Upload file report error “Unable to retrieve column specifications“

[tangxiancong]

Hello all, (apologies if I'm posting in the wrong place)

I wanted to upload csv files to big query ,format as below screenshot ,but I am running into a parse error: “Unable to retrieve column specifications  Please make sure Gcs file gs://example20231211/training _data_V111.csv is valid . I believe that I have it in the correct format but I am not sure what the issue is. Has anyone run into this issue?

[ms4446]

There are several potential reasons for this issue:

1. CSV File Integrity: Ensure the CSV file is not corrupt and adheres to the standard format. Each line should represent a single record with fields separated by commas, and there should be no blank lines or extraneous characters at the beginning or end of the file.

2. Header Row Format: BigQuery expects the first line of the CSV file to be a header row with column names. Ensure the header row is formatted correctly. While backticks (`) are not typically required in CSV headers, ensure that any special characters or commas within column names are appropriately handled.

3. Schema Compatibility: The schema of the CSV file must match the schema of the BigQuery table you're uploading to. Check that the data types and column order in the CSV file align with those in the BigQuery table.

4. Permissions: Verify that you have the necessary permissions to upload files to the Cloud Storage bucket where your CSV file is located.

5. Encoding: The CSV file should be UTF-8 encoded, as this is the preferred encoding for BigQuery.

6. Special Characters and Quoting: If your CSV contains special characters or commas within fields, ensure these fields are correctly enclosed in double quotes.

7. File Size and Limits: Check if the file size and the number of columns are within BigQuery's allowed limits.

8. Manual Schema Definition: Consider manually defining the schema during the upload process if BigQuery is misinterpreting the data types.

9. Testing with a Subset: Try uploading a smaller subset of your data to identify specific rows or formats causing issues.

10. BigQuery Job Logs: Review the detailed error messages in BigQuery's job logs for more specific insights.

Troubleshooting Tips:

• Inspect the Cloud Storage bucket for any upload-related errors.
• Download and open the CSV file in a text editor to check for formatting errors.
• Use the bq load command with the --dry_run=true flag to test the CSV file's schema without uploading the data.
• If the problem persists, consider reaching out to Google Cloud support for further assistance.

By following these steps, you should be able to identify and resolve the issue with your CSV file upload to BigQuery.