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Xueersi Online School Tech Team

The Xueersi Online School Tech Team, dedicated to innovating and promoting internet education technology.

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Latest from Xueersi Online School Tech Team

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Xueersi Online School Tech Team

Apr 2, 2021 · Fundamentals

Introduction to Protobuf and Its Practical Application in Frontend and Backend Development

This article introduces Google Protocol Buffers, explains its binary encoding principles such as Tag‑Length‑Value, Varint and ZigZag, compares its efficiency with JSON/XML, and provides a step‑by‑step demo of building a Protobuf‑based WebSocket communication system using Node.js, protobufjs and a simple HTTP server.

Node.jsbinary protocoldata serialization

0 likes · 19 min read

Introduction to Protobuf and Its Practical Application in Frontend and Backend Development

Xueersi Online School Tech Team

Mar 26, 2021 · Fundamentals

Design Patterns and SOLID Principles for Building a Message Sending Service

This article explains how to apply classic design patterns and the six SOLID principles—Liskov Substitution, Single Responsibility, Dependency Inversion, Interface Segregation, Law of Demeter, and Open‑Closed—to design a maintainable, extensible message‑sending system with task scheduling and dynamic provider configuration.

Design PatternsPHPSOLID

0 likes · 17 min read

Design Patterns and SOLID Principles for Building a Message Sending Service

Xueersi Online School Tech Team

Mar 19, 2021 · Fundamentals

Understanding Python's Import System: Concepts, Mechanisms, and Best Practices

This article provides an in‑depth exploration of Python’s import system, covering basic concepts such as modules and packages, absolute and relative imports, the underlying C implementation, the role of importlib, finders and loaders, and practical guidelines for structuring imports in real projects.

Code LoadingImport SystemPEP

0 likes · 45 min read

Understanding Python's Import System: Concepts, Mechanisms, and Best Practices

Xueersi Online School Tech Team

Mar 12, 2021 · Operations

Evolution of Live Streaming Load Testing and Stability Assurance for an Online Education Platform

The article details how an online education provider progressively enhanced its live‑streaming performance testing framework—from rudimentary "stone age" checks to automated, data‑driven "information age" practices—by restructuring services, refining test scenarios, introducing traffic replay, and automating script generation to achieve more reliable and efficient stability assurance.

Automationload-testingonline education

0 likes · 12 min read

Evolution of Live Streaming Load Testing and Stability Assurance for an Online Education Platform

Xueersi Online School Tech Team

Mar 5, 2021 · Fundamentals

Evolution and Limitations of HTTP/1.1, HTTP/2, and HTTP/3 (QUIC)

This article reviews the evolution of HTTP from version 1.1 to HTTP/2 and HTTP/3, explaining key features such as persistent connections, pipelining, binary framing, header compression, multiplexing, and QUIC's advantages, while also highlighting the remaining drawbacks like head‑of‑line blocking, TCP connection limits, and security concerns.

QUICWeb Performancenetworking

0 likes · 16 min read

Evolution and Limitations of HTTP/1.1, HTTP/2, and HTTP/3 (QUIC)

Xueersi Online School Tech Team

Feb 26, 2021 · Backend Development

Understanding Golang v1.0 Coroutine Implementation: Creation, Switching, and Runtime Mechanics

This article explains the internal workings of Golang v1.0 coroutines, covering their creation, stack‑switching logic, scheduler design, virtual‑memory basics, assembly examples, channel handling, socket event loops, and the low‑level implementation of defer, panic, and recover.

AssemblyConcurrencyGoroutine

0 likes · 33 min read

Understanding Golang v1.0 Coroutine Implementation: Creation, Switching, and Runtime Mechanics

Xueersi Online School Tech Team

Jan 29, 2021 · Fundamentals

Understanding HttpDNS: Principles, Workflow, and Implementation in Xueersi Online School

This article introduces the shortcomings of traditional DNS, explains the HttpDNS concept and its underlying mechanisms, details the workflow and advantages of Alibaba Cloud HttpDNS, and describes how Xueersi Online School integrates HttpDNS across PC, Android, and iOS clients.

DNSDomain Name ResolutionHTTPDNS

0 likes · 14 min read

Understanding HttpDNS: Principles, Workflow, and Implementation in Xueersi Online School

Xueersi Online School Tech Team

Jan 22, 2021 · Backend Development

Debugging Service Discovery Failures in a Go RPCX Microservice Using Zookeeper

This article analyzes a microservice client’s connection‑timeout errors in a Kubernetes cluster, investigates Zookeeper‑based service discovery, uncovers one‑time watch semantics and a concurrency bug in rpcx’s channel handling, and presents a fix to ensure IP list updates.

ConcurrencyGoZooKeeper

0 likes · 14 min read

Debugging Service Discovery Failures in a Go RPCX Microservice Using Zookeeper

Xueersi Online School Tech Team

Jan 15, 2021 · Artificial Intelligence

Recommendation System Architecture and Engineering Overview

This article presents a comprehensive overview of a recommendation system, covering its business background, purpose, detailed engineering architecture—including data sources, computation, storage, online learning, service and access layers—and discusses key challenges, module design, and practical reflections.

AB testingData EngineeringMachine Learning

0 likes · 14 min read

Recommendation System Architecture and Engineering Overview

Xueersi Online School Tech Team

Jan 8, 2021 · Artificial Intelligence

Design and Implementation of a Rule‑Based and Collaborative‑Filtering Recommendation System for an Educational App

This article describes the business background, cold‑start challenges, rule‑based recall pipeline, Wilson interval and time‑decay scoring methods, item‑based collaborative filtering implementation with code, and experimental results that improved click‑through rates for the 学而思网校 educational application.

A/B-testWilson-intervalcold-start

0 likes · 12 min read

Design and Implementation of a Rule‑Based and Collaborative‑Filtering Recommendation System for an Educational App