This article explains how to use the open‑source Java diagnostic tool Arthas to attach to a running JVM, view real‑time metrics, and employ the trace command to pinpoint and analyze time‑consuming methods without inserting manual timing code.
This article investigates a MySQL 8.0 TDSQL client experiencing connection interruptions during batch streaming, analyzes error 1161 (ER_NET_WRITE_INTERRUPTED) root causes in the MySQL source code, presents debugging steps with log and packet captures, and offers practical mitigation recommendations.
This article introduces the major enhancements of Python 3.11—including structural pattern matching, improved type hints, faster execution via PEP 659, richer error messages, the new | dictionary‑merge operator, built‑in breakpoint debugging, and other standard‑library additions—illustrated with concise code examples.
This guide explains why exec‑based pod debugging is limited and demonstrates how to use Kubernetes ephemeral containers to troubleshoot network issues, trace processes, and debug nodes without restarting the pod, including step‑by‑step commands and code examples.
Kelemetry, an open‑source tracing system from ByteDance, visualizes Kubernetes control‑plane events by treating each object as a span, linking audit logs, events, and component interactions to provide a unified, searchable view that simplifies debugging, performance analysis, and multi‑cluster observability.
The article explains a puzzling MySQL DELETE failure caused by a missing primary key, shows how Navicat adds an ESCAPE clause to the generated SQL, clarifies the purpose of ESCAPE in LIKE patterns, and reveals that the real issue was a mistaken condition order in the query.
This article explains how thorough code review, using tools like GoLand, Git plugins, and Postman, improves test case accuracy, data integrity, branch coverage, and overall software quality in Go projects, while offering practical tips on diff usage and highlighting the tangible benefits for testing teams.
The article recounts a production OutOfMemoryError incident caused by heap and metaspace exhaustion in a Java service, analyzes Mybatis's role in the memory leak, reproduces the issue with heavy SQL and multithreading, and offers concrete debugging and code‑optimization steps to prevent future crashes.
This article introduces the fundamentals of source-level debugging for WebAssembly, explains core debugging principles, discusses native and managed program debugging, examines various debugging information formats such as SourceMap and DWARF, and compares several practical debugging solutions—including Chrome DevTools, LLDB with wasmtime or iwasm, and WasmInspect.
This article explains the two primary PHP functions for displaying arrays—print_r() for readable output and var_dump() for detailed type and value information—provides syntax examples, and shows the resulting output of each function.
This article introduces several powerful Python libraries—Albumentations for image augmentation, MonkeyType for type inference, Bleach for HTML sanitization, Plotnine for data visualization, Returns for exception handling, ipdb for interactive debugging, and Virtualenv for environment isolation—detailing their use cases and providing example code for interface automation.
A Java backend service suffered a massive first‑request latency because the MD5 hashing library loaded heavy cryptographic algorithms on first use, and the author traced, diagnosed, and solved the issue by replacing the library and sharing lessons on performance debugging.
This article walks you through building a minimal Spring Boot demo, setting breakpoints, analyzing call stacks and logs, and tracing the @Transactional rollback logic in the framework source code to understand why certain methods roll back or commit.
This article walks through diagnosing V8FatalErrorCallback OOM crashes in an Electron‑based PC Taobao Live client, explores stack analysis, disables compilation cache, adjusts V8 heap limits, compiles a custom Electron without pointer compression, and uses Chrome DevTools Memory and Performance tools along with runtime monitoring to locate and fix the underlying memory leak.
The article details how the author traced V8FatalErrorCallback out‑of‑memory crashes in an Electron‑based Taobao Live client to an ever‑growing compilation cache and pointer‑compression limits, rebuilt Electron with those disabled, identified a JavaScript memory leak caused by unfiltered error logging, and implemented runtime heap monitoring to prevent future OOM failures.
This article details a real‑world Netty long‑connection memory‑leak case, explains how to reproduce the problem, uses Netty's advanced leak detection to pinpoint the faulty ByteBuf usage, and presents three practical remediation strategies to permanently fix the leak.
This article explains the root cause of the thread‑pool plugin enhancement failure in SkyWalking—duplicate AgentClassLoader instances—detailing the investigation steps, code changes, and two practical solutions to ensure reliable instrumentation of ThreadPoolExecutor.
This article explains the purpose, usage, constraints, and example code for several PHP magic methods—including __toString, __invoke, __set_state, __clone, __autoload, and __debugInfo—showing their effects, common pitfalls, and how they improve object handling and debugging in modern PHP applications.
The article recounts how a Java backend’s MD5‑based snapshot generation caused the first request to time out, details the investigation using Arthas to pinpoint the slow initialization of BouncyCastle algorithms, and explains the final fix by switching to a lightweight MD5 implementation.
The article recounts a production incident where a Java service’s CPU surged to 1200%, detailing how top, jstack, and jmap were used to trace the issue to a missing parameter that caused a full‑table scan, prolonged GC pauses, and ultimately a system freeze.
The article recounts a senior architect's investigation into FastJson's date formatting bug and circular reference handling, detailing version mismatches, GitHub issue tracking, feature flag usage, and lessons for backend developers on avoiding hidden serialization pitfalls.
This guide compiles 61 practical ADB commands covering device connection, app management, debugging tools, file transfer, input simulation, device control, and advanced operations, providing Android developers with a comprehensive cheat‑sheet for efficient testing and troubleshooting.
This article explains how to identify when a MySQL DDL operation is blocked, locate the blocking session using the sys.schema_table_lock_waits view, and resolve the issue by enabling necessary instruments and killing the appropriate connection, with examples for MySQL 5.7 and 8.0.
This article walks through the entire crash‑handling workflow for an Electron‑based Taobao Live client, covering why crashes occur, how to capture minidumps with Crashpad, report them to monitoring platforms, and analyze the dumps using Visual Studio or WinDbg.
This guide explains why dual-machine debugging is needed, outlines the two main scenarios (virtual machine and physical machine), and provides step‑by‑step instructions for configuring VirtualKD as well as network‑based kernel debugging on Windows systems, including common test cases and useful commands.
An engineer troubleshoots a .NET application login freeze by capturing a dump with WinDbg, discovers the thread blocked in MySQL SSL handshake, verifies the MySQL driver version, and resolves the issue by disabling SSL via the connection string, illustrating effective debugging without source code or logs.
The article analyzes why a sed command freezes while modifying a MySQL MHA installation script on a CentOS 6 system, identifies the charset conversion issue caused by GBK locale and missing spaces after comment symbols, and provides a step‑by‑step debugging and fix procedure.
A Java backend developer investigates sudden CPU spikes caused by hidden Nacos client threads, traces the issue through thread dumps and code analysis, explores Raft network partition behavior, and implements a fix that checks and recreates Nacos connections to prevent unnecessary thread creation.
The article explains why test engineers need solid programming skills, highlights Java's cross‑platform advantages, rich libraries, and simple syntax, and provides a step‑by‑step guide covering core concepts, development setup, coding standards, practice exercises, common APIs, debugging tips, and essential testing tools.
A seemingly harmless C bug caused a Windows build to ignore a ternary file‑creation expression because a stray backslash in a comment turned the following code into a comment, illustrating how tiny syntax errors can cripple cross‑platform programs.
This article walks through building a Spring @EventListener demo, explains how to decouple registration logic, shows step‑by‑step debugging of the event‑listener infrastructure, and explores the internal mechanisms that register and invoke listeners during application startup and runtime.
The article walks through a real‑world React‑Native white‑screen crash, explains how the Metro bundler transforms source code into a jsbundle, extracts two distinctive code‑feature patterns (e.default = v and return (0, l.default)(b,[{)), and demonstrates how these patterns can be used to locate the original component files responsible for the error.
This article explains how to evaluate the puzzling JavaScript expression console.log(([][[]] + [])[+!![]]+([]+{})[+!![]+ + !![]]), detailing the required knowledge of type coercion, unary operators, and implicit conversions to reveal why the output is “nb”.
This guide shows how to create a multi‑threaded C program on embedded Linux, set thread names with pthread_setname_np, and use the top command with the -H option to display each thread’s status, illustrating the difference when thread names are omitted.
This article describes how Meituan addresses the rapid growth of Flink SQL jobs by introducing fine‑grained TTL and concurrency settings, an editable execution plan for state migration, pre‑analysis compatibility checks, and a bytecode‑instrumented debugging system that captures operator data and streams it to Kafka for analysis.
This article details Meituan's implementation of Flink SQL at scale, covering fine‑grained job configuration, state‑TTL management, state‑migration techniques for job upgrades, a custom debugging tool for correctness issues, and future directions for Flink SQL enhancements.
A Python community member struggled with a regular expression that mishandled backslashes, but by converting the pattern to a raw string with an r prefix, the issue was resolved and the regex matched correctly, illustrating a common pitfall and its simple fix.
This guide explains what core dump files are, how to configure foreground and background processes to generate them on embedded Linux, and provides step‑by‑step commands and sample code for enabling core dumps and analyzing them with arm‑linux‑gnueabihf‑gdb.
The article introduces JupyterLab’s new visual debugger, explains why debugging is needed in Jupyter, provides installation commands for the front‑end extension and xeus‑python kernel, describes the debugger’s UI components and capabilities, and compares it with a VS Code visual debugging tool.
This article explains how ChatGPT, the popular AI chatbot, can boost developer productivity through testing, debugging, documentation, error detection, code completion, formatting, refactoring, search assistance, text classification, and summarization, while also highlighting its need for human oversight and risks such as plagiarism.
This article examines why a single Thread.currentThread().getStackTrace() call is insufficient for modern Android performance debugging, compares instrumentation and native stack‑capture approaches, and provides detailed step‑by‑step implementations, code snippets, and optimization tips for reliable stack tracing.
Learn a quick IntelliJ IDEA trick that lets you set a breakpoint to pause only when a loop reaches a particular iteration, eliminating the need to manually step through each cycle and speeding up Java debugging.
This guide shows programmers how to quickly locate errors in massive server logs using essential Linux commands such as tail, cat, grep, sed, and pagination tools, providing step‑by‑step examples and tips for efficient debugging.
This article explains common scenarios that cause CPU usage to soar above 200% in production, outlines step‑by‑step diagnosis and remediation for MySQL and Java processes, and shares real‑world case studies with command‑line tools, indexing, caching, and code adjustments to bring CPU load back to normal levels.
This article explains how to debug live Kubernetes pods using temporary (ephemeral) containers that share namespaces, covering cluster setup, creating workloads, diagnosing network problems, tracing processes, and accessing node shells without restarting the original pods.
This article walks through a real‑world incident where an update to a MySQL row was not visible to a subsequent read, explains how SkyWalking tracing revealed the exact timing of binlog writing, MQ delivery, and query execution, and offers practical mitigation strategies.
This guide walks through practical ways to make GDB debugging more efficient in the terminal, covering raw command‑line usage, the built‑in TUI mode, CGDB, Emacs GDB integration, and the browser‑based gdbgui, with configuration snippets and key bindings for each tool.
This article recounts a real‑world investigation of a MySQL high‑availability outage where HikariCP connections appeared to dead‑lock, detailing the architecture, observed symptoms, code analysis, thread‑dump findings, and the final fix of adding socket timeout parameters to the JDBC URL.
This guide walks you through installing VS Code on macOS, configuring essential C/C++ extensions, setting up the Clang/LLVM toolchain, creating a simple Hello World project, compiling, running, and debugging it using VS Code's tasks and launch configurations.
This article walks through a Python visualization issue raised in a community chat, shows the problematic code and error screenshots, explains the root cause identified by an expert, and provides the corrected implementation so readers can resolve similar problems themselves.
In this article, the author shares a real‑world pandas data‑processing problem caused by missing spaces, demonstrates the error, provides the corrected code snippet, and explains how the fix resolves the issue for fellow Python learners.
The article details a sudden CPU spike in a Java backend service using Nacos, walks through diagnosing the offending thread with top and jstack, analyzes Nacos client thread creation and scheduled gray‑config tasks, explains Raft network partition handling, and presents a fix that checks config health and avoids unnecessary thread creation.
This guide explains what crontab does, its syntax and options, provides practical examples, highlights typical problems such as environment variables, time misconfiguration, special characters and output redirection, and offers debugging tips and tools for reliable Linux task scheduling.
This comprehensive article explains what Android ANR (Application Not Responding) is, details its various causes and trigger scenarios, walks through the internal service‑side workflow, and presents practical monitoring solutions—including a watchdog thread and SIGQUIT signal interception—along with code samples, trace analysis methods, and mitigation strategies for developers.
This article investigates a MyBatis‑Plus bug where enum values with abstract methods become anonymous classes, causing the framework to fail to locate the correct TypeHandler, leading to SQL errors, and provides several practical solutions to avoid or fix the issue.
This article explains Android's Alarm mechanism, covering its overall architecture, the four alarm types, framework and kernel workflows, batch alignment, wake‑up handling, suspend processing, and a real‑world power‑debugging case to help developers optimize battery consumption.
This article demonstrates how to locate the source of abnormal MySQL connection traffic by identifying the offending socket, tracing its system‑call stack with strace, and correlating the activity to specific application logic such as create/drop database and workload tasks.
This guide explains what crontab does, how to write and manage user and system cron jobs, shows real‑world syntax examples, highlights typical pitfalls such as environment variables, time fields, special characters and output redirection, and provides debugging strategies including the crontab.guru online parser.
This article details several real‑world Flutter performance problems encountered at Soul—including excessive memory usage for emojis, iOS 14 debug launch restrictions, high CPU consumption of Lottie animations, background‑foreground flickering, and PlatformView memory leaks—and provides concrete mitigation strategies with code examples.
This guide walks you through turning the basic command‑line GDB into a far more efficient debugging environment by using GDB's built‑in TUI, custom .gdbinit scripts, the cgdb front‑end, Emacs gdb‑mode, and the browser‑based gdbgui, complete with key bindings, window layouts and practical tips.
This article explains the design, architecture, and evolution of Ant Cube Tool (ACT), a Node‑based CLI and VSCode‑enhanced solution that compiles, previews, and debugs Alipay Cube card DSLs, enabling efficient cross‑platform mobile dynamic content creation.
This article introduces Arthas, Alibaba's open‑source Java diagnostic tool, explains its installation, showcases common commands such as stack, jad, sc, watch, trace, jobs, logger, dashboard, and redefine, and demonstrates how to use them to monitor JVM status, trace method calls, inspect classes, and perform hot‑updates without restarting the application.
This article walks through a real‑world case of off‑heap memory leakage in the Dble proxy, detailing symptom observation, log analysis, monitoring, BTrace instrumentation, code review, and the eventual fix that delays buffer allocation until needed.
This article walks through a real‑world Python file‑handling problem, showing the initial mistake, the corrected approach using encoding, and the final working result, providing a practical example you can apply in your own projects.
This article explains what SIGKILL crashes are on iOS, how the operating system terminates a process, how to capture SIGKILL events using the MetricKit framework with code examples, the meaning of common termination codes, and practical fixes for typical SIGKILL scenarios in mobile apps.
The article details a step‑by‑step investigation of an intermittent deadlock occurring during session creation in a video‑conference system, explains how InnoDB lock types caused the conflict between DELETE and INSERT statements on the session and session_endpoint tables, reproduces the issue, debugs MySQL source code, and presents a simple code‑order fix to eliminate the deadlock.
The article explains how uncaught exceptions cause Electron app crashes on Windows, describes Windows’ user‑mode dump types, shows how Crashpad generates minidumps via a simple exception filter, demonstrates starting the built‑in crash reporter in JavaScript, and outlines uploading and analyzing dumps with Visual Studio or WinDbg, plus a watchdog restart strategy.
This guide walks through creating a React app, downloading the React source, building it, linking the packages, configuring webpack aliases, fixing import paths, disabling ESLint, adjusting environment variables, and resolving internal React errors so you can edit and debug the original React source directly in the browser.
A recent production incident caused by inserting a single log statement revealed how FastJSON's ASM‑generated serializer invokes methods like isChinaName(), leading to a NullPointerException, and the article dissects the root cause, serialization mechanics, and best‑practice annotations to prevent similar bugs.
This guide surveys essential frontend topics—including deep dives into lodash usage, iterator and generator concepts, Web3D visualizations, hybrid remote debugging, long‑task performance optimization, Chrome DevTools measurement, and creative image‑loading effects—offering practical insights for modern web developers.
A MySQL DBA recounts a 4‑TB InnoDB instance that stalled during startup, analyzes top, stack traces, and source code to pinpoint a bug involving truncate operations and the buf_flush_event, then presents three practical solutions—including adjusting innodb_flush_sync, using GDB to break the wait loop, or removing truncate logs—to restore normal operation.
This article outlines ten common developer missteps—from hoarding knowledge and skipping code reviews to weak testing and undocumented changes—and explains how avoiding them can transform you into a high‑value software engineer.
This article recounts a real‑world incident where a change to the Access‑Control‑Allow‑Origin header triggered CORS errors for credentialed requests, analyzes the CDN caching and Vary‑header issues that caused inconsistent responses, and outlines the steps taken to fix and prevent the problem.
Soul developed an Electron‑based hybrid app debugging tool that simulates H5 environments, bridges client‑side methods via CDP, and enables Chrome DevTools debugging of DOM, network, and touch events in webviews for effective troubleshooting.
This article explains how a Python web‑scraping request failed due to extra nested parameters, shows the step‑by‑step debugging process, and demonstrates that deleting trivial 0/1 values can restore the request, offering a practical tip for similar crawling issues.
This article compiles a series of frequent Go programming pitfalls—ranging from incorrect use of unsafe.Sizeof and variadic any parameters to slice expansion, pointer handling, closure capture, concurrency bugs, and serialization quirks—providing concrete code examples and safe alternatives to help developers write more reliable Go code.
The article walks through a MySQL MGR failover incident, analyzes the InnoDB assertion failure shown in the error log, pinpoints the problematic code at row0pread.cc line 727, compares the fix in MySQL 8.0.28, and references the related bug report for future troubleshooting.
This article details the investigation and resolution of a MySQL 8.0.21 client segmentation fault on CentOS 8.4, covering missing ncurses libraries, implicit function declaration warnings, pointer truncation on 64‑bit systems, core‑file generation, gdb analysis, and the steps required to rebuild the client without crashes.
Noslate is Alibaba’s new open‑source, cloud‑native serverless JavaScript runtime that combines a custom cold‑start‑optimized Node.js distribution, the Aworker container with Warmfork and V8 startup snapshots for sub‑millisecond launches, a Noslated control plane for flexible worker orchestration, and a Corefile‑based debugger for low‑impact diagnostics.
This guide explains how to locate and fix production JavaScript errors by generating source maps, injecting them via Charles proxy, and using VSCode exception breakpoints to debug the original source code as if it were running locally.
This guide walks you through the entire lifecycle of a Serverless application on Alibaba Cloud, covering function creation via the console, project initialization and deployment with Serverless Devs, various debugging techniques—including online, breakpoint, proxy, and local debugging—and best practices for dependency management and performance testing.
This guide explains the SCSI protocol, compares common hard‑disk interfaces such as IDE, SCSI, and SATA, shows how to install and use the lsscsi command with its options and examples, and details Linux SCSI file nodes and logging configuration.
Noslate is an open‑source, cloud‑native project from Alibaba that introduces a lightweight JavaScript runtime, optimized Node.js distribution, and an offline debugger to dramatically improve serverless cold‑start times, elasticity, and diagnostic capabilities across diverse platforms, including ARM and traditional x86 environments.
Noslate is an open‑source, cloud‑native suite comprising a custom Node.js distribution, the lightweight Aworker runtime with Warmfork and Startup Snapshot technologies, all designed to dramatically reduce cold‑start latency and improve JavaScript task elasticity in serverless environments.
This article walks through MyBatis's complete query lifecycle—from configuration parsing, SqlSessionFactory creation, and mapper loading to the actual SELECT execution—while reproducing a pre‑3.4.5 bug caused by foreach variable leakage and presenting the official fix and upgrade recommendations.
The article details a NullPointerException that occurs when ShardingSphere starts, explains how null values in TiDB‑generated view metadata trigger the error, describes the step‑by‑step investigation and reproduction using TiUP, and discusses several possible fixes and a call for community contributions.
Learn how Go’s embedded symbol table works, how to inspect and modify symbols using tools like nm and go tool nm, customize variables with ‑ldflags ‑X, and reduce binary size by stripping debug symbols, all illustrated with practical code examples.
An online promotion that should end at 23:59:59 displayed as finished early due to an 8‑hour discrepancy, traced through HTTP packet capture, DB fields, and Java’s Date handling, revealing that Date objects use the local timezone while timestamps are based on UTC, causing mismatched calculations.
This article explains the stages of code errors, the significance of learning debugging for QA, introduces various breakpoint types and their settings, demonstrates a factorial sum debugging case, and provides practical tips such as conditional breakpoints and expression evaluation to efficiently locate and resolve runtime issues.
The article investigates MySQL InnoDB lock‑wait timeouts caused by hanging transactions that lack proper commit or rollback, explains ACID and lock mechanisms, shows how stale ThreadLocal bindings let pooled threads reuse unfinished transactions, and recommends using @Transactional with robust try‑catch handling to prevent such deadlocks.
The nightly service latency spikes were traced to major page faults triggered by the category client’s lazy mmap of a 1.7 GB off‑heap store during package switches, not to GC or CPU throttling, and were resolved by upgrading to a version that pre‑loads the store in 64 MB chunks with brief pauses.
This article walks through a real Python Selenium web‑scraping issue, shows the error screenshots, explains why the script fails when the page isn’t fully rendered, and provides a reliable code solution along with practical tips for avoiding similar problems.
This comprehensive guide walks you through shell scripting fundamentals—including process management, function libraries, variables, control structures, loops, debugging tools, and automation—while providing practical code examples, best‑practice tips, and visual illustrations to help both beginners and seasoned developers write robust Bash scripts.
This article describes a comprehensive LLDB‑plugin based monitoring framework that intercepts Xcode’s Script Bridge API to measure and report precise debugging latency for Swift projects, outlines the implementation details, timing scenarios, data reporting, and includes a recruitment notice for the ByteDance client infrastructure team.
After a recent deployment a backend update operation became extremely slow, revealing RPC retry, thread‑pool misconfiguration, and row‑lock contention between services, which were analyzed and resolved through thread‑pool tuning and transaction separation.
This article outlines common Feign issues such as 400 Bad Request, illegal character errors, Chinese garbled text, multiple @RequestBody parameters, and read timeouts, and provides clear code‑based solutions and configuration tips for each problem.
This article explains how to start breakpoint debugging in IntelliJ IDEA, walks through the many toolbar buttons and their functions, introduces various breakpoint types such as method, property, exception, and demonstrates practical code examples for stream and multithreaded debugging.
This article explains the challenges of debugging low‑code platforms for non‑frontend developers, describes Alibaba’s layered architecture and low‑code debugging protocol, and details the core debugging features—error logs, component inspection, data source panels, schema view, and extensible plugins—designed to reduce support costs and improve developer productivity across dozens of internal platforms.
This article details how a hidden 100 ms latency in a Spring Boot channel service was identified and resolved by tracing request flow, using the Arthas Java diagnostic tool, and ultimately fixing a Tomcat‑embed bug caused by Swagger‑ui resources.
An in‑depth analysis of a production incident where HttpClient connections accumulated in CLOSE_WAIT, covering symptom identification, TCP state inspection, root‑cause debugging, HttpClient pool internals, and practical configuration tweaks to prevent similar outages.
