Having issue while streaming data from event hub into databricks using managed identity process

Hi Kallu, Srinath,

Thanks for reaching out to Microsoft Q&A.

The error message indicates that your Databricks notebook is unable to auth with the Azure Event Hub using the Managed Identity.

Here are the potential reasons and troubleshooting steps to resolve this issue:

Verify Managed Identity Setup

• Ensure that a MI (System-Assigned/User-Assigned) is enabled for your Azure Databricks cluster or workspace.
• Confirm that this MI has the required permissions on the Event Hub (ex: Azure Event Hubs Data Receiver).

Assign Necessary Role to Managed Identity

• In the Azure Portal:
  1. Navigate to the Event Hub namespace or specific Event Hub instance.
  2. Go to Access Control (IAM) and add the Azure Event Hubs Data Receiver role to the Managed Identity of the Databricks workspace.

Use the Correct Azure Library in Databricks

• Make sure you are using the azure-eventhub and azure-identity libraries in Databricks for Managed Identity authentication. Example installation command: %pip install azure-eventhub azure-identity

Update the Event Hub Consumer Code

• Your Python code should use DefaultAzureCredential to authenticate with the Event Hub using the Managed Identity. Here's an example:

    from azure.identity import DefaultAzureCredential
    from azure.eventhub import EventHubConsumerClient
    # Replace with your Event Hub details
    event_hub_namespace = "Your-EventHub-Namespace.servicebus.windows.net"
    event_hub_name = "Your-EventHub-Name"
    consumer_group = "$Default"
    # Use Managed Identity for authentication
    credential = DefaultAzureCredential()
    client = EventHubConsumerClient(
        fully_qualified_namespace=event_hub_namespace,
        eventhub_name=event_hub_name,
        consumer_group=consumer_group,
        credential=credential
    )
    def on_event(partition_context, event):
        print("Received event: {}".format(event.body_as_str()))
        partition_context.update_checkpoint(event)
    with client:
        client.receive(on_event=on_event)
    
    
  

Verify Networking Setup

• If your Event Hub namespace uses Private Link or is behind a virtual network, ensure the Databricks cluster has access to it.
• You may need to configure VNet peering or allow the Managed Identity traffic.

Check Diagnostic Logs

• Enable diagnostic logs for your Event Hub to get more details about failed authentication attempts. Navigate to Monitoring > Diagnostics settings in the Event Hub and configure logging to a Log Analytics workspace or Storage account.

Debugging Steps

• Test Managed Identity access separately using a simple Python script outside of Databricks.
• Check if there are any network restrictions or IP firewalls blocking access.

Additional Considerations:

If you continue to face the issue, verify that:

• The Azure SDK versions are up to date.
• The Event Hub namespace and resource name match exactly in the code.
• No other conflicting roles or policies are impacting the MI.

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@Kallu, Srinath

Welcome to the Microsoft Q&A and thank you for posting your questions here.

The error message you're encountering indicates an authentication failure with a 401 status code, which typically means "Unauthorized Access." Here are some additional steps to troubleshoot this issue:

• Double-check that the Managed Identity assigned to your Databricks workspace has the "Azure Event Hubs Data Receiver" role at the correct scope (Event Hub namespace or specific Event Hub instance).
• Ensure that the Event Hub namespace is correctly configured for Azure Active Directory (AAD) authentication.
• Make sure you are using the latest versions of the azure-eventhub and azure-identity libraries. You can update them using:

    %pip install --upgrade azure-eventhub azure-identity
    
  

• Verify that the fully_qualified_namespace and eventhub_name in your code match exactly with your Event Hub namespace and Event Hub name.
• Enable diagnostic logs for your Event Hub to capture more details about the failed authentication attempts. This can provide insights into why the authentication is failing.

I hope the above steps will resolve the issue, please do let us know if issue persists. Thank you