Sharding fails under high load during chunk migration

8/10 High

Adding a shard to a MongoDB cluster under heavy load is problematic. MongoDB either migrates chunks so aggressively that it causes DoS conditions on production traffic, or refuses to move chunks at all, making it unsuitable for high-traffic sites with heavy write volumes.

MongoDB
Category
deploy
Workaround
none
Stage
deploy
Freshness
persistent
Scope
single_lib
Recurring
Yes
Buyer Type
enterprise

Sources

Collection History

Query: “What are the most common pain points with MongoDB for developers in 2025?”4/4/2026

MongoDB's sharding doesn't work that well under load. Adding a shard under heavy load is a nightmare. Mongo either moves chunks between shards so quickly it DOSes the production traffic, or refuses to more chunks altogether.

Created: 4/4/2026Updated: 4/4/2026