Error
Error Code:
229
MongoDB Error 229: Version Downgrade Required
Description
This error indicates a critical version incompatibility issue within your MongoDB deployment. It typically occurs when a MongoDB instance or component is running a newer software version than what is compatible with the existing replica set, sharded cluster, or data files, requiring a downgrade to proceed.
Error Message
Must Downgrade
Known Causes
3 known causesNewer Binary Joining Older Cluster
An attempt was made to add a new MongoDB instance running a newer binary version to an existing replica set or sharded cluster that is operating on an older protocol or feature compatibility version.
Feature Compatibility Version Mismatch
The feature compatibility version (fCV) of the replica set or sharded cluster does not align with the MongoDB binary version attempting to join or operate, preventing forward progress without a version rollback.
Restoring Newer Data to Older Instance
Attempting to restore a backup or data files that were created by a newer MongoDB version onto an instance running an older, incompatible MongoDB binary.
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