Passionate about technology, though not great at solving problems; eager to share, never tire of learning!
This article walks through a real‑world NPE caused by Lombok’s @Builder ignoring field initializers, explains the underlying double‑initialisation bug, shows how @Builder.Default restores the defaults, and outlines Lombok’s compile‑time annotation processing mechanism.
This comprehensive guide explains why MySQL needs InnoDB locking, details the seven lock types, shows how a single SQL statement acquires locks under different isolation levels, demonstrates how to view lock information, and walks through practical deadlock analysis examples.
This article examines practical strategies for automatically canceling unpaid orders, comparing simple timer‑based polling, cluster‑ready schedulers like Quartz, Elastic‑Job, and XXL‑JOB, as well as delayed‑message approaches using RocketMQ and Redis, and offers best‑practice guidelines for concurrency, monitoring, and fault tolerance.
This article breaks down the ten key mechanisms—batch sending, message compression, Netty‑based networking, zero‑copy I/O, sequential writes, optimized storage structures, asynchronous flushing and replication, batch processing, lock refinements, and thread‑pool isolation—that together give RocketMQ its remarkable speed and efficiency.
This article explores why rate limiting is essential for high‑concurrency services, introduces four core algorithms with Go implementations, compares their strengths and weaknesses, and presents practical distributed limiting strategies using Redis, load balancers, and coordination services.
This comprehensive guide presents a systematic, step‑by‑step process for diagnosing JVM memory problems—including heap, Metaspace, DirectMemory, JNI memory, and stack issues—using Alibaba Cloud ARMS, ATP, standard JDK tools, and best‑practice commands to quickly locate root causes and apply effective solutions.
This article presents a comprehensive guide for backend developers, covering ten practical techniques—including local and distributed caching, parallel execution, asynchronous processing, connection pooling, sharding, SQL tuning, pre‑computation, batch operations, lock granularity, and context propagation—to dramatically improve API performance.
This article introduces the five most common encryption algorithms—MD5, SHA‑256, DES, AES, and RSA—explaining their classifications, security properties, typical use cases, and providing complete Java implementations for each, while also showing how they underpin HTTPS security.
This article traces the two‑decade evolution of message queues—from early decoupling solutions like ActiveMQ, through high‑throughput designs such as Kafka, to modern platformized systems like RocketMQ and Pulsar—while explaining fundamental concepts, partitioning, and storage architectures that underpin today’s distributed messaging platforms.
This article explains the Raft consensus algorithm, its request lifecycle, leader election, snapshot mechanism, and JRaft optimizations such as linear reads, learners, and multi‑raft groups, illustrating how Nacos integrates these concepts to achieve reliable distributed consistency.
