Answer
The balancer monitors shard chunk distribution via config servers and migrates chunks when imbalance thresholds are exceeded.
Quick Answer
The balancer triggers migration when the chunk count difference between the most and least loaded shards exceeds a threshold (varies by total chunk count). It migrates chunks from the most loaded to least loaded shards until balanced. Balancing uses collection-level locks during certain migration phases. Schedule balancing windows (balancerStart/Stop) to avoid peak traffic hours.
S
SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ