A public account focused on workplace, career growth, team management, and self-improvement. The author is the writer of books including 'SpringBoot Technology Insider' and 'Drools 8 Rule Engine: Core Technology and Practice'.
This article explains Java's five thread‑safety categories—from immutable to thread‑hostile—and details practical ways to achieve safety, including mutex synchronization, non‑blocking CAS techniques, and no‑sync approaches such as re‑entrant code and thread‑local storage.
This article explains why single‑node Redis suffers from single‑point failures, describes the master‑slave replication model, details the Sentinel automatic failover mechanism, compares various sharding solutions like client‑side sharding, Twemproxy, Codis, and outlines the features and deployment considerations of Redis Cluster.
This article introduces nginxconfig.io, an open‑source visual tool that simplifies Nginx configuration by letting you select site presets, services, HTTPS, logging, limits and global performance options, then instantly generates ready‑to‑use config files for faster deployment.
This article explains the fundamentals of Compare‑And‑Swap (CAS), its implementation in Java through the Unsafe class, demonstrates AtomicInteger's lock‑free operations, and discusses CAS drawbacks such as spin‑wait overhead, single‑variable limitation, and the ABA problem with mitigation strategies.
This article details the step‑by‑step evolution of ZuanZuan's C2B recycling price‑increase coupon architecture, covering early experimentation, platformization, table sharding, intelligent recommendation, Elasticsearch integration, and stability enhancements to handle massive traffic and data growth.
This article explains why floating‑point types cause precision errors in financial calculations, reveals four common BigDecimal pitfalls—including constructor misuse, equality comparison, division precision, and string conversion—and provides concrete best‑practice solutions such as using String constructors, compareTo, specifying scale, and appropriate formatting methods.
This article explains the three critical cache failure scenarios—cache penetration, cache avalanche, and cache breakdown—detailing their causes, real‑world impacts on high‑concurrency systems, and practical mitigation techniques using Redis and general backend strategies.
This article explains ZGC’s evolution from an experimental feature in JDK 11 to a production‑ready collector in JDK 15, detailing its sub‑10 ms pause guarantee, memory‑mapping architecture, colored pointers, region layout, read barriers, and the multi‑phase concurrent collection process that together deliver low‑latency, high‑throughput garbage collection for Java applications.
This article explains why Java’s ArrayList uses a default initial capacity of 10, contrasts it with HashMap’s 16‑element default, and walks through the lazy‑initialization logic and growth algorithm that keep the capacity at ten until the first element is added.
This guide outlines detailed naming conventions for databases, tables, columns, indexes, views, stored procedures, functions, triggers, constraints, and users, plus best practices for storage engine, charset, table design, field types, index design, and SQL usage to ensure consistency, performance, and maintainability.
