Error
Error Code:
34
MongoDB Error 34: Cannot Backfill Array Data
Description
This error indicates that a MongoDB secondary replica set member is unable to synchronize array data from the primary during the backfill process. It typically occurs when there are inconsistencies in how array fields are structured or handled across replica set members, preventing successful data replication.
Error Message
Cannot Backfill Array
Known Causes
3 known causesInconsistent Array Schema Changes
Structural modifications to array fields on the primary that are not compatible with how the secondary attempts to backfill the data.
Corrupted or Unexpected Array Data
Array data on the primary that is malformed or in an unexpected format, causing the secondary to fail during synchronization.
MongoDB Version Incompatibilities
Mismatched MongoDB versions between replica set members that handle array data or the backfill process differently.
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