topic Re: Fabric Data Factory pipeline Copy activity failed: file upload operation unsuccessful. in Pipelines

Fabric Data Factory pipeline Copy activity failed: file upload operation unsuccessful.

surajpardeshi — Tue, 15 Jul 2025 07:54:16 GMT

Hi,

I'm attempting to copy 12 tables (~45 GB each) from Azure Data Warehouse to Fabric Warehouse using a Fabric Data Factory pipeline. While half of the tables copied successfully, the others failed with the error below.

Could anyone advise on how to resolve this issue?

Failure happened on 'Source' side. ErrorCode=UserErrorWriteFailedFileOperation,'Type=Microsoft.DataTransfer.Common.Shared.HybridDeliveryException,Message=The file operation is failed, upload file failed at path: '04a7ee3e-0f3b-4f88-8199-e4872765be53/_system/services/DI/pipelines/d926d236-d241-4aad-95b7-280e97ec9d75/MSSQLImportCommand/data_d926d236-d241-4aad-95b7-280e97ec9d75_fcbc106f-8ec5-4b74-a251-84fe447209a0.parquet'.,Source=Microsoft.DataTransfer.Common,''Type=System.Data.SqlClient.SqlException,Message=111251; An unexpected error occurred while processing results, retry the operation. This may have occurred due to node connection loss. Results, if any, should be discarded.,Source=.Net SqlClient Data Provider,SqlErrorNumber=111251,Class=16,ErrorCode=-2146232060,State=1,Errors=[{Class=16,Number=111251,State=1,Message=111251; An unexpected error occurred while processing results, retry the operation. This may have occurred due to node connection loss. Results, if any, should be discarded.,},],'

Re: Fabric Data Factory pipeline Copy activity failed: file upload operation unsuccessful.

BhaveshPatel — Sat, 19 Jul 2025 08:32:59 GMT

In that case, You should understand difference between Windows and Linux Operating System & Kubernetes. Now coming to the point, You should use Fabric Dataflow Gen 2 to transfer files from Azure Datawarehouse to Fabric Warehouse/Lakehouse( Both are same ). You can easily do that.

Re: Fabric Data Factory pipeline Copy activity failed: file upload operation unsuccessful.

v-prasare — Mon, 21 Jul 2025 12:42:04 GMT

Hi surajpardeshi,

We would like to follow up to see if the solution provided by the community member resolved your issue. Please let us know if you need any further assistance.

BhaveshPatel, thanks for your prompt response.

Thanks,

Prashanth Are

MS Fabric community support

If our super user response resolved your issue, please mark it as "Accept as solution" and click "Yes" if you found it helpful.

Re: Fabric Data Factory pipeline Copy activity failed: file upload operation unsuccessful.

v-prasare — Thu, 24 Jul 2025 16:48:18 GMT

Hi surajpardeshi,

We would like to follow up to see if your query got resolved? Please let us know if you need any further assistance.

Thanks,

Prashanth Are

MS Fabric community support

Re: Fabric Data Factory pipeline Copy activity failed: file upload operation unsuccessful.

v-prasare — Wed, 06 Aug 2025 09:22:46 GMT

We would like to confirm if our community members answer resolves your query or if you need further help. If you still have any questions or need more support, please feel free to let us know. We are happy to help you.

If we don’t hear back, we’ll go ahead and close this thread. For any further discussions or questions, please start a new thread in the Microsoft Fabric Community Forum we’ll be happy to assist.
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