Bigtable cluster parameter num_nodes misleading

[robertb724]

Community Note

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request.
• Please do not leave +1 or me too comments, they generate extra noise for issue followers and do not help prioritize the request.
• If you are interested in working on this issue or have submitted a pull request, please leave a comment.
• If an issue is assigned to a user, that user is claiming responsibility for the issue.
• Customers working with a Google Technical Account Manager or Customer Engineer can ask them to reach out internally to expedite investigation and resolution of this issue.

Terraform Version & Provider Version(s)

Terraform v1.9.5
on darwin_arm64

• provider registry.terraform.io/hashicorp/google v6.14.0

Affected Resource(s)

google_bigtable_instance

Terraform Configuration

resource "google_bigtable_instance" "test_instance" {
  name                = "tf-test-bigtable-instance"
  project             = "var.project"
  deletion_protection = false

  cluster {
    cluster_id   = "tf-test-bigtable-cluster"
    zone         = "us-central1-a"
    storage_type = "HDD"
  }

  labels = {
    environment = "test"
    managed_by  = "terraform"
  }
}

provider "google" {
    project = "var.project"
    region  = "us-central1"

}

Debug Output

No response

Expected Behavior

The documentation states:

num_nodes - (Optional) The number of nodes in the cluster. If no value is set, Cloud Bigtable automatically allocates nodes based on your data footprint and optimized for 50% storage utilization.

This leads me to believe if I omit this value or set it to null the cluster will have a basic autoscaling configuration set.

Actual Behavior

The bigtable cluster is created with the property:

Node scaling mode Manually scale nodes

and there is 1 node.

This leads me to believe that the cluster will be 1 static node.

Steps to reproduce

1. terraform apply

Important Factoids

No response

References

https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/bigtable_instance#num_nodes-1

b/385406295