This article explores common cache challenges such as centralized expiration, cache penetration, avalanche, hot keys, large keys, data consistency, and concurrent pre‑warming, offering practical design patterns and mitigation strategies to build robust, high‑performance backend systems.
This article introduces a lightweight Java logging utility class named LogUtils that supports four log levels, formats messages, and can output logs to the console or a file, with configurable level, target, and file settings, accompanied by example usage code.
This article explains the design and operation of an external resource manager that improves overseas e‑commerce service stability by employing CDN, local memory, and disk caches, detailing access methods, cache mechanisms, CDN configurations, and practical use cases such as Google Fonts and translation integration.
The article examines the evolution from monolithic to distributed architectures, contrasts Spring Cloud with Kubernetes and Istio, and explains how service mesh and sidecar proxies enable language‑agnostic, non‑intrusive microservice deployments in modern cloud‑native environments.
This article introduces ten common software architecture patterns—layered, client‑server, master‑slave, pipe‑filter, proxy, P2P, event‑bus, MVC, blackboard, and interpreter—explaining their structures, typical use cases, and advantages to help developers choose suitable designs for large‑scale systems.
The article explains how Tubi, an ad‑supported streaming platform with tens of millions of users, migrated from a Node.js‑Spark‑Redis stack to a Scala‑based backend to achieve sub‑10‑millisecond recommendation latency, improve fault tolerance, and simplify domain modeling using Akka and functional programming.
This article explains the fundamentals of database transactions, the ACID properties, Spring's @Transactional support, various propagation behaviors and isolation levels, and provides practical code examples for both declarative and programmatic transaction management in Java backend development.
This article explains why microservice architecture is preferred over monolithic applications, outlines a detailed learning roadmap covering core concerns such as Docker, container orchestration, API gateways, load balancing, service discovery, event buses, logging, monitoring, tracing, persistence, caching, and cloud providers, and recommends suitable tools for each component.
Short URLs are essential for many scenarios, and this article explores their components, including domain and path design, and dives into various path generation methods such as hash functions, auto‑increment IDs, distributed Snowflake algorithms, base‑62 encoding, and the trade‑offs between 301 and 302 redirects.
This article explains the core goals of microservice architecture, outlines essential design principles, and presents a comprehensive catalog of decomposition and design patterns—including Strangler, Bulkhead, Sidecar, API Gateway, Aggregator, Proxy, Chained, Branch, UI composition, database strategies, CQRS, Event‑driven, Saga, observability, logging, metrics, tracing, health checks, external configuration, service discovery, circuit breaker, and blue‑green deployment—providing practical guidance for building resilient, scalable systems.
This article walks through the complete OAuth2 token generation process, covering gateway pre‑processing, client authentication, request handling, authentication object assembly, password validation, token creation, storage options, and response handling with code examples and diagrams.
This article explains how to implement a custom PropertySourceLocator in Spring Cloud Alibaba, detailing the necessary spring.factories configuration, core classes like NacosConfigBootstrapConfiguration and NacosPropertySourceLocator, and the process of obtaining ConfigService, loading shared, extended, and application configurations from Nacos.
This article provides an extensive overview of backend architectural concepts, covering microservices fundamentals, gateway design, service registration, configuration management, observability pillars, tracing standards, logging practices, metric collection, service mesh implementations, and a detailed comparison of modern message queue technologies.
This article provides an in‑depth overview of modern backend architecture, covering microservice fundamentals, design principles, gateway patterns, service registration, configuration management, observability pillars, service mesh options, and a detailed comparison of popular message‑queue technologies.
This article presents a step-by-step guide to building a full-screen dashboard for LED displays, detailing requirement analysis, deployment options, overall architecture, key front‑end HTML/CSS layout, Echarts visualizations, back‑end Java REST API, JSON data handling, and configuration instructions.
This article explores the core goals of microservice architecture, outlines key design principles such as scalability and resilience, and presents a comprehensive catalog of decomposition, integration, cross‑cutting concern, and observability patterns—including API gateway, Strangler, Bulkhead, Saga, and CQRS—to guide developers in building robust, maintainable backend systems.
This article demonstrates how to set up an Nginx location block that proxies image requests to a PHP watermark service, provides a complete PHP Watermark class implementation, and shows a usage example for applying watermarks to images on the fly.
This article provides a comprehensive overview of microservice architecture, covering its core goals, design principles, various decomposition and integration patterns, database strategies, observability, resilience, deployment, and operational concerns, offering practical guidance for building scalable, maintainable services.
This article explains the concept of idempotency, outlines common business scenarios such as duplicate orders and payments, describes natural and required idempotent operations, and provides practical techniques—including unique keys, database constraints, and message‑queue handling—to ensure idempotent behavior in backend systems.
Redis caching can suffer from avalanche, breakdown, and penetration anomalies, but using staggered expirations, mutex locks, double‑key backups, high‑availability clusters, rate limiting, empty‑value caching, Bloom filters, warm‑up and degradation strategies effectively mitigates these risks and protects database stability.
This article provides an in‑depth overview of caching, covering its definition, when to use it, core concepts, various cache types (client, server, CDN, reverse‑proxy, in‑process, distributed), eviction policies, multi‑level cache architectures, common pitfalls such as cache avalanche, penetration and breakdown, and practical mitigation techniques.
This article explains why processing JSON in a statically‑typed language like Go can be cumbersome, demonstrates two basic approaches—using map[string]interface{} and struct tags—highlights their limitations, and introduces third‑party libraries such as SJSON and GJSON that make JSON reading and writing more concise and efficient.
This tutorial explains how to install Django with pip, create a new Django project and app, configure essential files, implement a simple HelloWorld view, and run the development server, providing step‑by‑step commands and code snippets.
This tutorial explains how to prevent overseas IP addresses from reaching a website by installing the libmaxminddb-devel dependency, adding the ngx_http_geoip2 module to Nginx, upgrading to Nginx 1.18, configuring GeoIP2 database paths, mapping country codes, and returning a 404 response for foreign requests.
This article provides a detailed examination of Node.js's built‑in path module, explaining common usage scenarios, the internal execution flow, and a line‑by‑line analysis of key utility functions like resolve and join, complete with code examples and a comparative behavior table.
This article compares three request‑merging approaches—Hystrix Collapser, a custom BatchCollapser implementation, and Guava’s ConcurrentHashMultiset—explaining their configurations, code examples, and suitable scenarios for reducing downstream load and improving system throughput while also highlighting performance trade‑offs and practical tips for integration in Spring‑Boot services.
This guide walks you through upgrading to Spring Boot 3.0 by adopting Java 17, moving to Spring Boot 2.7 first, cleaning deprecated APIs, adjusting configuration files, handling profile activation, and addressing compatibility and performance changes such as the new PathPatternParser.
This article explains the fundamental differences between RPC and HTTP services, covering OSI layers, RPC architecture, synchronous and asynchronous calls, and introduces popular RPC frameworks such as gRPC, Thrift, and Dubbo, while also showing a simple HTTP request example.
After a year of cross‑BU experimentation, the Tianji precision testing platform was built to centralize coverage data, automate incremental analysis, and provide actionable insights, resulting in higher test coverage, faster release gating, and measurable productivity gains for both developers and QA teams.
This article explains a complete backend user login process, including phone verification, token generation, token expiration strategies, gateway token validation, logout handling, anonymous request options, blacklist management, and provides a Spring‑Redis implementation for request‑rate limiting.
This article explains how to simulate user HTTP requests in automated testing by sending GET/POST requests with Java, storing and extracting cookies from the application’s cookie store, and returning them as JSON, accompanied by a complete code example.
This article presents a comprehensive summary of backend performance problems encountered in a production system—including slow queries, deep pagination, missing or ineffective indexes, excessive joins, large data volumes, thread‑pool and lock mis‑designs, machine issues, and caching strategies—along with concrete diagnostic steps and code‑level remedies to improve response times and stability.
Spring Security OAuth has reached end‑of‑life, with its documentation removed and code moved to a read‑only Spring attic repository; this guide explains how to detect deprecated dependencies, replace them with Spring Security 5.7’s OAuth2 Client, Resource Server, and the new Spring Authorization Server, ensuring a smooth migration to modern, supported authentication solutions.
The Hasura Storage team rewrote their Node.js service in Go, ran k6 benchmarks, and achieved up to five times more request handling, half the memory usage, and significantly lower response times across multiple download scenarios, demonstrating the scalability benefits of Go for backend services.
The article explains how Facebook built a stable, abstracted integration‑testing infrastructure for backend services, combining automated testing, fuzzing, record‑and‑playback, and isolation techniques to enable rapid prototyping while avoiding side effects and improving bug detection.
This article introduces the open‑source mall‑tiny rapid‑development scaffold, explains its core features and integration with the mall‑admin‑web front‑end, and provides a step‑by‑step guide to upgrading it to Spring Boot 2.7.0, covering Swagger, Spring Security, MyBatis‑Plus, circular‑dependency resolution, and CORS configuration.
This article explains how to design and implement a flexible, strategy‑pattern‑based state machine for e‑commerce after‑sale services, covering action abstraction, synchronous vs asynchronous execution, compensation via delayed MQ, and execution delay techniques to improve reliability and performance.
Facing billions of cached hotel records, Ctrip’s backend team analyzed Java object layout and HashMap memory costs, evaluated alternative structures, and applied bitmap, dictionary, run‑length and delta encodings to compress data, ultimately reducing cache size to under 2% of its original footprint.
The article explains how to address single‑point failures and capacity limits by clustering servers using replication patterns and introduces the AKF microservice splitting principle, detailing X‑axis horizontal replication, Y‑axis business‑oriented division, and Z‑axis data‑driven partitioning with diagrams.
This article explains three Redis‑based rate‑limiting methods—using SETNX for simple counters, leveraging ZSET for a sliding‑window algorithm, and implementing a token‑bucket scheme with LISTs—complete with Java code examples and discussion of their advantages and drawbacks.
This article explains how to shift authentication and authorization from the gateway to downstream Spring Cloud microservices by removing the gateway's ReactiveAuthorizationManager, defining three custom annotations (@RequiresLogin, @RequiresPermissions, @RequiresRoles), creating an AOP aspect to enforce them, and demonstrating their usage in controller methods.
This article walks through the background of a production Java service that received many performance complaints, enumerates common causes such as slow MySQL queries, complex business logic, thread‑pool misconfiguration, lock contention and machine issues, and provides concrete diagnostic steps and code‑level solutions including pagination fixes, indexing strategies, async processing, thread‑pool tuning, lock refinement and caching techniques.
This article provides a comprehensive overview of microservice architecture, covering its definition, history, differences from monolithic development, key characteristics, comparison with SOA, practical implementation steps, common design patterns, advantages and disadvantages, and essential considerations for successful adoption.
To handle dynamic file changes such as rule updates, configuration reloads, or log monitoring, this article compares three Java approaches—simple polling with File#lastModified, the OS‑integrated WatchService API, and the Apache Commons‑IO monitor—detailing their implementations, advantages, drawbacks, and practical usage tips.
The article compares delayed and scheduled tasks and presents five backend solutions—database polling with Quartz, JDK DelayQueue, Netty's HashedWheelTimer, Redis ZSET, and RabbitMQ delayed queues—detailing their implementations, code examples, outputs, and pros and cons.
Spring Boot 2.7.0 introduces major enhancements such as a new @AutoConfiguration annotation, upgraded Flyway modules, H2 2.1 support, GraphQL starter, Podman integration, Cache2k auto‑configuration, and several deprecations and test annotation improvements, providing a comprehensive update for Java backend developers.
This article introduces eight typical software architecture design patterns—including single-database single-application, content distribution, query separation, microservices, multi-level caching, sharding, elastic scaling, and multi-datacenter deployment—explaining their structures, typical use cases, advantages, disadvantages, and practical considerations for building scalable, reliable systems.
This article explains what rate limiting is, why it is needed, various strategies and algorithms such as leaky bucket, token bucket, fixed and sliding windows, and discusses challenges like inconsistency and race conditions in distributed systems, as well as different throttling types.
This article explains how to unify error handling between gRPC and traditional HTTP services by defining shared protobuf messages, mapping gRPC status codes to HTTP responses, and customizing response structures with additional fields like stat and msg for consistent business‑level error reporting.
This article examines how PHP stores variables internally by analyzing the zval structure defined in the C source code, detailing its fields, type flags, memory layout, and associated macros, and explains why each variable occupies 16 bytes at runtime.
This article walks through a simple Java file‑change watcher, reveals a JDK 8/9 bug where lastModified returns seconds instead of milliseconds, demonstrates the issue with test code, and presents a version‑file workaround to reliably detect updates.
The article introduces eight widely used software architecture design patterns—including single‑database, content distribution, query separation, microservices, multi‑level caching, sharding, elastic scaling, and multi‑datacenter deployment—explaining their typical structures, suitable scenarios, and the key pros and cons of each.
After upgrading to Spring Boot 2.6, a NullPointerException occurs when integrating Swagger due to the new PathPatternParser, and the issue can be resolved by changing the path‑matching strategy to ant_path_matcher or adding a custom WebMvcEndpointHandlerMapping bean.
This article explains why concurrency issues like overselling occur in e‑commerce, introduces distributed lock concepts and mainstream implementations (MySQL, Redis, Zookeeper/etcd), and provides a three‑stage quality‑assurance framework with code‑review checklists, testing methods, and data‑reconciliation techniques.
The article outlines Java thread‑pool fundamentals, explains ThreadPoolExecutor parameters and Tomcat’s custom pool behavior, and provides best‑practice guidelines for creating pools directly, configuring rejection policies, and safely using ThreadLocal—including static declarations, proper cleanup, and avoiding memory‑leak pitfalls—to build stable, high‑performance backend services.
This article introduces the SpringBoot‑Super‑Scheduled starter, explains how it dynamically manages native @Scheduled tasks without code changes, shows quick integration steps, and details the underlying implementation—including configuration management, post‑processor interception, dynamic proxy chaining, and runtime task control—complete with code examples.
This article presents a comprehensive overview of cache optimization techniques, covering benefits and costs, update policies, granularity control, penetration and avalanche mitigation, hot‑key reconstruction, and distributed batch‑operation strategies, with practical examples using Redis and MySQL.
This guide explains how to configure and read Nginx access and error logs, covering log format definitions, file locations, log level settings, and practical commands for parsing log entries to troubleshoot server and application issues.
The article details the architecture, challenges, and solutions of ByteDance's wallet asset platform that unified reward issuance, display, and usage across eight applications during the 2022 Spring Festival, covering high‑traffic order processing, token‑based asynchronous settlement, budget control, stability mechanisms, and future evolution.
This article compares traditional Java IO, JDK NIO, and the Netty framework, explaining their thread models, selector mechanisms, and performance trade‑offs, while providing complete server‑client code examples that demonstrate how Netty simplifies high‑performance network programming.
This article shares a detailed, step‑by‑step account of three interview rounds at ByteDance, covering the background, technical and algorithm questions on Java, Redis, MySQL, Kafka, and more, along with personal reflections and practical tips for future candidates.
This article provides an in‑depth tutorial on Spring Validation, covering basic usage, dependency configuration, requestBody and requestParam validation, unified exception handling, advanced techniques such as group, nested, and collection validation, custom validators, programmatic validation, fail‑fast mode, and the underlying implementation mechanisms.
This article explains various techniques for detecting and preventing duplicate backend requests—using unique request IDs, business parameter hashing, MD5 summaries, and Redis SETNX with expiration—providing Java code examples and a complete deduplication utility.
This article walks through creating a web‑based face‑recognition demo using Baidu Cloud AI, covering both front‑end video capture with HTML/JS and back‑end Java integration for user registration and login, complete with code snippets and key implementation steps.
To pre‑warm business data before a Spring web service accepts requests, the article explains two approaches—implementing the SmartLifecycle interface with proper phase ordering and using a ContextRefreshedEvent listener—while highlighting code examples, execution timing, and cautions against asynchronous overrides.
The article explains the concepts of cache penetration, cache breakdown, and cache avalanche—common Redis caching issues—provides concise definitions, shares personal interview experience, and recommends two detailed PHP‑CN articles for further online study.
This article explores three core rate‑limiting algorithms—Leaky Bucket, Token Bucket, and Sliding Window—detailing their principles, suitable scenarios, and provides complete Go implementations, enabling developers to choose and integrate the appropriate strategy for controlling request traffic without external dependencies.
This article explains how to integrate Spring Boot with MyBatis, configure a single Druid data source, implement multi‑data‑source support using Spring's AbstractRoutingDataSource, create a dynamic data source with ThreadLocal, and wire everything together with custom annotations, aspects, and transaction management for backend Java applications.
This article presents 36 practical guidelines for backend engineers covering interface parameter validation, compatibility, extensibility, idempotency, logging, error handling, security, rate limiting, caching, transaction management, and more, helping you design reliable, maintainable, and high‑performance APIs across any language.
This comprehensive guide explores essential backend development concepts—from system design principles like high cohesion and low coupling, through architecture patterns such as high availability and load balancing, to network communication, fault handling, monitoring, and deployment strategies, providing clear explanations for developers.
JetBrains announced that the IntelliJ platform will discontinue Log4j and adopt java.util.logging as the standard logging framework, providing migration steps, stub implementations, and security rationale for developers to update their plugins and codebases accordingly.
This page provides an extensive curated list of Groovy tutorials covering introductions, environment setup, syntax basics, GString, keywords, traversal, regular expressions, integration with Java, Gradle, JMeter, operator overloading, closures, reflection, performance comparisons, and advanced scripting techniques for backend development.
This guide explains the core principles of resource‑oriented API design, including naming resources, using standard and custom methods, modeling hierarchical collections, and adhering to stateless protocols, while drawing on REST concepts and Google’s API design guidelines.
This article explains how to replace raw PyMySQL usage with SQLAlchemy ORM in Python, covering environment setup, database connection initialization, MVC‑style project structure, model class definitions, field attributes, session handling with context managers, and practical code examples for saving and querying data.
This article introduces a curated list of notable PHP projects—including advanced machine‑learning libraries, a neural‑network framework, a natural‑language‑processing toolkit, a distributed long‑connection service, a database migration tool, a versatile filesystem abstraction, a C++ extension framework, and PHP‑FPM—highlighting their features, use‑cases, and sample code.
This article provides a comprehensive, step‑by‑step explanation of Netty’s pipeline architecture, detailing how ChannelHandlerContext wraps handlers, how inbound and outbound events are classified and propagated, and how handlers are added, removed, and initialized within the pipeline.
This guide compiles fifty practical Java performance recommendations—ranging from judicious use of singletons and static variables to efficient collection handling, memory management, and low‑level optimizations like bit‑shifts and System.arraycopy—each illustrated with concise explanations and code snippets to help developers write faster, leaner Java code.
This article introduces LiteFlow, a lightweight, fast, and stable component‑based rule engine, explains its design principles, shows step‑by‑step usage in both non‑Spring and Spring Boot environments, and dives into the core source code that drives parsing, chain execution, and node processing.
On May 14 the open‑source Fastjson library launched version 2.0.3, adding better compatibility with its 1.x line, native support for JDK 14 records, GraalVM native‑image compatibility, an improved extension mechanism, stronger JSONPath capabilities, Jackson annotation compatibility, and faster deserialization for heavily escaped JSON data.
This tutorial explains proxy fundamentals, compares forward and reverse proxies, details HTTP and HTTPS proxy header differences, and provides a complete, runnable Go implementation that listens on port 8080 and transparently forwards client requests to target servers.
This article examines a real‑world file‑watching failure caused by a JDK bug, explains how Java's WatchService works (including its polling fallback), compares it with Linux's inotify mechanism, and presents practical work‑arounds for reliable configuration reloads in backend services.
This article explores the architecture and implementation of a high‑concurrency train ticket flash‑sale system, detailing load‑balancing strategies, Nginx weighted round‑robin, Redis‑based inventory management, and Go code examples that demonstrate local and remote stock deduction, performance testing, and fault‑tolerant design.
This article explains Go's built-in error interface, distinguishes errors from exceptions, compares three common error-handling patterns, discusses wrapping errors with packages like pkg/errors, and demonstrates centralized error handling using errgroup, including usage examples and best-practice recommendations for backend Go development.
This guide explains how to set up separate configuration files for development, testing, and production in Spring Boot, modify them for each environment, and switch between environments using configuration properties, IDE settings, or command‑line arguments.
This article explains how the Python subprocess module is employed in a data construction platform, compares run and Popen methods, discusses challenges such as incomplete log capture and process termination, and presents three practical solutions to ensure reliable execution and logging.
This article explains how Spring's BeanFactory creates and caches beans, details the three‑level cache mechanism (singleton, early‑singleton, and singleton‑factory) used to resolve circular dependencies, and walks through the relevant source code and lifecycle methods.
This article outlines thirteen practical Redis performance‑optimization rules, covering command complexity, key expiration, data‑structure selection, persistence settings, hardware choices, clustering, and memory‑fragmentation monitoring to help developers maximize throughput and reduce latency in production environments.
This article explains Elasticsearch pagination mechanisms—including from/size, deep paging drawbacks, scroll, scroll‑scan, sliced scroll, search_after and point‑in‑time—detailing their inner workings, performance trade‑offs, configuration limits, and practical recommendations for handling large result sets.
This article explains why traditional select/poll struggle with massive connections, how epoll's event-driven design using a red‑black tree and ready‑list dramatically improves scalability, details its two trigger modes, and provides a complete C demo illustrating a high‑performance reactor model.
Microsoft's development team released a two‑year, user‑driven overhaul of the VS Code PowerShell extension, redesigning the PowerShell Editor Services engine, introducing a new thread model, adding 6,000 lines of code, removing 12,000, and improving stability, performance, and developer feedback mechanisms.
This article introduces the Go programming language, showcases several high‑traffic production projects built with Go at Autohome, and explains the major Go 1.18 enhancements such as generics, workspaces, and fuzzing, while providing performance comparisons, code samples, and practical optimization tips.
This article analyzes the challenges of aggregating multiple RPC calls in e‑commerce app backends, explains simple and complex concurrency scenarios, introduces grouped concurrency scheduling, and presents a self‑driven concurrency model that automates dependency handling to improve response latency and maintainability.
This article explains the fundamentals of JSON, its syntax rules, and demonstrates how PHP's json_encode and json_decode functions convert between arrays and JSON strings, including examples of sequential, non‑sequential, and multidimensional arrays, and the effect of the associative‑array option.
This guide explains how Nacos 2.1.0 introduces built‑in configuration encryption, how to add encryption plugins on the server, and how to mark configuration entries with a special prefix so that they are automatically stored and transmitted as ciphertext.
Learn how to install Node.js, set up the open‑source NginxConfig visual tool, generate Nginx configuration files for static and dynamic proxies, and deploy them on a Linux server, all with step‑by‑step commands, code snippets, and practical examples.
This article explains the core concepts of low‑code platforms, why visual editing requires declarative programming, compares declarative and imperative approaches, and details practical front‑end (using JSON‑to‑React via the open‑source AMIS framework) and back‑end storage and logic implementations with code examples.
The article explains the AKF principle for microservice design, detailing how X‑axis horizontal replication, Y‑axis functional splitting, and Z‑axis data‑centric partitioning address single‑point failures, capacity limits, and performance bottlenecks by employing master‑master, master‑slave, and master‑backup replication patterns.
This article walks through setting up the Go environment, defining protobuf files, generating code, and implementing both server and client sides of a gRPC service, complete with runnable examples, common pitfalls, and output verification to help developers quickly adopt Go‑based gRPC testing.
This article provides a comprehensive guide to Go's net/url package, covering import methods, key functions like PathEscape, PathUnescape, QueryEscape, QueryUnescape, as well as the URL type fields and methods such as Parse, ResolveReference, and utilities for query manipulation, all illustrated with practical code examples.
This article explains Java's Service Provider Interface (SPI) mechanism, its purpose, advantages, limitations, differences from APIs, and provides detailed code examples and real-world use cases such as JDBC, ShardingSphere, Spring, and SLF4J to illustrate how SPI enables pluggable, decoupled backend development.
