Sohu Tech Products

Dec 6, 2023 · Operations

Diagnosing Elasticsearch node_concurrent_recoveries Slowness: Root Cause & Fix

A detailed investigation of an Elasticsearch timeout incident reveals how an overly aggressive node_concurrent_recoveries setting caused CPU saturation, disk I/O spikes, and shard relocation overload, and outlines the steps taken to isolate the faulty node and restore cluster performance.