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Xiao Lou's Tech Notes

Backend technology sharing, architecture design, performance optimization, source code reading, troubleshooting, and pitfall practices

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Latest from Xiao Lou's Tech Notes

79 recent articles

Xiao Lou's Tech Notes

Mar 22, 2022 · Backend Development

Boosting a Dubbo Registry from 40 to 1100 QPS: Practical Performance Hacks

Through systematic measurement, bottleneck identification, and targeted optimizations—including lock redesign, Redis caching, and URL parsing improvements—the author transformed a Go‑based Dubbo registry’s registration throughput from 40 QPS to over 1100 QPS, demonstrating practical performance‑tuning techniques for high‑scale backend services.

Gobackendprofiling

0 likes · 12 min read

Boosting a Dubbo Registry from 40 to 1100 QPS: Practical Performance Hacks

Xiao Lou's Tech Notes

Mar 7, 2022 · Backend Development

Why My First Go PR Failed and What I Learned About Testing and Commit Messages

The author recounts a failed Go pull‑request, detailing overflow bugs, missing tests, improper commit messages, and how proper code review practices can turn a buggy contribution into a successful merge.

GoPull Requestbenchmark

0 likes · 9 min read

Why My First Go PR Failed and What I Learned About Testing and Commit Messages

Xiao Lou's Tech Notes

Feb 14, 2022 · Backend Development

What’s New in Alibaba’s Java Development Manual? 11 Updated Rules Explained

This article reviews Alibaba’s Java Development Manual, highlights the latest Huangshan edition’s 11 new coding and design rules—including enum immutability, NPE‑prone ternary usage, security checks, and database practices—while providing concrete code examples and practical insights for Java engineers.

EnumJavaNPE

0 likes · 7 min read

What’s New in Alibaba’s Java Development Manual? 11 Updated Rules Explained

Xiao Lou's Tech Notes

Jan 26, 2022 · Databases

Unlocking Redis: How the RESP Protocol Powers Lightning‑Fast Data Access

This article explains Redis's high‑performance RESP protocol, its simple design principles, how commands are serialized over TCP, and demonstrates Java examples for both a mock server and client, while detailing the various response types defined by the protocol.

JavaNetworkProtocol

0 likes · 9 min read

Unlocking Redis: How the RESP Protocol Powers Lightning‑Fast Data Access

Xiao Lou's Tech Notes

Jan 13, 2022 · Operations

Detecting and Recovering Unhealthy Nodes in Microservice Architectures

This article explores various service health‑checking techniques in microservice environments, detailing how consumers, providers, and registration centers can identify unhealthy nodes through passive and active checks, heartbeat mechanisms, TCP connection monitoring, and registration‑center probing, while weighing trade‑offs in reliability, timeliness, and resource consumption.

Heartbeatnode monitoringservice discovery

0 likes · 11 min read

Detecting and Recovering Unhealthy Nodes in Microservice Architectures

Xiao Lou's Tech Notes

Dec 30, 2021 · Backend Development

Why Rewrite Dubbo in Go? Exploring the Business and Technical Drivers

This article examines the motivations behind rewriting the popular Java RPC framework Dubbo in Go, discussing language efficiency, micro‑service architecture, RPC competition, thread‑pool challenges, and the emerging role of Dubbo‑Go in service‑mesh environments.

Gobackendservice mesh

0 likes · 9 min read

Why Rewrite Dubbo in Go? Exploring the Business and Technical Drivers

Xiao Lou's Tech Notes

Dec 24, 2021 · Backend Development

Switching to Middleware Development: Is It Too Late? A Veteran’s Guide

After years of working in middleware teams at both startups and Alibaba Cloud, the author shares insights on what middleware development entails, the differences from business development, essential skills, typical roles, and practical steps for engineers aspiring to transition into this specialized backend field.

Middlewarecareer advice

0 likes · 11 min read

Switching to Middleware Development: Is It Too Late? A Veteran’s Guide

Xiao Lou's Tech Notes

Dec 20, 2021 · Backend Development

Mastering Sliding Window Rate Limiting in Sentinel-Go: From Theory to Code

This article explores why engineering skills outrank pure algorithm knowledge, explains the challenges of implementing flow‑control algorithms such as token bucket and sliding‑window rate limiting, and walks through Sentinel‑Go's concrete LeapArray implementation with detailed Go code examples.

Rate LimitingSentinel GoSliding Window

0 likes · 11 min read

Mastering Sliding Window Rate Limiting in Sentinel-Go: From Theory to Code

Xiao Lou's Tech Notes

Dec 16, 2021 · Backend Development

From Druid to MetaQ: A Developer’s Journey Through Middleware Mastery

This article chronicles a developer’s personal and technical evolution—from refactoring a lottery service with Druid, exploring Cobar sharding, diving deep into MetaQ’s messaging model, to designing custom task‑scheduling systems—highlighting lessons learned, architectural insights, and the enduring value of connecting the dots in software engineering.

Message QueueMiddlewarebackend

0 likes · 16 min read

From Druid to MetaQ: A Developer’s Journey Through Middleware Mastery

Xiao Lou's Tech Notes

Nov 21, 2021 · Backend Development

How I Reduced Dubbo Registry CPU Usage by 20× with Go URL Parsing Optimizations

This article details how a Go‑based Dubbo registration center suffered high CPU usage, how profiling identified the AssembleUrlWeight function as the bottleneck, and how custom URL‑parameter extraction and weight‑insertion code cut CPU consumption by over ten percent and improved performance by up to twenty times.

DubboPerformance optimizationURL parsing

0 likes · 12 min read

How I Reduced Dubbo Registry CPU Usage by 20× with Go URL Parsing Optimizations