DeltaNotSupportedAction - Fabric Lakehouse

HI Kanna123 

Thank you for reaching out to the Microsoft Fabric Community Forum.

The solution provided by nilendraFabric is accurate. Additionally, here are a few more points that may be helpful.

The error occurs because the Delta log file contains actions not supported by the Delta Lake implementation.

These could include:

• Corrupted entries caused by interrupted operations .
• Concurrent updates that cause conflicting log entries.
• Invalid or unsupported schema updates during data write.
• Unexpected file states in the storage layer.

1. Check the Delta Log Files

• Inspect the Delta log files (_delta_log directory) to identify the unsupported action causing the issue.

2. Identify the Source of the Unsupported Action

• Ensure that the source data or transformation logic is not introducing unsupported actions into the Delta log.

3. Validate the Data Ingestion Process

• Review the data ingestion pipeline or job that writes to the Delta table.
• Ensure that the pipeline uses a compatible version of Delta Lake and that the operations being performed are supported.

4. Check for Delta Lake Version Compatibility

• Ensure that the version of Delta Lake being used is compatible with the actions being performed. If you are using an older version of Delta Lake, consider upgrading to the latest version, as newer versions may support additional actions or have bug fixes.

If my response has resolved your query, please mark it as the Accepted Solution to help others. Additionally, I would appreciate a 'Kudos' if you found my response helpful.

Thank you!