Report

Related: Azure/azure-sdk-for-net#42409

As of Azure.Messaging.EventHubs v5.11.0, the format of checkpoints written to blob storage has changed. Notably, the value of offset is null. In our case, this caused KEDA to over-scale a service. Downgrading the SDK to v5.10.0 resolved the issue.

In response to my original issue, it was asserted by a Microsoft contributor that this change is intentional and that the implementation of checkpoints are not to be relied upon.

Please refer to the original issue for more in-depth details and reproduction steps.

Expected Behavior

I expected KEDA to scale my service appropriately.

Actual Behavior

KEDA over-scaled the service until the Azure SDK was downgraded and the old checkpoint format restored.

Steps to Reproduce the Problem

private async Task ProcessEventAsync(ProcessEventArgs eventArgs)
{
    await eventArgs.UpdateCheckpointAsync(); // breakpoint here and examine Offset in memory
    log.LogInformation("checkpoint created"); // breakpoint here and examine offset in checkpoint
}

Logs from KEDA operator

No response

KEDA Version

2.12.1

Kubernetes Version

None

Platform

Microsoft Azure

Scaler Details

Azure Event Hubs

Anything else?

No response