Backend technology sharing, architecture design, performance optimization, source code reading, troubleshooting, and pitfall practices
A recent Go article sparked a lively poll and discussion about the reasonableness of Go's read‑write lock design, revealing surprising community opinions, common misconceptions, and deeper questions about reentrant locks, communication versus sharing, and Go's concurrency philosophy.
This article explores the fundamentals of CPU cache hierarchy, why caches are needed, how cache inconsistency arises in multicore systems, and the mechanisms—such as cache coherence protocols, MESI, store buffers, invalidate queues, and memory barriers—that ensure correct data ordering and visibility across processors.
An in‑depth analysis of a deadlock caused by Go’s sync.RWMutex in a microservice, comparing its non‑reentrant read‑write lock behavior with Java’s ReentrantReadWriteLock, illustrating the root cause, code examples, and design rationale behind Go’s lock implementation.
This article walks through Dubbo’s RPC communication using a packet‑as‑narrator metaphor, detailing the thread models of Netty 3 and Netty 4, OS socket handling, and practical troubleshooting steps for latency and timeout issues in a clear, engaging style.
This article explores how naive timestamp retrieval can become a CPU bottleneck under high concurrency, demonstrates cache‑based optimizations used in Alibaba's Cobar and Sentinel projects, presents benchmark results, and proposes an adaptive algorithm to enable or disable caching based on real‑time QPS.
A developer chronicles a perplexing Fastjson bug where identical JSON data intermittently triggers a 'can not cast to String' error, explains how generic type caching caused the issue, and shows how upgrading from version 1.2.29 to 1.2.33 resolves it.
An in‑depth look at a real‑world file‑watching failure caused by a JDK timestamp bug, exploring Java’s WatchService implementation, its reliance on polling versus Linux’s inotify, and practical workarounds to ensure reliable configuration reloads across platforms.
This article chronicles the step‑by‑step evolution of a ride‑hailing order service, detailing how a single SQLServer database was optimized, split by business domain, migrated to MySQL, and finally sharded with a custom client‑side component, while leveraging read/write separation, caching, MQ, and data‑exchange platforms to sustain massive traffic.
This article examines whether Go can achieve aspect‑oriented programming by comparing Java's AOP mechanisms, introducing the gohook library for runtime method interception, and demonstrating how to modify Go source code through AST transformations with concrete code examples.
The author recounts a decade‑long journey of reading open‑source Java frameworks—from Tomcat and Spring to Netty, Dubbo, and the Linux kernel—highlighting how systematic shortcut practice, debugging techniques, and focused inquiry transformed his development skills and offers guidance for others seeking a similar path.
