NetEase Game Operations Platform
Mar 28, 2020 · Databases
Analysis of MongoDB 3.2 vs 4.0 Balancer and moveChunk Impact on CPU Load
The article examines why upgrading a three‑shard MongoDB cluster from version 3.2 to 4.0 causes CPU usage to jump from 10 % to 40 %, attributing the increase to more frequent moveChunk operations and the associated deletion workload, and explains the underlying balancer threshold differences between the versions.
BalancerCPU LoadMongoDB
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