For AI agents: a documentation index is available at https://www.mongodb.com/docs/llms.txt — markdown versions of all pages are available by appending .md to any URL path.

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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.

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