dbaplus Community
Jun 16, 2020 · Databases
Why MongoDB 4.0 Increases CPU Load After Upgrade – Balancer and moveChunk Explained
After upgrading a three‑shard MongoDB cluster from version 3.2 to 4.0, CPU usage jumped from 10 % to 40 % due to more frequent moveChunk operations and the resulting delete workload, as the balancer’s imbalance thresholds changed between versions.
BalancerMongoDBmoveChunk
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