Details
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Improvement
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Resolution: Done
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Critical - P2
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None
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None
Description
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.