Alibaba Cloud Developer

Jul 15, 2025 · Operations

HSF Thread Pool Exhaustion: Uncovering Init Errors and Reactive Stream Crashes

The article analyzes a critical service outage caused by missing initialization checks for a core dependency, leading to uncaught ExceptionInInitializerError, thread pool exhaustion, and unresponsive HSF services, and outlines the investigation steps, root cause, and three concrete remediation actions.