Error
Error Code:
212
MongoDB Error 212: Incompatible Rollback Algorithm
Description
This error indicates that MongoDB replica set members have incompatible internal rollback algorithms, preventing successful data consistency operations during failovers or state transitions. It typically occurs when members cannot agree on how to revert transactions, which is crucial for maintaining data integrity.
Error Message
Incompatible Rollback Algorithm
Known Causes
4 known causesMixed MongoDB Versions
Different MongoDB versions running within the same replica set can have varying internal rollback algorithm implementations.
Inconsistent Internal State
A replica set member might be in an inconsistent internal state due to unexpected shutdowns or underlying system issues, leading to an incompatible rollback algorithm.
Partial Upgrade/Downgrade
An incomplete or failed upgrade or downgrade process can leave some replica set members with an outdated or incompatible rollback algorithm.
Manual Configuration Overrides
Unintended or unsupported manual configuration changes on specific replica set members that alter internal replica set protocols.
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