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Type: Task
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Resolution: Done
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Priority: Critical - P2
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Affects Version/s: None
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Component/s: manual
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Labels:None
When you have a lot of sharded collections perfectly balanced across X shards, adding a new shard will cause all existing collections to rebalance across X+1 shards, which might take some time.
I suggest to put a note about this in our docs, as some users apparently expect mongoS to only rebalance newly sharded collections.