MySQL to ClickHouse: Scaling a Student Fitness Platform
A student fitness platform evolves from MySQL writes to ClickHouse analytics with bounded imports, outbox delivery, and query-oriented views.
Category Java & JVM
Java Heap OOM with Arthas: Find Retained Data Before Raising -Xmx
A reproducible Arthas workflow for Java heap OOMs: identify retained objects, connect them to an import path, and verify chunked processing with memory checks.
Java Performance: Remove Repeated Searches and Unnecessary Work
Reduce repeated searches, unnecessary sorting, eager fallback calls, and excess memory retention, then verify changes with correctness tests, JFR, and JMH.
Java Transactions: Orders, Stock, and Outbox Events
A practical Spring and MySQL order workflow: define transaction boundaries, reserve stock safely, deduplicate retries, and deliver committed events through an outbox.