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lesbs's avatar
lesbs
New Member
6 months ago

Databricks ADBC Driver problems after new update

Hi We wanted to start using the ADBC Driver for performance but are getting this error after the latest Power BI Jan 2026 update. 
What is the recommended action? 

Next to this we noticed big problems with fetching data, posting and running the query from power bi to databricks works fine, after our serverless unit takes hours to fetch the results and send them back to the power bi service, in the end ending up in a timeout error. 

Not sure if the two are related.

 

Thanx for the help

Need Help

13 Replies

  • sergej_og's avatar
    sergej_og
    Super User
    6 months ago

    Same here.
    Just figured out by setting this option connection works again

     

    • lesbs's avatar
      lesbs
      New Member
      6 months ago

      Yes true found that as well, but that basically sets it back to the ODBC driver. Im not sure if this is a bug to report to Microsoft or to Databricks

      • sergej_og's avatar
        sergej_og
        Super User
        6 months ago

        Yes, I assume it's a bug to be reported.
        With version of Nov 2025 everything was fine

  • Toussaint9's avatar
    Toussaint9
    New Member
    6 months ago

    The root cause of this issue (timeout failures during refresh operations) has been identified and will be resolved in the upcoming Power BI release.

     

    As a short term workaround customers can add the MaxNumResultFileDownloadThreads="1" parameter to their Power BI M-code connection string (or rollback to ODBC).

    Example M-code: let Source = Databricks.Catalogs( "your-server.azuredatabricks.net", "/sql/1.0/warehouses/your-warehouse-id", [ Implementation="2.0", MaxNumResultFileDownloadThreads="1" ] ),

    • pinar1's avatar
      pinar1
      Frequent Visitor
      6 months ago

      Thank you for the reply, I tried this. However the refresh / refresh preview in the Power Query is lasting forever after I did what you suggested. Is this normal? Anyone having the same problem?