Practicing data-driven principles and believing technology can change the world.
An online service experienced frequent Full GC due to a ThreadLocal memory leak in a thread‑pool scenario; the article walks through GC log analysis, heap dump inspection, root‑cause discovery in ThreadFactory logic, and presents a robust fix using Spring’s TaskDecorator to ensure proper cleanup.
Facing mysterious minute‑level data rollbacks caused by Impala's metadata cache, a team migrated from a T+1 Hive‑Impala stack to Apache Doris, achieving real‑time consistency, higher performance, simplified ETL, and reduced operational complexity across their points‑based loyalty system.
Upgrading a company's Java stack from JDK 11 to JDK 21, while staying on Spring Boot 2.7.18, provides long‑term security support, leverages virtual threads, new low‑latency garbage collectors, modern language features like records and pattern‑matching, and avoids costly Jakarta EE namespace migration, with detailed steps for pom changes, MongoDB configuration, code adjustments, and post‑upgrade validation.
This article walks through the complete process of designing and implementing a secure, stable, and easy‑to‑use Android third‑party payment SDK, covering project background, technical challenges, layered architecture, core components, security mechanisms, memory management, UI design, performance optimizations, testing strategies, monitoring, and future roadmap.
This article introduces Apple’s Foundation Models framework, explaining its core features, system requirements, and step‑by‑step Swift code for importing the framework, checking model availability, creating sessions, handling generation options, guided output, tool calling, streaming responses, and maintaining conversational context for privacy‑preserving on‑device AI.
This article explains HarmonyOS concurrency concepts, covering async patterns with Promise and async/await, the Actor model for multithreading, and practical usage of TaskPool, Worker, and the @Concurrent decorator with code examples to improve app responsiveness and performance.
This guide explains why upgrading from Spring Boot 1.5 to 2.1 is essential for MongoDB transaction management, outlines version requirements, highlights key feature changes, and provides step‑by‑step instructions with code examples to enable reliable transactional operations in a Spring‑based backend.
This article explains why high‑availability design and comprehensive monitoring are essential for modern big‑data platforms, outlines a layered architecture, and provides practical guidance on health checks, alerting, and data‑quality monitoring across storage, compute, scheduling, and service layers.
This article walks through a real‑world Kubernetes incident where a node’s disk usage exceeded the eviction threshold, causing pods to enter the Evicted state, and details the investigation steps, root‑cause analysis, and practical remediation actions.
This guide explains how to use Postman's pre‑request and test scripts to automate request signing, switch between multiple environments, and handle JWT‑based authentication, providing step‑by‑step instructions, execution order details, and practical code snippets.
