Answer
Config servers maintain chunk metadata; mongos routes queries based on metadata, and majority write concern ensures cluster-wide consistent writes.
Quick Answer
In a sharded cluster, consistency per shard is handled by each shard's replica set. Cross-shard consistency: single-document operations on one shard are always atomic. Multi-document cross-shard transactions use a two-phase commit protocol via the transaction coordinator. For non-transactional operations across shards, you get per-shard consistency but no global atomicity.
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Verified Answer
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Source: SugharaIQ