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21CTO
21CTO
Mar 3, 2016 · Backend Development

Choosing the Right Load Balancing for Microservices: Centralized, In‑Process, Independent

The article explains three primary load‑balancing and service‑discovery patterns for microservice architectures—centralized external load balancers, client‑side soft load balancing, and independent host‑level LB processes—detailing their mechanisms, advantages, drawbacks, and real‑world examples such as F5/HAProxy, Netflix Eureka/Ribbon, and Airbnb SmartStack.

Backend ArchitectureDistributed SystemsMicroservices
0 likes · 5 min read
Choosing the Right Load Balancing for Microservices: Centralized, In‑Process, Independent
Java High-Performance Architecture
Java High-Performance Architecture
Mar 2, 2016 · Backend Development

Centralized, In‑Process, or Independent: Which Microservice Load‑Balancing Works Best?

The article explains three primary load‑balancing and service‑discovery patterns for microservice architectures—centralized external load balancers, client‑side soft load balancing, and independent LB processes—detailing their mechanisms, advantages, drawbacks, and real‑world examples such as Netflix Eureka, Dubbo, and Airbnb SmartStack.

Backend ArchitectureCloud NativeMicroservices
0 likes · 6 min read
Centralized, In‑Process, or Independent: Which Microservice Load‑Balancing Works Best?
21CTO
21CTO
Feb 16, 2016 · Backend Development

Rethinking 12306 Ticketing: A Domain‑Driven Design Model for Complex Train Reservations

This article analyses the unique business complexity of China's 12306 railway ticketing system, proposes a domain‑driven aggregate design centered on the train route, explains how to model seat availability and ticket issuance, and outlines a CQRS/event‑sourcing architecture to achieve strong consistency and high concurrency.

Backend ArchitectureCQRSDDD
0 likes · 25 min read
Rethinking 12306 Ticketing: A Domain‑Driven Design Model for Complex Train Reservations
Java High-Performance Architecture
Java High-Performance Architecture
Feb 14, 2016 · Backend Development

Why Distributed Message Queues Are Essential for Scalable Systems

The article explains the core concepts of message queues and distributed systems, describes how queues act as intermediaries to decouple producers and consumers, outlines benefits such as faster response, reliability, and scalability, and details why a distributed architecture is needed for multi‑system collaboration and fault tolerance.

Backend ArchitectureDistributed SystemsScalability
0 likes · 3 min read
Why Distributed Message Queues Are Essential for Scalable Systems
21CTO
21CTO
Feb 9, 2016 · Operations

Weibo’s Cross‑IDC Image Storage: Scaling Architecture & Real‑Time Compression

This article explains how Weibo’s massive image‑hosting platform uses a cross‑IDC distributed object storage system, optimized upload/download pipelines, and a custom compression library to handle billions of images and extreme traffic spikes during events like the Chinese New Year.

Backend ArchitectureImage storageScalability
0 likes · 8 min read
Weibo’s Cross‑IDC Image Storage: Scaling Architecture & Real‑Time Compression
21CTO
21CTO
Feb 6, 2016 · Backend Development

How LinkedIn Scaled to 300M Users: Lessons from a Decade of Backend Architecture

This article chronicles LinkedIn's evolution from a monolithic Leo application to a massive micro‑service ecosystem, detailing the introduction of member graphs, read‑only replicas, caching layers, Kafka pipelines, Rest.li APIs, super‑blocks, and multi‑data‑center strategies that enable handling billions of requests daily.

Backend ArchitectureKafkaLinkedIn
0 likes · 8 min read
How LinkedIn Scaled to 300M Users: Lessons from a Decade of Backend Architecture
21CTO
21CTO
Feb 4, 2016 · Backend Development

How Tumblr Scaled to 5 Billion Page Views: Inside Their Distributed Architecture

This article examines how Tumblr handled rapid growth—processing 5 billion daily page views, 40 k requests per second, and terabytes of data—by evolving from a LAMP stack to a Scala‑based, Finagle‑driven distributed system with HBase, Redis, Kafka, and a cell architecture that supports massive real‑time dashboards.

Backend ArchitectureDistributed SystemsFinagle
0 likes · 21 min read
How Tumblr Scaled to 5 Billion Page Views: Inside Their Distributed Architecture
21CTO
21CTO
Jan 22, 2016 · Backend Development

Mastering Scale‑Up: How to Maximize Single‑Server Concurrency for Web Apps

This article explains why high‑concurrency design is essential for modern internet services, compares vertical (scale‑up) and horizontal (scale‑out) scaling, revisits the C10K/C10M challenges, and reviews process, thread, coroutine, and event‑driven models to help engineers build ultra‑scalable web servers.

Backend ArchitectureEvent-drivenScale‑Up
0 likes · 13 min read
Mastering Scale‑Up: How to Maximize Single‑Server Concurrency for Web Apps
21CTO
21CTO
Jan 18, 2016 · Backend Development

From MUD1 to Modern MMO: Evolution of Game Server Architectures

This article traces the development of game server architectures from early text‑based MUD systems through first‑generation HTTP‑based services for simple card and runner games, to the complex, distributed backend designs used by modern MMORPGs, highlighting key technologies, design choices, and scaling challenges.

Backend ArchitectureMMOMUD
0 likes · 11 min read
From MUD1 to Modern MMO: Evolution of Game Server Architectures
Qunar Tech Salon
Qunar Tech Salon
Jan 17, 2016 · Backend Development

Design and Technical Challenges of High‑Concurrency Flash Sale (Seckill) Systems

This article analyzes the characteristics and technical challenges of flash‑sale (seckill) systems, proposes isolation and static‑page strategies, outlines architecture principles, detailed front‑end and service‑layer designs, discusses database sharding, caching, concurrency control, overload protection, and anti‑cheat measures to ensure reliable high‑throughput order processing.

Backend Architecturecachingflash sale
0 likes · 31 min read
Design and Technical Challenges of High‑Concurrency Flash Sale (Seckill) Systems
21CTO
21CTO
Jan 12, 2016 · Backend Development

Scalable Distributed Image Storage and Load Balancing for Web Sites

This article explains why serving many images strains web servers, outlines the challenges of I/O bottlenecks, and presents a practical, scalable solution that uses distributed image servers, dynamic load balancing, random selection algorithms, and health monitoring to improve performance for medium‑size business sites.

Backend ArchitectureScalabilitydistributed storage
0 likes · 9 min read
Scalable Distributed Image Storage and Load Balancing for Web Sites
Architect
Architect
Jan 11, 2016 · Backend Development

Understanding Redis’s Reactor Pattern and I/O Multiplexing

This article explains how Redis, a single‑process single‑threaded in‑memory database, uses the Reactor pattern and various I/O multiplexing techniques such as select, poll, epoll, and kqueue to efficiently handle thousands of concurrent client connections.

Backend ArchitectureI/O MultiplexingReactor Pattern
0 likes · 12 min read
Understanding Redis’s Reactor Pattern and I/O Multiplexing
21CTO
21CTO
Jan 10, 2016 · Backend Development

Designing a Scalable High‑Concurrency Distributed Backend for Millions of PV Sites

This article outlines a comprehensive design for a high‑concurrency distributed backend system that handles tens of millions of page views, detailing group‑based data partitioning, master‑slave roles, consistency models, heartbeat services, and global coordination to achieve scalability and fault tolerance.

Backend ArchitectureConsistencyScalability
0 likes · 19 min read
Designing a Scalable High‑Concurrency Distributed Backend for Millions of PV Sites
21CTO
21CTO
Jan 5, 2016 · Backend Development

Inside Xiaomi Push Service: Architecture, Performance, and Lessons Learned

The article details Xiaomi Push Service's XMPP‑based protocol, multi‑layer server architecture, client SDK design, scalability measures, security mechanisms, performance metrics during the 11.11 promotion, major refactorings, and practical insights for building high‑throughput push systems.

Backend ArchitectureScalabilityThrift
0 likes · 9 min read
Inside Xiaomi Push Service: Architecture, Performance, and Lessons Learned
21CTO
21CTO
Dec 16, 2015 · Backend Development

Inside Sina Weibo’s Architecture: Scaling to Billions of Users

During a 2015 tech salon, Weibo platform architect Wei Xiangjun dissected the essence of system architecture, illustrating how Sina Weibo scales to billions of users through multi‑layered services, sharding, CDN, multi‑datacenter caching, orthogonal decomposition, and robust monitoring, offering practical insights for large‑scale backend design.

Backend ArchitecturePerformance OptimizationScalability
0 likes · 22 min read
Inside Sina Weibo’s Architecture: Scaling to Billions of Users
21CTO
21CTO
Dec 11, 2015 · Backend Development

How 58.com Scaled from 10k to Over 1 Billion Visits: Lessons in Evolving Architecture

From a single‑machine “all‑in‑one” setup to a distributed, service‑oriented architecture, 58.com’s journey illustrates how startups can evolve their backend systems—adopting LAMP, read/write splitting, vertical splitting, caching, Java migration, and automated services—to handle traffic growth from tens of thousands to over a billion visits.

Backend ArchitecturePerformance OptimizationScalability
0 likes · 15 min read
How 58.com Scaled from 10k to Over 1 Billion Visits: Lessons in Evolving Architecture
21CTO
21CTO
Dec 11, 2015 · Backend Development

From Simple Polling to Scalable Microservices: JD’s Dongdong IM Evolution

This article chronicles the architectural journey of JD’s Dongdong instant‑messaging platform, detailing its early simple polling design, subsequent performance and scalability challenges, and the progressive shifts toward service‑oriented, micro‑service, and cloud‑native architectures that support massive user growth.

Backend ArchitectureIM SystemMicroservices
0 likes · 11 min read
From Simple Polling to Scalable Microservices: JD’s Dongdong IM Evolution
21CTO
21CTO
Nov 28, 2015 · Backend Development

How 58.com Scales 40 Billion Daily Requests: Inside Its IM and Mobile Architecture

This article examines 58.com’s BangBang system architecture, detailing its four‑layer backend design, evolution from a traditional IM to a mobile management platform, and the push technologies used to support massive O2O traffic and millions of concurrent users.

Backend ArchitectureO2OScalability
0 likes · 8 min read
How 58.com Scales 40 Billion Daily Requests: Inside Its IM and Mobile Architecture
21CTO
21CTO
Nov 25, 2015 · Backend Development

How Uber Scales Its Real‑Time Ride‑Sharing Platform: Architecture & Lessons

This article examines Uber's rapid 38‑fold growth and the engineering choices behind its real‑time market platform, detailing the scheduling system, geographic indexing, microservices, Ringpop, TChannel, and strategies for scalability, availability, and fault tolerance.

Backend ArchitectureMicroservicesScalability
0 likes · 22 min read
How Uber Scales Its Real‑Time Ride‑Sharing Platform: Architecture & Lessons
21CTO
21CTO
Nov 18, 2015 · Backend Development

How Xiaomi Engineered a High‑Performance Flash‑Sale System for the 2014 Mi Fan Festival

This article details Xiaomi's step‑by‑step design and evolution of its flash‑sale platform, covering the initial PHP‑Redis solution, the challenges of extreme concurrency, and the later Go‑based architecture that enabled millions of users to purchase smartphones reliably during the 2014 Mi Fan Festival.

Backend ArchitectureDistributed SystemsGo
0 likes · 15 min read
How Xiaomi Engineered a High‑Performance Flash‑Sale System for the 2014 Mi Fan Festival
21CTO
21CTO
Nov 12, 2015 · Backend Development

How China’s Top E‑commerce Giants Engineer Their Backend for Double‑11 Traffic Surges

This article examines how leading Chinese e‑commerce platforms such as Dangdang, Suning, Mogujie, and Vipshop redesign their backend systems, adopt decoupling, caching, scaling, and monitoring techniques to handle the massive traffic spikes of the Double‑11 shopping festival.

Backend ArchitecturePerformance Optimizatione‑commerce
0 likes · 21 min read
How China’s Top E‑commerce Giants Engineer Their Backend for Double‑11 Traffic Surges
dbaplus Community
dbaplus Community
Nov 11, 2015 · Backend Development

Designing Scalable Flash‑Sale Architecture to Survive Traffic Surges

This article explains how to design a high‑availability flash‑sale system by separating business and data layers, using Redis queues for pressure isolation, ensuring inventory consistency, handling transaction reconciliation, and addressing anti‑fraud measures to cope with massive concurrent traffic.

Backend ArchitectureScalabilityflash sale
0 likes · 16 min read
Designing Scalable Flash‑Sale Architecture to Survive Traffic Surges
21CTO
21CTO
Nov 6, 2015 · Backend Development

How WeChat & Momo Scale IM: Lessons on Battery, Network, and Custom Protocols

This article analyzes the architectural choices behind WeChat and Momo instant‑messaging services, covering battery and traffic constraints, network reliability, the shift from XMPP to proprietary long/short connections, protocol design with protobuf, and operational strategies for scaling massive user bases.

Backend ArchitectureInstant MessagingProtobuf
0 likes · 12 min read
How WeChat & Momo Scale IM: Lessons on Battery, Network, and Custom Protocols
21CTO
21CTO
Nov 2, 2015 · Backend Development

How WeChat Scales: Backend Architecture for Ultra‑Low Latency Messaging

The article outlines WeChat’s backend design that achieves seamless, low‑latency messaging through a minimalist sync protocol, efficient notification mechanisms, a three‑tier RPC framework, user‑level thread concurrency, and globally distributed IDC architecture ensuring high availability and eventual consistency.

Backend ArchitectureDistributed SystemsRPC
0 likes · 7 min read
How WeChat Scales: Backend Architecture for Ultra‑Low Latency Messaging
21CTO
21CTO
Oct 29, 2015 · Backend Development

Scaling Sina's News Comment System: From 3.0 to 5.0 – Key Backend Lessons

This article chronicles the evolution of Sina's news comment platform from a single‑server C++/MySQL prototype to a multi‑node, asynchronous, Python‑based architecture, highlighting the caching, sharding, and queueing techniques that enabled the system to survive massive traffic spikes without downtime.

Backend ArchitectureMessage QueuePerformance Optimization
0 likes · 21 min read
Scaling Sina's News Comment System: From 3.0 to 5.0 – Key Backend Lessons
21CTO
21CTO
Oct 24, 2015 · Backend Development

How to Build Scalable, High‑Performance Large‑Scale Websites: Architecture Evolution

This article examines the core challenges of massive web platforms—huge user bases, high concurrency, and massive data—and walks through a step‑by‑step evolution of architecture from a single‑server setup to distributed caching, clustering, read/write separation, CDN, and micro‑service strategies for achieving high availability, performance, and security.

Backend ArchitectureDistributed SystemsScalability
0 likes · 10 min read
How to Build Scalable, High‑Performance Large‑Scale Websites: Architecture Evolution
21CTO
21CTO
Oct 1, 2015 · Backend Development

Inside WeChat Red Packets: User Motives, UI Flow, and Backend Architecture

This article dissects the entire WeChat red‑packet ecosystem, exploring why users send and grab packets, the entry points, detailed UI screens, database schema, random‑distribution algorithms, caching strategies, and the full front‑end/back‑end interaction sequence.

Backend ArchitectureDatabase designUI flow
0 likes · 25 min read
Inside WeChat Red Packets: User Motives, UI Flow, and Backend Architecture
21CTO
21CTO
Sep 21, 2015 · Backend Development

What Can Three Kingdoms Heroes Teach Us About Building a Robust Web Framework?

Drawing parallels between Three Kingdoms figures and web framework components, the article explains how each module—from the entry point to data and cache layers—functions, offering practical insights into designing clear, maintainable, and high‑performance backend architectures for modern web applications.

Backend ArchitectureSoftware EngineeringWeb framework
0 likes · 9 min read
What Can Three Kingdoms Heroes Teach Us About Building a Robust Web Framework?
21CTO
21CTO
Sep 10, 2015 · Backend Development

Inside 58.com’s Mobile O2O Platform: Architecture, Evolution, and Push Tech

Sun Xuan, a system architect at 58.com, details the evolution of the company's merchant mobile management platform—from its early IM‑centric design through third‑party service integration to a lightweight client architecture—while also dissecting core O2O technologies such as long‑connection push, LBS, and cross‑platform notification strategies.

Backend ArchitectureIMScalable Systems
0 likes · 9 min read
Inside 58.com’s Mobile O2O Platform: Architecture, Evolution, and Push Tech
Architect
Architect
Sep 2, 2015 · Backend Development

Backend Architecture Refactoring with Golang: Design, Data Flow, and Performance Optimizations

The article details a backend architecture overhaul using Golang to address search inefficiencies, slow response times, and low conversion rates by introducing asynchronous data filtering, fast in‑memory computation, and performance‑tuned serialization and garbage‑collection strategies.

Backend ArchitectureGolangPerformance Optimization
0 likes · 8 min read
Backend Architecture Refactoring with Golang: Design, Data Flow, and Performance Optimizations
21CTO
21CTO
Aug 31, 2015 · Backend Development

Scaling JD.com’s Product Detail Pages with Dynamic, High‑Performance Architecture

This article details the evolution and redesign of JD.com’s product detail page architecture, describing the transition from static HTML generation to a dynamic, high‑performance, multi‑datacenter system built on key‑value storage, Nginx + Lua, asynchronous processing, multi‑level caching, and robust scaling and reliability strategies.

Backend ArchitectureLuacaching
0 likes · 34 min read
Scaling JD.com’s Product Detail Pages with Dynamic, High‑Performance Architecture
High Availability Architecture
High Availability Architecture
Aug 31, 2015 · Backend Development

High‑Availability Architecture for JD.com Product Detail Pages

This article describes how JD.com redesigned its product detail page system from a static, cache‑heavy architecture to a fully dynamic, multi‑level cached service using Nginx+Lua, JIMDB, and asynchronous workers, addressing scalability, performance, and high‑availability challenges for billions of daily page views.

Backend ArchitectureJimdbProduct Detail Page
0 likes · 30 min read
High‑Availability Architecture for JD.com Product Detail Pages
21CTO
21CTO
Aug 18, 2015 · Cloud Computing

What I Learned Building a Hybrid Cloud System: Architecture, Tools, and Best Practices

Over the past two months I helped develop a distributed hybrid‑cloud platform, tackling challenges from OS differences and network ports to message queues, logging, multi‑language integration, and testing, and I share the architectural decisions, tooling choices, and practical lessons learned for building robust backend systems.

Backend ArchitectureDistributed SystemsRabbitMQ
0 likes · 12 min read
What I Learned Building a Hybrid Cloud System: Architecture, Tools, and Best Practices
21CTO
21CTO
Aug 15, 2015 · Backend Development

Inside Weibo’s Third‑Generation Backend Architecture: Scalability and High‑Availability

An in‑depth look at Weibo’s evolution to its third‑generation backend system, detailing the orthogonal decomposition model, three‑tier horizontal layering, key middleware such as MCQ, Motan RPC, SSDCache, and the WatchMan tracing platform that together enable high‑availability, massive concurrency, and low‑latency services for billions of users.

Backend ArchitectureDistributed Tracinghigh availability
0 likes · 12 min read
Inside Weibo’s Third‑Generation Backend Architecture: Scalability and High‑Availability
Architect
Architect
Jul 22, 2015 · Backend Development

Using an API Gateway in a Microservices Architecture

The article explains how an API Gateway can consolidate multiple fine‑grained microservice endpoints into a single coarse‑grained API for mobile clients, discussing its design considerations, benefits, drawbacks, and implementation techniques such as reactive programming, service discovery, and fault tolerance.

Backend Architectureapi-gatewayfault tolerance
0 likes · 13 min read
Using an API Gateway in a Microservices Architecture
Java High-Performance Architecture
Java High-Performance Architecture
Jul 20, 2015 · Backend Development

When to Use Session Sharing vs. Session Persistence in Load‑Balanced Backends

The article explains why session sharing across servers solves independent session issues but is unsuitable for tightly coupled multi‑step interactions or frameworks with special session handling, and introduces session persistence (sticky sessions) such as Nginx's ip_hash to keep a user bound to a single backend server.

Backend Architectureload balancingsession persistence
0 likes · 3 min read
When to Use Session Sharing vs. Session Persistence in Load‑Balanced Backends
Architect
Architect
Jul 20, 2015 · Backend Development

Weibo Image Storage Architecture and High‑Performance Image Processing Pipeline

The article describes Weibo's large‑scale cross‑IDC distributed image storage system, its upload and download workflows, the challenges of massive seasonal traffic spikes, and the custom pipeline and lightweight compression library designed to achieve strong consistency and low‑latency image delivery.

Backend ArchitectureImage storageWeibo
0 likes · 8 min read
Weibo Image Storage Architecture and High‑Performance Image Processing Pipeline
High Availability Architecture
High Availability Architecture
May 21, 2015 · Backend Development

Understanding Instant Messaging (IM) Architecture, Protocol Design, and Real‑Time Web Chat Implementation

This article explains the fundamentals of instant messaging, its system characteristics, protocol layers (application, security, transport), practical protocol examples, and a detailed real‑time web chatroom design using HTTP long‑polling and backend architecture considerations.

Backend ArchitectureInstant Messagingprotocol design
0 likes · 20 min read
Understanding Instant Messaging (IM) Architecture, Protocol Design, and Real‑Time Web Chat Implementation
Art of Distributed System Architecture Design
Art of Distributed System Architecture Design
Feb 27, 2015 · Backend Development

How WeChat Processed Over 1 Billion Red Packets: Backend Architecture and High‑Concurrency Strategies

The article explains how WeChat’s backend handled the massive surge of red‑packet traffic during the 2015 New Year by employing loss‑tolerant services, flexible availability, modular design, asynchronous processing, and overload protection to ensure fast, accurate, and stable user experiences.

Backend ArchitectureLossy ServiceScalability
0 likes · 9 min read
How WeChat Processed Over 1 Billion Red Packets: Backend Architecture and High‑Concurrency Strategies
Nightwalker Tech
Nightwalker Tech
Jan 4, 2015 · Backend Development

Design and Pitfalls of Internet App Long‑Connection Push Systems and Related Backend Practices

This article surveys the architecture of long‑connection push systems for internet apps, distinguishes connection types, outlines client and server handling strategies, reviews mainstream backend solutions, and shares practical insights on security, API design, operations, queue services, debugging, and NoSQL usage.

Backend ArchitectureDebuggingMessage Queue
0 likes · 32 min read
Design and Pitfalls of Internet App Long‑Connection Push Systems and Related Backend Practices
Ctrip Technology
Ctrip Technology
Oct 15, 2014 · Backend Development

Why Read/Write Separation Belongs in the Service Layer, Not Just the Database

The article explains that database read/write separation offers limited performance gains and mainly serves data safety, while true scalability for read operations comes from caching and server clusters, and that write operations require a single dedicated server and actor‑model programming for safe concurrency.

Backend ArchitectureRead-Write Separationactor-model
0 likes · 6 min read
Why Read/Write Separation Belongs in the Service Layer, Not Just the Database
Baidu Tech Salon
Baidu Tech Salon
Jun 9, 2014 · Game Development

Build vs Buy: Key Considerations for Mobile Game Backend Development

When deciding whether to build or buy a mobile game backend, evaluate the backend’s impact on gameplay, your team’s expertise and resource availability, the long‑term maintenance and update commitments, risk tolerance, and budget constraints to choose the most scalable, cost‑effective solution.

Backend ArchitectureGame BackendScalability
0 likes · 9 min read
Build vs Buy: Key Considerations for Mobile Game Backend Development
Baidu Tech Salon
Baidu Tech Salon
Apr 30, 2014 · Backend Development

Logical Coupling, Service Layer Design, and Distributed System Architecture for Large-Scale Web Applications

The article examines the inevitability of service coupling in large‑scale web applications and proposes a two‑dimensional architecture that separates business and logic layers, uses internal data stores, introduces a naming‑and‑location service, selects appropriate transport and RPC protocols, and automates operations with health checks, load balancing, and failover to achieve continuous reliability.

Backend ArchitectureDistributed SystemsJava
0 likes · 29 min read
Logical Coupling, Service Layer Design, and Distributed System Architecture for Large-Scale Web Applications