Error
Error Code:
92
MongoDB Error 92: Unexpected Secondary State
Description
MongoDB Error 92, 'Secondary Ahead Of Primary', indicates a critical replication inconsistency within a replica set. This error occurs when a secondary member's oplog contains operations that are not present in the primary's oplog, meaning the secondary has diverged and is considered to be 'ahead' of the primary. This state is highly problematic for data integrity and can prevent proper replication.
Error Message
Secondary Ahead Of Primary
Known Causes
3 known causesManual Data Divergence
Direct, unsynchronized writes or administrative operations performed on a secondary member can cause its oplog to contain entries not originating from the primary.
Replica Set Configuration Anomalies
Errors during replica set reconfigurations, such as a member rejoining with an incorrect history or an improperly restored backup, can lead to this inconsistent state.
Data Corruption or Disk Issues
Underlying data corruption on a secondary's disk or unexpected file system behavior could result in an oplog that appears to be ahead of the primary.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service