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 explains the historic C10K problem of handling ten thousand concurrent connections, compares traditional BIO with modern I/O models such as NIO, select, poll, epoll, and AIO, and provides Java and C++ code examples illustrating how each model improves scalability and performance.
This article explains RocketMQ's core components, the differences between push and pull consumption modes, and how the framework implements a pseudo‑push mechanism using long polling, including detailed code analysis of the consumer and broker side processes.
This article provides a comprehensive technical analysis of how MySQL processes ORDER BY and LIMIT clauses during pagination queries, detailing index utilization, filesort mechanisms, memory-based sorting algorithms, and practical optimization strategies for resolving deep pagination performance bottlenecks.
This article investigates why Sharding-JDBC takes over half of the application startup time to load metadata, explains the role of the max.connections.size.per.query setting, demonstrates how adjusting it speeds up startup, and discusses the trade‑offs and potential dead‑lock risks of increasing the value.
The article reports on Zhengcai Cloud's successful migration to Dubbo3.1.8, detailing the motivations, scale of the system, upgrade process, and the resulting performance and stability improvements for its massive procurement platform.
This article describes a unified, configurable data‑permission framework built on RBAC, detailing its architecture, rule definition, integration workflow, Java SDK implementation, and practical examples to achieve flexible, low‑coupling access control across multiple backend systems.
This article explains Spring Boot's auto‑configuration mechanism, covering how @EnableAutoConfiguration loads configuration classes, the role of @AutoConfigurationPackage and @Import, the processing of spring.factories and metadata files, and how the main application class is registered in the IoC container.
This article explains what threads are, how Java maps its threads to operating‑system thread models (1:1, N:1, N:M), the differences between kernel and user threads, thread scheduling, context switching, priority handling, and includes sample Java code to compare serial and multithreaded execution.
This guide walks through building a 3D digital human using Unreal Engine’s MetaHuman Creator, driving it with live facial capture from an iPhone, and applying AI‑based face swapping (roop) to replace the character’s face with Mr. Bean, covering all required tools, setup, and export steps.
This article provides a comprehensive overview of Redis memory management, detailing how maxmemory limits trigger various eviction policies, explaining the internal freeMemoryIfNeeded algorithm, and describing expiration mechanisms—including active and lazy deletion—and offering guidance on selecting the appropriate eviction strategy for different workloads.
