Error
Error Code:
161
MongoDB Error 161: Collation Version Mismatch
Description
This error indicates that the collation settings specified for an operation or data are incompatible with the MongoDB server's capabilities or the target collection/index. It typically occurs when there's a mismatch in collation versions between client requests, existing data, or server versions, often after upgrades or migrations.
Error Message
Incompatible Collation Version
Known Causes
4 known causesMongoDB Version Incompatibility
A client or application is attempting to use a collation version that is not supported by the current MongoDB server version.
Data Migration or Upgrade Issues
Data or indexes created with a specific collation version on an older MongoDB instance are being used on a newer instance that expects a different version, or vice-versa.
Incorrect Collation Specification
The application or client driver is explicitly requesting a collation version that the MongoDB server does not recognize or support for the current operation.
Mixed Collation Versions in Cluster
Different nodes or shards in a sharded cluster are running varying MongoDB versions, leading to collation version inconsistencies across the deployment.
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