This article provides an in‑depth tutorial on Nginx, covering its core concepts, installation, configuration directives, reverse proxy, load balancing, caching, HTTPS setup, CORS handling, gzip compression, and the internal multi‑process architecture for high‑performance web serving.
This article reveals the most common Redis pitfalls—including unexpected key expiration, command‑induced blocking, data‑persistence hazards, and replication inconsistencies—explains why they happen, and provides concrete steps, code snippets and configuration tips to prevent performance degradation or data loss.
This article provides a comprehensive guide to Redis, covering its role as a non‑relational database, detailed data types and commands, persistence mechanisms (RDB and AOF), memory eviction strategies, high‑availability features such as replication, Sentinel and clustering, and solutions to typical cache problems like penetration, avalanche, and hot‑key handling.
This article provides a comprehensive overview of the HTTP protocol, covering its definition, stateless nature, connection handling, key characteristics, request/response workflow, header fields, status codes, caching mechanisms, and practical applications such as resumable downloads, multithreaded downloading, proxy servers and virtual hosting.
This article explains the LRU (Least Recently Used) caching principle, shows how to build an O(1) LRU cache using a HashMap and doubly linked list in Java, and describes Redis's approximate LRU eviction algorithm based on a global clock and random sampling.
This article compiles 21 practical Redis guidelines covering key naming, value sizing, expiration strategies, batch operations, risky commands, distributed lock patterns, cache consistency, capacity planning, and configuration tips, helping developers and operators build reliable, high‑performance Redis‑backed systems.
The article outlines eBay’s practical scalability principles—including functional partitioning, horizontal sharding, avoiding distributed transactions, aggressive asynchronous decoupling, moving work to async pipelines, virtualization, and intelligent caching—demonstrating how large‑scale web systems can be designed for linear growth and high availability.
This article explains why caching is essential for web performance, describes the two main HTTP cache types (strong and negotiated), compares Expires and Cache‑Control headers, and details ETag generation, validation, and best‑practice considerations in server implementations such as Nginx.
This article explores the fundamental principles of system architecture, illustrating how large‑scale services such as Uber and Weibo handle massive traffic through strategic abstraction, modularization, performance optimization, multi‑level caching, distributed tracing, and operational best practices to achieve scalability and reliability.
This article walks through the complete lifecycle of a browser request—URL parsing, DNS lookup, TCP handshake, OSI‑layer transmission, caching strategies, HTML rendering, and performance optimizations—mirroring real interview questions faced by front‑end engineers.
This article explains Youzan's Transparent Multilevel Cache (TMC), detailing its architecture, transparent Java integration, hotspot detection and local caching mechanisms, and demonstrates its real‑world performance gains during flash‑sale events and large‑scale marketing campaigns.
This article provides an in‑depth technical overview of how Pinterest scales its distributed cache layer using Memcached and Mcrouter on AWS, covering architecture, performance, high availability, load balancing, trade‑offs, and future directions.
The iQIYI International backend team boosted global video delivery by introducing a web‑cache layer, Brotli compression, and a two‑level Caffeine‑Redis caching system with pub/sub synchronization, achieving up to 6% faster First Contentful Paint, near‑100% cache‑hit rates, and measurable revenue gains.
This guide walks through customizing Nginx's 404 page, enabling the stub_status module to monitor server metrics, tuning worker processes and connection limits for higher concurrency, expanding client header buffers, and configuring static file caching to improve overall web performance.
This article compares Redis and Memcached across thread model, data structures, eviction policies, pipelining, persistence, high availability, and clustering, helping developers choose the most suitable in‑memory database for their specific performance and feature requirements.
This article details the practical upgrade from Webpack 4 to Webpack 5 in the Penguin Tutor H5 project, presenting build‑time comparisons, bundle‑size reductions, and in‑depth analysis of new features such as persistent caching, deterministic IDs, removed Node polyfills, enhanced tree‑shaking, and Module Federation, while also sharing common pitfalls and solutions.
Vue’s keep-alive component enables dynamic tab caching in B‑end applications by storing component VNodes in an internal LRU cache, preserving state across route switches, supporting include/exclude patterns, router‑meta flags, Vuex‑driven lists, and custom strategies for nested routes to prevent stale data and excess API calls.
This article explores the fundamental principles of system architecture by analyzing Weibo’s evolution to a multi‑layer, high‑traffic platform, covering scalability, service decomposition, caching strategies, distributed tracing, and operational best practices for building robust backend systems.
Node.js implements the CommonJS module system by using global require and module objects that, when a module is requested, resolve its absolute path, load and wrap the file, evaluate it to populate module.exports, cache the result, and handle exports, circular dependencies, JSON and native addons.
This article explains that Redis stores all data primarily in memory, describes its seven core data types (String, Hash, List, Set, Sorted Set, Pub/Sub, Transactions), shows how each type is implemented internally, and provides practical examples such as caching, ranking, queues, and real‑time analytics.
This article walks through the complete journey of a URL entered in a browser, covering URL parsing, DNS lookup, TCP handshake, OSI‑layer packet transmission, caching strategies, HTML parsing, rendering pipeline, and practical performance‑optimisation tips.
This article describes a backend architecture for a high‑traffic e‑commerce project, detailing a cache access component and a cache update platform that use asynchronous messaging, hotspot‑key handling, versioned cache entries, and Redis to achieve low latency, high QPS support and strong data consistency.
A large‑scale system that stacked a relational database, MongoDB, and a 200GB Redis cache suffered cascading failures, prompting a thorough analysis of Redis misuse and a redesign that introduces monitoring, controlled client libraries, proxy layers, sharding, and robust high‑availability strategies.
The paper presents a cluster‑aware Guava cache component for Alibaba’s Xianyu platform that mitigates downstream service failures by adding asynchronous reload, cluster‑wide key invalidation, and size reporting, enabling automatic fallback to refreshed local data and improving latency, with future plans for a management console, tiered storage, and disk‑backed caching.
This comprehensive guide covers 66 key computer networking topics, from the evolution of HTTP protocols and request methods to TCP/IP fundamentals, TLS/HTTPS security, web performance optimization, caching strategies, cookies, tokens, and common interview questions, providing clear explanations, diagrams, and practical examples for developers.
This article presents common Redis interview questions covering cache penetration, breakdown, and avalanche, explains RDB and AOF persistence mechanisms with configuration commands, and details memory‑size tuning, LRU/LFU/RANDOM eviction policies, plus a practical flushAll scenario.
This article introduces Redis as an open‑source, in‑memory data‑structure store, explains its role as a NoSQL database, details its five fundamental data types, common commands, expiration handling, pipelines, and transactions, and shows how it fits into modern scaling architectures.
This article explains how to design an elastic microservice architecture that can handle sudden traffic spikes, covering data partitioning, cache design, service layering, governance, adaptive circuit breaking, and auto‑scaling techniques using Go, gRPC, Kubernetes, and load‑balancing strategies.
This article compiles essential interview‑style questions and detailed answers on distributed system fundamentals—including CAP and BASE theories, consistency models, distributed transactions, Redis features and persistence, Zookeeper coordination, Kafka architecture, and common design patterns for high‑concurrency scenarios.
This comprehensive guide explains DNS fundamentals, hierarchical server architecture, query processes, packet structure, caching mechanisms, and common security threats, providing clear examples, diagrams, and practical insights for anyone preparing for networking interviews or deepening their understanding of internet name resolution.
This article explains how large‑scale internet applications can use various caching patterns—such as Cache‑Aside, Read‑Through, Write‑Through, and Write‑Behind—to alleviate database pressure, maintain data consistency, and avoid pitfalls like cache penetration, avalanche, and thundering under extreme traffic loads.
This article explains how large‑scale internet applications can use various caching patterns—Cache‑Aside, Read‑Through, Write‑Through, Write‑Behind—and mitigation techniques for consistency, stampede, penetration, jitter, and avalanche to keep databases from becoming performance bottlenecks under massive traffic spikes.
The article explains why growing business complexity and throughput demands force system decomposition and architectural upgrades, detailing horizontal scaling, vertical and business splitting, database sharding, caching strategies, and the evolution from monolithic to micro‑service structures.
This article explains how large‑scale internet applications can use various caching patterns—such as Cache‑Aside, Read‑Through, Write‑Through, and Write‑Behind—to reduce database load, avoid consistency problems, and mitigate high‑concurrency issues like cache avalanche and penetration.
This article explains why massive traffic spikes can cripple database performance, introduces cache layers and common caching patterns, and offers practical solutions to consistency, concurrency, penetration, and avalanche problems for large‑scale internet applications.
This article shares a senior architect’s ten‑year journey with caching, covering local page and object caches, refresh policies, distributed solutions like Redis and Memcached, pagination caching techniques, multi‑level cache architectures, common pitfalls, and practical optimization lessons for high‑performance backend systems.
This article analyzes the performance bottleneck caused by large Apollo configuration reads in a PHP application and presents multiple optimization strategies—including static variables, Yac/APCu caching, require‑file with opcache, and MessagePack serialization—to significantly lower CPU and memory consumption while maintaining configuration freshness.
The article explains how increasing business complexity and throughput demands drive system splitting, architectural evolution, and the adoption of scaling, sharding, caching, and asynchronous messaging techniques to improve capacity, robustness, and maintainability of large‑scale backend services.
This article presents thirteen practical Redis performance‑optimization rules—covering command complexity, key expiration, data structures, persistence, hardware choices, clustering, memory fragmentation, and client‑side techniques—to help developers identify bottlenecks and boost throughput and latency in production environments.
The article presents six practical guidelines for designing scalable software architectures, covering cost‑scalability trade‑offs, bottleneck identification, the dangers of slow services, database scaling challenges, the importance of caching, and the role of comprehensive monitoring to ensure reliable growth under heavy load.
This article explains common causes of cache unavailability such as single‑point failures, cache penetration and avalanche, and provides practical high‑availability strategies—including multi‑node deployment, multi‑datacenter redundancy, consistent hashing, pre‑loading hot keys, local caches, and staggered expiration—to keep production systems resilient.
This article provides a comprehensive overview of core backend engineering topics—including distributed architecture, vertical and horizontal scaling, cache strategies, asynchronous messaging, load‑balancing techniques, microservice design, high‑availability patterns, security mechanisms, and big‑data processing frameworks—aimed at helping fresh graduates and junior developers build interview‑ready knowledge.
This article explains a real‑world case where a newly added mapping rule didn't appear immediately due to master‑slave replication lag, walks through the evolution of database architectures from single‑node to read‑write separation, and presents several practical strategies to mitigate consistency issues caused by replication delay.
This article details how the L‑D stage of international hotel pricing was optimized through a new offline‑fetch scheduling mechanism, cache‑freshness calculations, and a comprehensive refactor of the rebuild system, resulting in lower latency, higher throughput, and a smoother user experience.
This article presents a detailed case study of how an international hotel division identified low pre‑sale service smoothness, defined quantitative metrics, analyzed caching and real‑time quote‑fetching trade‑offs, and redesigned the quote‑fetching scheduling mechanism to raise overall flow smoothness toward an 87% target.
This comprehensive guide covers essential Redis interview topics, including persistence mechanisms (RDB and AOF), cache challenges such as avalanche, penetration and pre‑warming, data types and their use cases, internal structures, eviction policies, single‑thread performance, clustering solutions, distributed locking, transactions, and best practices for high‑traffic environments.
This article explains the fundamentals of distributed architecture, describing its definition, key characteristics such as cohesion and transparency, common applications like distributed file systems, caches, and databases, and outlines the evolutionary stages from single‑server setups to clusters, load balancing, caching, CDN, NoSQL, and service‑oriented designs.
This article explains why changes to PHP code in the TP5.1 framework may require a 30‑second wait before appearing in the browser, revealing that the delay is caused by PHP's OpCache caching mechanism, which must be manually enabled in PHP 5.x but is often enabled by default in PHP 7.x, and provides guidance on diagnosing and resolving the issue.
Cache leverages the space‑time trade‑off to boost performance, but introduces complexity; this guide explains its fundamental idea, local vs distributed solutions, popular Java caching libraries, and key read/write patterns such as Cache‑Aside, Read‑Through, and Write‑Behind, highlighting benefits, drawbacks, and best‑practice considerations.
This article provides a comprehensive guide to Redis for interview preparation, covering persistence mechanisms, common caching challenges such as avalanche and penetration, data types and their use cases, internal structures, expiration policies, single‑threaded performance, clustering options, distributed locking, and best‑practice solutions.
This article details the evolution of Ctrip's Shark multilingual platform, describing how caching strategies and file redundancy were introduced to reduce database load, improve response times, and enhance overall system stability for a large-scale internationalized service.
The article explains why short URLs are widely used in spam messages, outlines the basic workflow of a URL shortening service, and discusses practical backend design choices such as ID generation, database storage, caching, batch allocation, and distributed architectures to achieve high concurrency and reliable one‑to‑one mapping.
This article explores how leveraging Alibaba Cloud's EdgeRoutine for Edge Side Rendering (ESR) and streaming rendering can dramatically reduce first‑screen latency, improve cache hit rates, and boost page load metrics during high‑traffic events like Double‑11.
The article describes a real‑time video recommendation indexing system that replaces 30‑minute batch builds with an Elasticsearch‑based service, integrates prior and posterior data pipelines, ensures consistency via locking and version checks, enables zero‑downtime upgrades, smooths write spikes, and boosts recall performance through multi‑level caching and ES tuning, delivering sub‑40 ms latency and significant business growth.
This article analyzes the business flow of flash‑sale (seckill) systems, identifies ten technical challenges such as high concurrency, bandwidth, stock‑deduction and cheating, and presents architecture principles, design patterns, code examples, and safety mechanisms to build a reliable, scalable backend for flash‑sale scenarios.
The article outlines practical backend performance optimization methods such as SQL tuning, eliminating duplicate calls, on‑demand queries, parallel execution, caching, asynchronous processing, JVM parameter tweaks, and horizontal scaling, providing code examples and actionable advice for developers.
This article examines the defining traits of large‑scale web systems and walks through the step‑by‑step evolution of their architecture—from single‑server LAMP setups to multi‑layer, distributed, and automated designs—highlighting performance, availability, scalability, and security considerations.
This article explains how a cloud‑based trade fair leverages AI techniques—including user and item profiling, multi‑level caching with Caffeine and Redis, and a Deep Interest Network model with attention mechanisms—to deliver personalized, high‑performance recommendations for exhibitors, buyers, and individual users.
This article walks through the step‑by‑step evolution of a Java‑based e‑commerce system—from a single‑server monolith to a fully distributed architecture with load balancing, read/write separation, caching, sharding, and service decomposition—highlighting the motivations, challenges, and key design decisions at each stage.
This article examines the end‑to‑end workflow of a flash‑sale system, outlines its unique characteristics and technical challenges, and presents a layered architecture—including frontend, site, service, and database designs—along with concurrency control, anti‑cheating measures, and data‑safety strategies for handling massive traffic.
This article walks through Redis’s role as an in‑memory data store, explains how simple HTTP caching evolves into server‑side memory caching, and details the progression to high‑availability and distributed architectures with persistence, Sentinel, replication, clustering, and advanced features like transactions, Lua scripting, pipelining, and distributed locks.
This article shares a front‑end engineer’s practical experience optimizing Vue SSR for a rapidly growing medical platform, covering background, SSR pros and cons, conventional and deep‑level caching strategies, CDN integration, network tuning, and the trade‑offs of each approach.
This article outlines the evolution of project architecture from single‑server MVC to RPC, SOA, and micro‑services, and provides clear explanations of core distributed‑system terms such as clusters, load balancing, caching, and flow control for developers.
This article explains the evolution of project architectures—from single‑server MVC to RPC, SOA, and micro‑services—while defining key terms such as clusters, load balancing methods, and various caching strategies essential for high‑concurrency, large‑scale backend systems.
This article provides a comprehensive overview of Redis interview topics, covering persistence mechanisms, cache avalanche and penetration problems, hot and cold data concepts, differences from Memcached, single‑thread performance, data structures, expiration policies, clustering solutions, distributed locks, transactions, and practical troubleshooting tips.
This article walks through eight progressive architecture upgrades—starting with physically separating the web server and database, adding page and fragment caches, scaling web servers, sharding databases, and finally adopting distributed caching—to illustrate how a high‑traffic site can maintain performance and reliability.
Performance optimization is a continuous, data‑driven practice that monitors response time and concurrency, applies techniques such as indexing, caching, parallelism, and asynchronous processing, and in Youzan’s live‑streaming product‑detail case reduced bottlenecks by adding multi‑level caches, circuit‑breaker fallbacks, and parallel sub‑task aggregation.
This article walks through nine practical Redis use cases—including basic KV caching, distributed locking, delayed queues, rate limiting, service discovery, bitmap storage, HyperLogLog counting, roaring bitmaps, and Bloom filters—explaining the underlying concepts, configuration tips, and code examples for robust backend development.
This article compares Redis and Memcached across thread models, data structures, eviction policies, pipelines, persistence, high availability, and clustering, helping developers choose the most suitable in‑memory database for their specific workload and performance requirements.
This article systematically compares Redis and Memcached across thread models, data structures, eviction policies, pipelining and transactions, persistence, high availability, and clustering, helping developers choose the most suitable in‑memory database for their specific business requirements.
This article explains what a Content Delivery Network (CDN) is, how it works through DNS and smart scheduling, its key components, and essential terminology such as CNAME records, origin host, and protocol origin, illustrating how CDN optimizes web traffic and speeds up user access.
This article explains what cache avalanche, cache breakdown, and cache penetration are, why they threaten database stability, and presents practical solutions such as mutex locking, pre‑warming, double‑cache, timed updates, empty‑value caching, Bloom filters, as well as common cache patterns like Cache‑Aside, Read/Write‑Through, and Write‑Behind.
This article explains the fundamentals of distributed systems, covering the CAP and BASE theorems, caching strategies, message queues, database choices, JVM optimization, and practical architectural improvements applied to New Oriental's mobile app to enhance availability and performance.
The article explains how MySQL stores persistent data while Redis serves read‑only data, outlines read/write request handling, discusses consistency issues in low and high concurrency scenarios, and provides practical solutions such as cache invalidation, queue‑based updates, and deployment considerations.
This article explains what a Content Delivery Network (CDN) is, how it optimizes web traffic through caching and intelligent DNS routing, details the traditional versus CDN-enabled access processes, and clarifies related terms such as CNAME records, DNS, origin host, and protocol origin.
This article provides a comprehensive, top‑down and bottom‑up explanation of Elasticsearch’s internal architecture, covering clusters, nodes, shards, Lucene segments, inverted indexes, stored fields, document values, caching, merging, routing, scaling, and query processing, while addressing common performance questions.
This article thoroughly examines the MyBatis selectList() execution process—including environment setup, mapper definitions, caching executors, parameter handling, statement preparation, and result set processing—by stepping through source code and debugging traces within a Spring Boot 2.3.3 context.
This article explains how to design and build a simple two‑level caching solution in Java, covering generic cache interfaces, local caching with Guava, distributed caching with Redis, configuration details, version‑controlled cache keys, and practical usage within a Spring Boot application.
This article explains how Nginx can be used for static file serving, various load‑balancing strategies, rate limiting with the leaky‑bucket algorithm, caching mechanisms, and black‑/white‑list access control, providing practical guidance for improving web service performance and reliability.
This article describes how Ctrip's iOS team reduced build times from nearly an hour to minutes by modularizing the codebase into bundles, applying incremental compilation with CCache, optimizing header search paths, and introducing a centralized cache for faster bundle retrieval.
This article explains the role of caching, service degradation, and flow control in high‑concurrency systems, introduces common rate‑limiting algorithms such as counters, leaky bucket and token bucket, and provides practical Java and Nginx implementations with code examples.
This article presents a comprehensive guide to designing high‑concurrency architectures for e‑commerce applications, covering server topology, load balancing, database clustering, caching strategies, concurrency testing tools, message‑queue based asynchronous processing, first‑level cache, static data handling, layering, distribution, service‑oriented design, redundancy, automation, and practical implementation examples.
Through systematic performance testing, caching strategy analysis, server configuration tuning, Elasticsearch shard optimization, and validator refactoring, the team transformed the recommendation service’s throughput from roughly 190 QPS to over 2,200 QPS, demonstrating how targeted backend optimizations can dramatically improve high‑concurrency applications.
This article details Youku's membership marketing system architecture, covering complex marketing scenarios, high‑availability and low‑latency requirements, rule‑based QL engine, unified marketing framework, multi‑cache storage, multithreaded matching, asynchronous reward distribution, and distributed transaction mechanisms.
Web performance is critical in today's online economy; this article explains ten practical NGINX‑based techniques—including reverse proxy, load balancing, caching, compression, SSL/TLS tuning, HTTP/2, software upgrades, Linux tweaks, server tuning, and real‑time monitoring—that together can deliver up to tenfold speed improvements and higher conversion rates.
This article explains Redis as an open‑source in‑memory data store used for caching, database, and messaging, walks through its evolution from simple HTTP caching to server‑side Redis, and details core features such as persistence, high availability, clustering, data types, transactions, Lua scripting, pipelining, and distributed locking.
The article explains how using an element's string representation as a cache key caused duplicate extraction in a Python news‑page parser, reveals the role of Python's garbage collection and memory reuse, and shows how switching to XPath keys resolves the bug.
This article presents ten actionable recommendations—including reverse‑proxy deployment, load balancing, caching, compression, SSL/TLS tuning, HTTP/2 adoption, software upgrades, Linux and web‑server tuning, and real‑time monitoring—to dramatically improve web application performance, often achieving tenfold speed gains.
This guide explains how to customize Nginx 404 error pages, enable and view the built‑in status module, increase concurrency limits, adjust client header buffers, and configure browser caching for static assets, providing step‑by‑step commands and configuration snippets.
This guide explains practical techniques—service splitting, caching, message queues, database sharding, read/write separation, and Elasticsearch—to design high‑concurrency back‑end systems that impress interviewers and handle real‑world traffic spikes.
This article presents ten practical NGINX‑based techniques—including reverse proxy deployment, load balancing, caching, compression, SSL/TLS optimization, HTTP/2 adoption, software upgrades, Linux tuning, web‑server configuration, and real‑time monitoring—that together can boost web‑application throughput and latency by up to an order of magnitude.
This article outlines ten practical techniques—including reverse proxy deployment, load balancing, caching, data compression, SSL/TLS optimization, HTTP/2 adoption, software upgrades, Linux tuning, web server configuration, and real‑time monitoring—that together can dramatically improve web application speed, reliability, and security.
This article details a real‑world migration from PHP to Golang for a high‑traffic mini‑program backend, explaining the performance bottlenecks of PHP, the advantages of Go such as goroutine concurrency and low‑memory footprint, the step‑by‑step implementation, caching strategy, monitoring, tooling, and the measurable latency and stability improvements achieved.
This article explains how Spring Boot automatically detects cache providers, shows how to replace the default ConcurrentHashMap with EhCache by adding the dependency, configuring ehcache.xml, and verifying the CacheManager type through unit tests, providing complete code examples and step‑by‑step instructions.
The article walks through Taobao's backend architecture evolution—from a single‑machine setup to distributed caching, load balancing, database sharding, microservices, containerization, and finally cloud deployment—explaining each stage's technologies, challenges, and design principles for building scalable, highly available systems.
This article explains a puzzling bug in the General News Extractor where cached HTML elements produce inconsistent results, analyzes how Python's garbage collection and memory reuse cause duplicate text extraction, and shows how switching the cache key to XPath resolves the issue.
This article explains the fundamentals of HTTP caching, the role of Service Workers, various cache layers (memory, disk, push), cache-control directives, and provides practical code examples to help front‑end developers improve page load speed and reduce server load.
This article explains the MySQL Memcached API, its evolution from MySQL 5.6 to 8.0, demonstrates how to install the plugin, configure tables, and perform batch and range key retrievals with code examples, highlighting suitable use cases and performance benefits.
This article explains how Taobao’s front‑end engineers tackled the massive traffic of the 618 promotion by optimizing resource requests, data fetching, module loading, monitoring, and fallback strategies, ultimately achieving smooth, high‑performance pages for billions of shoppers.
This article presents a comprehensive architectural analysis of Bilibili’s “Dayu” business gateway, detailing its motivations, design principles, async processing model, configurable pipelines, dynamic Ognl expressions, caching strategies, performance results, and practical lessons for backend developers.
