ZCY Technology Team (Zero), based in Hangzhou, is a growth-oriented team passionate about technology and craftsmanship. With around 500 members, we are building comprehensive engineering, project management, and talent development systems. We are committed to innovation and creating a cloud service ecosystem for government and enterprise procurement. We look forward to your joining us.
This article presents a detailed design and implementation plan for adding configurable noise‑reduction to both traffic recording and result comparison in Alibaba's jvm‑sandbox‑repeater, including new configuration fields, comparator extensions, and a Quartz‑based denoising job with Akka integration.
This article explains core concepts and practical solutions for handling massive datasets that cannot fit into memory, covering batch processing, distributed sorting, bitmap indexing, hash‑based lookups, top‑K extraction, and deduplication techniques with code examples and multi‑machine strategies.
This article explains the concept of semantic versioning, clarifies the meaning of pre‑release identifiers such as alpha, beta, rc and release with intuitive analogies, details the major‑minor‑patch rules, compares version syntax across major package managers, and provides practical validation tools and examples.
This article explains the concept of threads in Java, how to create them, the purpose and benefits of thread pools, the inheritance hierarchy of Java's Executor framework, key parameters of ThreadPoolExecutor, rejection policies, pool states, and the underlying working mechanism, supplemented with code examples.
This article explains the Netty EventLoop implementation, covering its reactor‑based event loop design, event handling and task processing mechanisms, code examples, common pitfalls such as the JDK epoll bug, and practical recommendations for building high‑performance backend services.
This article explains how Netty implements memory management by borrowing concepts from Jemalloc and Tcmalloc, detailing the hierarchy of arenas, chunks, pages and sub‑pages, the allocation algorithms for both large and small buffers, and the role of thread‑local caches in reducing fragmentation and improving performance.
This article explains the concept of threads in computer science, demonstrates how Java encapsulates threads with the Thread class, shows basic and multithreaded examples, introduces thread pools and their management, and details the new virtual thread model introduced by Project Loom for high‑throughput, low‑overhead concurrency.
This article provides a comprehensive overview of Seata, a distributed transaction framework that ensures data consistency across microservices through four transaction modes: AT, XA, TCC, and Saga, each with distinct characteristics and use cases.
ThreadLocal provides each Java thread with its own isolated variable copy, and this article explains its underlying mechanism, core methods (set, get, remove), internal ThreadLocalMap structure, practical code examples, common usage scenarios, and important considerations such as memory leaks and proper cleanup.
This article introduces front‑end graph visualization using AntV G6 and Graphin, explains graph models and JSON data structures, covers traversal, shortest‑path and clustering algorithms, compares G6 and Graphin, and provides detailed TypeScript and React code for custom extensions, event handling, and full‑screen support.
