The sharding balancer does not consult the optimal per shard chunk count when deciding to move chunks out of a shard and because of this causes chunks to move from shards with below-average number of entries to even less loaded shards, thus causing unnecessary churn.
- related to
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SERVER-25652 Slow chunk migrations when there are large chunk counts. 3.0, 3.2, 3.3.11
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- Closed
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