Log4j2

Discover how enabling code location in logs can cause severe CPU performance issues in microservices, especially reactive applications. This deep-dive analysis reveals the hidden costs of stack walking in Log4j2 and provides actionable solutions for high-throughput systems.

A deep dive into a mysterious production issue where exception logs mysteriously disappeared, leading us through Arthas debugging, Log4j2 internals, and the discovery that an exception’s getMessage() method was itself throwing exceptions due to Guava-Guice version incompatibility.