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Type: Improvement
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Resolution: Won't Fix
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Priority: Minor - P4
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Affects Version/s: None
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Labels:None
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Environment:sharding with replica sets
Regarding sharding metadata in this document section:
http://docs.mongodb.org/manual/core/sharded-cluster-config-servers/#read-and-write-operations-on-config-servers
It may be helpful to state that in a sharded cluster, the primary members of replica sets cache sharding metadata too, along with mongos.
This may help operations staff, for example, when they are migrating or replacing config servers.