Aikesheng Open Source Community

Jun 13, 2022 · Databases

Diagnosing Uneven Load in a MongoDB Sharded Cluster Using ExecutionStats

The article recounts a performance incident on a MongoDB 4.2 sharded cluster where one shard’s CPU spiked to 100% during a mail‑sending test, describes the diagnostic steps using monitoring data, slow‑query logs, and executionStats, and concludes with the root cause and remediation.