Error
Error Code:
124
MongoDB Error 124: Incompatible Election Protocol
Description
Error 124, 'Incompatible Election Protocol', indicates that members within a MongoDB replica set are attempting to communicate using different or unrecognized election protocols. This critical issue prevents a primary from being elected and can halt replica set operations.
Error Message
Incompatible Election Protocol
Known Causes
3 known causesMixed MongoDB Versions
Replica set members are running different major or minor versions of MongoDB, leading to a mismatch in their election protocol implementations.
Inconsistent Protocol Version
The `replicaSetProtocolVersion` setting in the replica set configuration is not uniform across all members, causing communication failures during elections.
Incomplete Upgrade Procedure
A replica set upgrade was not fully completed, leaving some members on an older election protocol version while others are on a newer one.
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