockJSON columnMySQL
0 likes · 7 min read
How to Add a Column to a Ten‑Million‑Row MySQL Table Without Locking It
Programmer XiaoFu
Programmer XiaoFu
Sep 1, 2025 · Fundamentals

Advanced Chain of Responsibility: Multi‑Level Validation and Workflow for Elegant Code

This article explains the Chain of Responsibility pattern, shows how to use it for multi‑stage validation and workflow scenarios, walks through a product‑creation example with concrete handlers, configuration via JSON, Spring bean injection, recursive chain assembly, and a reimbursement‑approval workflow, complete with runnable test cases.

Chain of ResponsibilityDesign PatternsJava
0 likes · 20 min read
Advanced Chain of Responsibility: Multi‑Level Validation and Workflow for Elegant Code
Programmer XiaoFu
Programmer XiaoFu
Aug 12, 2025 · Backend Development

Deep Dive into an Asynchronous Spring Boot + Tesseract OCR Pipeline for Invoice Recognition

This article presents a comprehensive, step‑by‑step analysis of a high‑throughput, asynchronous OCR pipeline built with Spring Boot and Tesseract, covering system architecture, thread‑pool tuning, custom invoice‑specific model training, multi‑engine fusion, structured data extraction, performance optimizations, GPU acceleration, Kubernetes deployment, monitoring, security compliance, chaos testing, and future evolution plans.

KubernetesOCRPrometheus
0 likes · 12 min read
Deep Dive into an Asynchronous Spring Boot + Tesseract OCR Pipeline for Invoice Recognition