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Cognitive Technology Team
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Cognitive Technology Team

Cognitive Technology Team regularly delivers the latest IT news, original content, programming tutorials and experience sharing, with daily perks awaiting you.

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Recent Articles

Latest from Cognitive Technology Team

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Cognitive Technology Team
Cognitive Technology Team
Aug 25, 2025 · Backend Development

Why epoll Uses Red-Black Trees for High-Performance Linux Networking

epoll, Linux’s high-performance I/O multiplexing mechanism, outperforms select and poll by leveraging a red-black tree to manage file descriptors, offering O(log n) registration, O(1) event retrieval, and scalable handling of millions of connections, with detailed explanations of its architecture, workflow, and performance advantages.

High ConcurrencyI/O MultiplexingLinux
0 likes · 10 min read
Why epoll Uses Red-Black Trees for High-Performance Linux Networking
Cognitive Technology Team
Cognitive Technology Team
Aug 24, 2025 · Information Security

How DoS Attacks Work and How to Defend Against Them

This article explains what denial‑of‑service (DoS) attacks are, describes their underlying principles and common variants such as SYN, UDP, ICMP, and HTTP floods, and outlines comprehensive defense strategies including firewalls, IDS, CDN, multi‑active architectures, SYN cookies, rate limiting, and cloud‑based protection services.

DDoSDOSDefense Strategies
0 likes · 9 min read
How DoS Attacks Work and How to Defend Against Them
Cognitive Technology Team
Cognitive Technology Team
Aug 24, 2025 · Fundamentals

Why TCP’s Three‑Way Handshake and Four‑Way Teardown Matter for Reliable Networks

Understanding TCP’s three‑way handshake and four‑way termination reveals how reliable connections are established and gracefully closed, highlighting the protocol’s core mechanisms—sequence numbers, acknowledgments, flow control, and TIME‑WAIT—while also addressing performance considerations, optimization techniques, and the future impact of emerging protocols like QUIC.

HandshakeNetworkingProtocol
0 likes · 12 min read
Why TCP’s Three‑Way Handshake and Four‑Way Teardown Matter for Reliable Networks
Cognitive Technology Team
Cognitive Technology Team
Aug 24, 2025 · Databases

When Auto‑Increment IDs Exhaust: Risks and Scalable Solutions for MySQL & PostgreSQL

This article examines how auto‑increment primary keys work, the limits of common integer types, the failures that occur when those limits are reached, and practical strategies—including type upgrades, distributed ID generators, sharding, and sequence cycling—to prevent and mitigate ID exhaustion in high‑traffic MySQL and PostgreSQL deployments.

Distributed IDMySQLPostgreSQL
0 likes · 9 min read
When Auto‑Increment IDs Exhaust: Risks and Scalable Solutions for MySQL & PostgreSQL
Cognitive Technology Team
Cognitive Technology Team
Aug 22, 2025 · Backend Development

Unlock MyBatis-Plus: From Zero-Code CRUD to Advanced Plugins

This article introduces MyBatis-Plus as a zero‑intrusion enhancement to MyBatis, explains its core values of convenience, safety, and compatibility, details CRUD methods, condition builders, plugin mechanisms, and best‑practice guidelines for building efficient, secure backend services.

CRUDJavaLambda Query
0 likes · 15 min read
Unlock MyBatis-Plus: From Zero-Code CRUD to Advanced Plugins
Cognitive Technology Team
Cognitive Technology Team
Aug 22, 2025 · Backend Development

Unlocking Ordered Messaging: How RocketMQ and DDMQ Ensure Sequence

This article deeply explores the sequential consumption mechanisms of RocketMQ and its derivative DDMQ, comparing their source‑code implementations, detailing producer ordering, broker locking, consumer locking, and the architectural differences that allow DDMQ to achieve ordered processing with only proxy‑side locks.

DDMQJavaOrdered Consumption
0 likes · 30 min read
Unlocking Ordered Messaging: How RocketMQ and DDMQ Ensure Sequence
Cognitive Technology Team
Cognitive Technology Team
Aug 19, 2025 · Operations

How Bilibili Scaled Server Fault Management with Automated Detection and Repair

This article details Bilibili's evolving server fault management architecture, covering fault classification, the shortcomings of manual processes, and the design of an automated detection and repair system that combines in‑band and out‑of‑band data collection, rule‑based alerts, and end‑to‑end repair automation.

Monitoringin‑band collectionoperations
0 likes · 18 min read
How Bilibili Scaled Server Fault Management with Automated Detection and Repair
Cognitive Technology Team
Cognitive Technology Team
Aug 17, 2025 · Backend Development

synchronized vs Lock in Java: When to Choose Each for Thread Safety

This article examines the core differences between Java's synchronized keyword and the Lock interface, covering their principles, performance, flexibility, visibility guarantees, reentrancy, interruption handling, and practical selection guidelines with code examples, tables, and real‑world scenarios to help developers choose the appropriate locking mechanism.

JavaLockPerformance
0 likes · 9 min read
synchronized vs Lock in Java: When to Choose Each for Thread Safety