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MongoDB Manual

Replica Set High Availability

Replica sets use elections to support high availability.

Replica Set Elections
Elections occur when the primary becomes unavailable and the replica set members autonomously select a new primary.
Rollbacks During Replica Set Failover
A rollback reverts write operations on a former primary when the member rejoins the replica set after a failover.


Replica Sets Distributed Across Two or More Data Centers


Replica Set Elections