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NetEase Game Operations Platform
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
0 likes · 13 min read
Analysis of MongoDB 3.2 vs 4.0 Balancer and moveChunk Impact on CPU Load
Aikesheng Open Source Community
Aikesheng Open Source Community
Jul 29, 2019 · Databases

Analysis and Resolution of MongoDB Sharding Balancer Chunk Migration Failures in Version 3.4.x

A MongoDB client reported severe chunk imbalance and nightly balancer migration failures in a sharded cluster, which were traced to a known bug causing conflicting operations, and the issue was resolved by disabling the balancer for the affected collection and upgrading the cluster to version 3.4.11 or later.

BalancerChunk MigrationDatabase Bug
0 likes · 6 min read
Analysis and Resolution of MongoDB Sharding Balancer Chunk Migration Failures in Version 3.4.x