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Xianyu Technology
Xianyu Technology
Jun 2, 2020 · Backend Development

Diagnosing and Resolving Random JVM Hang Issues in a High-Concurrency Application

The article outlines a six‑step method for diagnosing sporadic JVM hangs in a high‑concurrency Xianyu service—starting with code review, live state capture, I/O checks, lock analysis, resource‑exhaustion assessment, and finally framework thread‑pool tuning—to uncover lost‑lock behavior and severe thread‑pool imbalance that cause prolonged lock waits despite low CPU load.

JVMThread Dumpdebugging
0 likes · 12 min read
Diagnosing and Resolving Random JVM Hang Issues in a High-Concurrency Application
Youzan Coder
Youzan Coder
Jan 25, 2019 · Databases

Analyzing MySQL Deadlock Logs: A Step-by-Step Guide

The guide walks through creating a sample InnoDB table, reproducing a delete‑vs‑insert deadlock, and dissecting the SHOW ENGINE INNODB STATUS output to explain lock modes such as X, S, GAP and INSERT‑INTENTION, showing how one transaction’s IX lock and another’s X lock on the same index create a classic deadlock and why understanding these modes is crucial for diagnosis.

InnoDBMySQLdatabase
0 likes · 8 min read
Analyzing MySQL Deadlock Logs: A Step-by-Step Guide