Question

Point out the wrong statement.

(a) When the primary rejoins the set as a secondary, it reverts, or “rolls back,” its write operations to maintain database consistency with the other members

(b) A rollback is necessary only if the primary had accepted write operations that the secondaries had not successfully replicated before the primary stepped down

(c) MongoDB attempts for rollbacks, which should be rare

(d) None of the mentioned

I got this question in an internship interview.

My query is from Replica Set High Availability in division Replication Concepts, Processes and Replication Set of MongoDB

Answer 1

The correct answer is (c) MongoDB attempts for rollbacks, which should be rare

To elaborate: When a rollback does occur, it is often the result of a network partition.