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A ______ member maintains a copy of the primary’s data set but is invisible to client applications.

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A ______ member maintains a copy of the primary’s data set but is invisible to client applications.

(a) primary

(b) delayed

(c) hidden

(d) none of the mentioned

The question was posed to me during an interview for a job.

This interesting question is from Read and Write Semantics topic in division Replication Concepts, Processes and Replication Set of MongoDB

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Best answer
Right choice is (c) hidden

To elaborate: Hidden members are good for workloads with different usage patterns from the other members in the replica set.

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