Reasons behind Failed Events in a Pipeline

The failures can occur due to different reasons (Check Introduction to Failed Events in a Pipeline for more info).

Below is an exhaustive list of reasons due to which events may fail:

  • Data type mismatch for the field: Occurs when we encounter a field whose expected and actual data types don’t match. e.g. A 64 Bit Integer value for a 32 Bit Integer field, or a String value for Boolean field.
  • Data validation failed for a field: Occurs when a value fails to validate a field’s constraints. e.g. A null value in a non-nullable field, or a String with 256 characters in a char(128) field.
  • Could not determine the data type for the field: Occurs when we are unable to identify the data type for a field. This should rarely happen.
  • Transformation Code error: Occurs when the transformation code throws an error.
  • Found unmapped event type: Occurs when an event type is not mapped to a destination table.
  • Found unmapped fields: Occurs when a field in an event type is not mapped to a column in a destination table. To fix this error, you can uncheck such fields (to skip them) or map them to columns through the Schema Mapper.
  • Fields not found in destination table: Occurs when one or more destination columns specified in Schema Mapper are not physically present in the destination table. To fix this error, you can create these columns in your destination table or unmap the fields in the Schema Mapper.
  • Table doesn’t exist: Occurs when a destination table specified in the Schema Mapper is not physically present in the destination. To fix this error, you can create this table in your destination or unmap the table in Schema Mapper.
  • No values provided for non-null columns: Occurs when we encounter null values for non-null columns in a destination table.
  • No partition key found for event type: Occurs when no partition key(s) are configured for an event type in file-based destinations (e.g. S3).

If you encounter issues other than the ones listed above, reach out to our support and they will happily help you out.