Troubleshooting File Copy Failures to Azure Blob Storage

Question

What could be causing certain data files to fail to copy to Azure Blob Storage while other files copy without issues?

PS - Based on common issues that we have seen from customers and other sources, we are posting these questions to help the Azure community.

Answer 1

Greetings!

The problem of certain data files failing to copy to Azure Blob Storage, while others copy successfully, is likely due to the length of the file names. Specifically, if the file names exceed the 256-character limit imposed by Azure Blob Storage, the files may not copy.

To address this issue, follow these steps:

1. Verify File Name Length: Ensure that the file names of the problematic files do not exceed 256 characters.
2. Modify File Names: If the file names are too long, shorten them and try copying the files again.
3. Test the Changes: Copy the files with the modified names to confirm that the issue has been resolved.
4. Consult Documentation: Refer to the relevant Azure documentation to understand the constraints on file and path lengths and follow best practices.

Resources:

• Maximum File Path Limitation
• Naming and Referencing Containers, Blobs, and Metadata

Hope this helps. If you have any follow-up questions, please let me know. I would be happy to help.

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