Azure Functions - Event Hub not triggering Functions

Question

I have an Azure infrastructure:

2 HTTP Functions -> Event Hub -> 2 Functions -> Table Storage

(so two http functions sending messages to event hub, and two functions triggered by messages in Event Hub, one of them saving message in table storage)

The infrastructure is daily automatically created by Azure ARM templates, with the use of Azure CLI. I haven't changed the logic in recent two months but since beginning of April I have noticed the new, weird behaviour.

At the end of setting up, E2E tests are executed automatically. They are sending some message and after some time they check, if message are in table storage.

And here is the problem: since beginning of April these tests almost always fail! And I did not change anything in logic of function or template.json's for infrastructure.

It looks that Functions that should be triggered by Event Hub are not executed at all! I have already found a workaround for it - if I go to Azure portal and run these functions manually ("Run" button above code editor), then the functions finally starts to work!

Does anybody else encounter this problem? Is there some way to automatically, directly run non-HTTP triggered function by e.g. Azure CLI or REST interface?

Answer 1

It seems that problem is already quite well known: https://github.com/Azure/Azure-Functions/issues/210

I'm using currently workaround from this issue, i.e. calling Azure CLI's method to synchronize function triggers after creating infrastructure and zip pushing of functions:

az resource invoke-action --resource-group <resourceGrouName> --action syncfunctiontriggers --name <functionAppName> --resource-type Microsoft.Web/sites