MongoDB Tutorial 0/120 lessons ~6 min read Lesson 84
Failover Handling
When the primary fails, the replica set holds an election.
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Focus
2 guided sections
Practice signal
Examples included
Career prep
Foundation builder
Introduction
When the primary fails, the replica set holds an election. The driver retries the operation against the new primary — clients see at most a few seconds of unavailability.
Best practices
- Use retryable writes (
retryWrites=true, default). - Set sensible
serverSelectionTimeoutMS.
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