Capturing thoughts and reflections while coding.
This article walks through implementing a lightweight single‑machine MapReduce framework inspired by the original MapReduce paper, covering the abstract Map/Reduce model, task scheduling between master and workers, core Go code for map, reduce, worker, and coordinator, and a brief reflection on its limitations.
The MIT 6.824 course offers rich video resources, low entry difficulty, and well‑structured labs covering MapReduce, Raft, a simple KV store, and sharding, while the author shares personal challenges and tips for tackling the coursework.
This article explains why MySQL deadlocks occur in a test module, details table and row lock mechanisms, reproduces the deadlock scenario with two sessions, analyzes lock logs, and provides a solution by adding a composite index to prevent the conflict.
This article walks through three typical interview coding rounds—implementing a robust string‑to‑int parser, designing a high‑concurrency trace‑storage API, and building a matrix multiplication routine with performance and sparse‑matrix optimizations—providing code examples, corner‑case handling, and improvement ideas.
This article explains how C++ compilers implement virtual functions using a hidden vptr and virtual table, showing how class size grows from 1 to 8 bytes, detailing memory layouts for single, multiple, and diamond inheritance, and providing commands to dump vtable and layout information.
This guide explains how multipart/form-data enables sending JSON and binary data together, outlines its essential specifications, demonstrates front‑end FormData usage, and details Spring Boot back‑end handling with @RequestParam and @RequestPart annotations.
Learn how to create a Sonatype account, configure Maven POM metadata, add source and Javadoc jars, sign artifacts with GPG, set up Gradle publishing plugins, and deploy both SNAPSHOT and RELEASE versions to Sonatype’s OSS repository using Gradle 6.2.
This guide explores advanced MySQL techniques—including ON DUPLICATE KEY UPDATE for upserts, INSERT IGNORE to bypass errors, replacing subqueries with JOINs, handling LEFT JOIN pitfalls, efficient pagination strategies, multi‑table UPDATE/DELETE via JOIN, and the nuances of COUNT(*) versus COUNT(1).
This guide explains how to configure JVM options to capture GC logs, use GCViewer to interpret Parallel, G1, and CMS collector logs, decode each log field, and apply concrete tuning parameters to improve pause times and overall application throughput.
This article explains the seven Java garbage collectors available up to JDK 1.8, compares their strengths and weaknesses, and shows how to select and tune the appropriate collector—Serial, Parallel, CMS, or G1—based on application characteristics and deployment environments.
