Blog
Technical exploration and thoughts · 655 articles
Guava Cache: From ConcurrentHashMap to LocalCache Structure
Deep dive into LocalCache, Guava Cache's core implementation class, covering segmented lock design, five queue mechanism, eviction strategy and lazy cleanup principles.
Cache Practice: Local vs Distributed (Guava/Redis 7.2)
High concurrency read-heavy business, database can't handle it, need to improve throughput and stability. Local cache for ultimate read performance, distributed cache for sharing and scaling, multi...
AI Research #135: Gemini 3 Pro Back on Top - MoE, Million...
Explains Gemini 3 Pro's advantages through sparse MoE architecture, million-token context, native multimodal (text/image/video/PDF), thinking depth control (thinking_level), and Deep Think mode. St...
OSS Access Control: ACL/RAM/Bucket Policy and Troubleshoo...
For multi-team and cross-account collaboration, OSS needs public access, least privilege, and auditability. Use RAM Policy for identity, Bucket Policy for source and resource constraints, and ACL o...
AI Research #134: Java 2025 - Will It Decline?
In 2025, Java remains the enterprise backend and critical industry workhorse. Key keywords: Java 25 LTS, Java 21 LTS, Spring Boot, MicroProfile, Kubernetes, Serverless, Project Loom, GraalVM Native...
OSS Practice Guide: Bucket/External Links/Hotlink Protection
Enterprises and individuals migrating images/audio/video/static resources to Aliyun OSS need stable operations and cost control. Configure precisely by region and permissions, combine hotlink prote...
AI Research #133: Java vs Kotlin/Go/Rust/Python/Node 2025
Comprehensive comparison of Java 21/23 (Virtual Threads/Loom) with Kotlin 2.x, Go 1.22/1.23, Rust 1.7x, Python (PyTorch 2.x/TensorFlow 2.x), Node.js 20/22. Covers ecosystem, performance, and applic...
Java Integration with FastDFS: Client and Maven/Spring Boot
Two ways for Java applications to integrate with FastDFS: official source compilation (happyfish100/fastdfs-client-java 1.37-SNAPSHOT) and Maven dependency (cn.bestwu / com.github.tobato).
AI Research #132: Java Ecosystem 2025 - Spring, Quarkus, ...
Spring Framework 6, Spring Boot 3.x (minimum JDK 17, supports Java 21 Virtual Threads), GraalVM Native Image AOT, Quarkus and Micronaut cloud-native...
FastDFS High Concurrency Optimization: max_connections, T...
Optimization for high concurrency/massive small files with single disk or RAID: upgrade to v5.04+, configure threads based on CPU cores, reduce directory levels, adjust sync parameters based on lat...
AI Research #131: Java 17/21/25 Complete Comparison
Java 17 (2021), Java 21 (2023), Java 25 (2025) language and JVM changes, covering Virtual Threads (Project Loom), Records/Pattern Matching (Project Amber),...
FastDFS Cluster Practice: 3-Node Tracker/Storage + Nginx
Deploy tracker, storage, and Nginx on three hosts with round-robin upload. Key points: Nginx+mod_fastdfs routing and monitoring verification. Output: reusable cluster config checklist + version mat...
AI Research #130: Qwen2.5-Omni Practical Applications
Office assistant, education and training, programming and operations, search-enhanced RAG, device control/plugin agents, and companion entertainment. Covers...
AI Research #129: Qwen2.5-Omni-7B Key Specs - VRAM, Conte...
Runs stably at FP16 ~14GB VRAM, with INT8/INT4 quantization (<4GB) enabling deployment on consumer GPUs or edge devices. Combined with FlashAttention 2 and...
AI Research #128: Qwen2.5-Omni Training Pipeline - Three-...
Complete training pipeline breakdown for Qwen2.5-Omni: Thinker based on Qwen2.5, vision initialized from Qwen2.5-VL, audio from Whisper-large-v3. Uses...
AI Research #127: Qwen2.5-Omni Deep Dive - Thinker-Talker...
Engineering breakdown of Qwen2.5-Omni (2024-2025) Thinker-Talker dual-core architecture: unified Transformer decoder for text/image/video/audio fusion, TMRoPE...
AI Research #126: Tesla FSD V14 Engineering - High-Precis...
Tesla FSD V14 related US patents: engineering analysis of high-precision vision occupancy network (SDF ~10cm), sparse sampling + trilinear interpolation,...
AI Research #125: Tesla FSD Business Model and Competitor...
FSD V14 (2025) business model and competitive landscape. Analyzes pricing logic for one-time purchase (~15,000) vs subscription (~199/month) and deferred...
AI Research #124: Tesla FSD V14 Deep Analysis
Tesla FSD V14 real-world performance and road tests, comparing V13.2 on urban roads and highways: key disengagement metrics, lane changes/ramps, destination arrival, and long-tail scenarios. V14 sh...
AI Research #123: FSD V14 Deep Analysis - Vision-Only SDF...
FSD V14 (2025) technical evolution compared to V12 (2023), focusing on vision-only approach, SDF (Signed Distance Field) occupancy reconstruction, end-to-end...