Cannot change azurerm_eventhub_namespace from Standard to Basic due to auto-scale

[phatcher]

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Terraform (and AzureRM Provider) Version

Terraform v0.13.5

• provider registry.terraform.io/hashicorp/azurerm v2.41.0

Affected Resource(s)

• azurerm_eventhub_namespace

Terraform Configuration Files

Here's my module for configuring a Event Hub namespace in either Basic or Standard mode

locals {
  location = var.location == "global" ? var.region : var.location
  auto_inflate_enabled = var.sku == "Standard" ? true : false
  capacity = var.sku == "Standard" ? 1 : var.capacity
  maximum_throughput_units = var.sku == "Standard" ? var.capacity : 0
  zone_redundant = var.sku == "Standard" ? var.zone_redundant : null
}

resource "azurerm_eventhub_namespace" "this" {
  name                     = var.name
  location                 = var.location
  resource_group_name      = var.resource_group_name
  sku                      = var.sku
  capacity                 = local.capacity
  auto_inflate_enabled     = local.auto_inflate_enabled
  maximum_throughput_units = local.maximum_throughput_units

  identity {
    type = "SystemAssigned"
  }
}

Expected Behaviour

I should be able to go from Standard -> Basic

Actual Behaviour

If I have the code as is, i.e.

  auto_inflate_enabled = var.sku == "Standard" ? true : false
  maximum_throughput_units = var.sku == "Standard" ? var.capacity : 0

Then I get the error

eventhub.NamespacesClient#CreateOrUpdate: Failure sending request: StatusCode=0 -- Original Error: autorest/azure: Service returned an error. Status=<nil> Code="Conflict" Message="<Error><Code>409</Code><Detail>Namespace tier cannot be changed, as AutoInflate is not available in Basic tier. </Detail></Error>

If I change it so I'm not setting the auto-scale values

  auto_inflate_enabled = var.sku == "Standard" ? true : null
  maximum_throughput_units = var.sku == "Standard" ? var.capacity : null

, the provider correctly detects I'm in basic mode and set auto_inflate_enabled to false for me, but doesn't adjust the maximum_throughput_units value and I get the errror

Error: eventhub.NamespacesClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="BadRequest" Message="Cannot set MaximumThroughputUnits property if AutoInflate is not enabled.

So a suggestion is to also force the maximum_throughput_units to 0 if setting auto_inflate_enabled to false.

I can achieve the change via the portal, so it may be required to do two calls, one to remove auto scale and one to change the Sku from Standard -> Basic, but I'd expect the provider to do this rather than it being a client responsibility.

[ghost]

This has been released in version 2.47.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.47.0"
}
# ... other configuration ...

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 [email protected]. Thanks!