EventHub change partition count ends with error

[ghost]

This issue was originally opened by @KenticoMartinS as hashicorp/terraform#19029. It was migrated here as a result of the provider split. The original body of the issue is below.

---

Terraform Version

v0.11.8

Terraform Configuration Files

resource "azurerm_resource_group" "test" {
  name     = "resourceGroup1"
  location = "West US"
}

resource "azurerm_eventhub_namespace" "test" {
  name                = "acceptanceTestEventHubNamespace"
  location            = "${azurerm_resource_group.test.location}"
  resource_group_name = "${azurerm_resource_group.test.name}"
  sku                 = "Standard"
  capacity            = 1
}

resource "azurerm_eventhub" "test" {
  name                = "acceptanceTestEventHub"
  namespace_name      = "${azurerm_eventhub_namespace.test.name}"
  resource_group_name = "${azurerm_resource_group.test.name}"
  partition_count     = 4
  message_retention   = 1
}

Debug Output

Crash Output

Terraform will perform the following actions:

  ~ azurerm_eventhub.default
      partition_count: "4" => "12"

Error: Error applying plan:
1 error(s) occurred:

* azurerm_eventhub.default: eventhub.EventHubsClient#CreateOrUpdate: Failure responding to request: StatusCode=400 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="BadRequest" Message="SubCode=40000. PartitionCount cannot be changed for EventHub. TrackingId:a5cfc1c8-ebe6-402c-bf4c-86e0475cbc7b_M0SN1_M0SN1_G12, SystemTracker:acceptanceTestEventHubNamespace.servicebus.windows.acceptanceTestEventHub, Timestamp:10/9/2018 11:26:03 AM CorrelationId: 6a34bd16-96a0-44c0-b981-59e3cf83b5bf"

Expected Behavior

According to the documentation/FAQ it is not possible to change the partition count of existing event hub. Terraform should re-create the Event Hub in order to change the partition count.

Actual Behavior

Terraform exited with an error.

Steps to Reproduce

1. terraform init
2. terraform apply
3. Modify partition count in event hub resource difinition
4. terraform apply

Additional Context

References

[tombuildsstuff]

hey @KenticoMartinS

Thanks for opening this issue :)

Just to add some notes/context here as I've tagged this "good first issue" - given it's not possible to change this value we should be able to make the partition_count field ForceNew: true (which means that when the value of partition_count changes it'll require that Terraform destroys & creates a new Event Hub).

Thanks!

[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 👉 hashibot-feedback@hashicorp.com. Thanks!