Is the KEDA azure event hub scaler available for node applications using Dapr on Azure Container App?

[ChedyMissaouiAsForvia]

After testing the KEDA azure event hub scaler on a container app running a node js application that consumes event hub messages via dapr input bindings, we noticed that the container app never scales beyond 1 replica.

Given the following:

• Event hub topic has 1 partition
• We applied a load in the order of 100000s of messages per second-ish which should be enough to cause the auto scale
• We have several rules configured for several event hub topics
• We have the following which is one of the auto-scalers config (some values are redacted):

minReplicas = 0
maxReplicas = 4
rules = [
    name = "scale-rule-topic-0"
      custom = {
        type     = "azure-eventhub"
        metadata = {
          eventHubNamespace                   = "***"
          eventHubName                        = "***"
          consumerGroup                       = "***"
          storageAccountName                  = "***"
          blobContainer                       = "***"
          activationUnprocessedEventThreshold = "1"
          unprocessedEventThreshold           = "1"
          checkpointStrategy                  = "blobMetadata"
        }
   }
   ...
]

We have never observed an auto-scale despite a load that should largely trigger one.

In the KEDA azure event-hub scaler documentation, we have signs that the scaler is only supported for .NET and Python with the event-hub SDK. Can you please confirm this ?

In addition, we have read mentioned in this discussion that max number of replicas is equal to number of partitions in eventhub. Can you please confirm this also ?

[tomkerkhove]

In addition, we have read mentioned in this discussion that max number of replicas is equal to number of partitions in eventhub. Can you please confirm this also ?

Correct.

However, for support on Azure Container Apps we recommend reaching out to them given we are not in charge of that

[ChedyMissaouiAsForvia]

Thank you @tomkerkhove for your confirmation.