Question
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
Posted under Replication in MongoDB MongoDB
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