Share via

trying to send data from event hub to blob storage via function app

Vipul 0 Reputation points
2024-09-16T08:41:27.33+00:00

Subject: Issue with Epoch Receivers While Streaming Data from Event Hub to Blob Storage via Azure Function Hi Azure Support, I am experiencing an issue with my Azure Function that is triggered by an Event Hub and streams data to Blob Storage. Specifically, I am encountering the following error in the Event Hub logs:

"ErrorMessage": "at least one receiver for the endpoint is created with epoch of '0', and so non-epoch receiver is not allowed. either reconnect with a higher epoch, or make sure all epoch receivers are closed or disconnected."

Event Hub and Azure Function Logs:

  • I see the following repeated errors in my Azure Function logs:

2024-09-16T08:14:39Z   [Information]   Executing 'Functions.EventHubTrigger1' (Reason='(null)', Id=59ac551e-b840-4d1a-b9ca-3926edd70b5e) 2024-09-16T08:14:39Z   [Information]   Trigger Details: PartitionId: 0, Offset: 73034799792-73034799792, EnqueueTimeUtc: 2024-09-16T08:14:39.0470000+00:00, SequenceNumber: 2265-2265, Count: 1 2024-09-16T08:14:39Z   [Error]   Executed 'Functions.EventHubTrigger1' (Failed, Id=59ac551e-b840-4d1a-b9ca-3926edd70b5e, Duration=15ms)

This error repeats across multiple partitions, with each function execution failing. ### Troubleshooting Steps Taken: I have attempted to close all epoch receivers with the following code, ensuring that any existing connections with epoch 0 are closed before reconnecting with a higher epoch value (1):

python from azure.eventhub import EventHubConsumerClient # Function to close existing receivers def close_existing_receivers(client):     try:         client.close()         print("All epoch receivers closed successfully.")     except Exception as e:         print(f"Failed to close receivers: {str(e)}") # Set up the Event Hub client consumer_client = EventHubConsumerClient.from_connection_string(     conn_str="Endpoint=sb://c-44-namespace.servicebus.windows.net/;SharedAccessKeyName=c44finalpolicy;SharedAccessKey=TRgyphdkiTqctEvJxSsD1adPJTf4YvAk5+AEhOeVrbs=",     consumer_group="$Default",     eventhub_name="c-44-eventhub",     owner_level=0  # Epoch value set to 0 ) # Close the existing receiver with epoch 0 close_existing_receivers(consumer_client) # Reconnect with a higher epoch value consumer_client = EventHubConsumerClient.from_connection_string(     conn_str="Endpoint=sb://c-44-namespace.servicebus.windows.net/;SharedAccessKeyName=c44finalpolicy;SharedAccessKey=TRgyphdkiTqctEvJxSsD1adPJTf4YvAk5+AEhOeVrbs=",     consumer_group="$Default",     eventhub_name="c-44-eventhub",     owner_level=1  # Higher epoch value )

However, I am still facing the same issue where the function fails and reports an epoch receiver conflict. ### Request: Could you please help investigate and provide guidance on how to resolve this epoch receiver conflict? I need to ensure that no epoch 0 receivers are connected before reconnecting with a higher epoch value, but the issue persists despite closing the existing receivers. Any assistance or recommendations on this issue would be greatly appreciated. Best regards,  

Azure Functions
Azure Functions
An Azure service that provides an event-driven serverless compute platform.
5,004 questions
Azure Blob Storage
Azure Blob Storage
An Azure service that stores unstructured data in the cloud as blobs.
2,862 questions
Azure Event Hubs
Azure Event Hubs
An Azure real-time data ingestion service.
641 questions

1 answer

Sort by: Most helpful
Most helpful Newest Oldest
  1. Vinodh247 21,226 Reputation points
    2024-09-16T10:11:08.07+00:00

    Hi ,

    Thanks for reaching out to Microsoft Q&A.

    You are encountering an epoch conflict issue with your event hub receivers while trying to stream data from Event Hub to Blob Storage via an Azure Function.

    Understanding Epoch Receivers

    In event hub, an epoch is a versioning mechanism used to manage receiver instances. An epoch value of 0 is the default and indicates an initial receiver. When you have a receiver with epoch 0, any new receivers must use a higher epoch value to be allowed to connect.

    Troubleshooting Steps

    1. Ensure All Epoch '0' Receivers Are Closed:
      • Confirm that no other processes or instances are using epoch 0. You can check this by reviewing the Event Hub metrics and logs for any active receivers.
    2. Check for Concurrent Executions:
      • If your Azure Function is running multiple instances or if there are other services accessing the same Event Hub, ensure that they are not conflicting with each other. Each instance should be using a higher epoch or be properly closed before a new one connects.
    3. Properly Manage Epoch Changes:
      • When changing epochs, ensure that you are not only closing the client but also cleaning up any lingering connections. Ensure the close() method is effectively terminating all connections.
    4. Azure Function Configuration:
      • Make sure that the Event Hub trigger configuration in your Azure Function is correctly set up and that the function app is correctly handling Event Hub partitions.

    Please 'Upvote'(Thumbs-up) and 'Accept' as an answer if the reply was helpful. This will benefit other community members who face the same issue.

    0 comments

Your answer

Answers can be marked as Accepted Answers by the question author, which helps users to know the answer solved the author's problem.