"Either maxRate or maxRatePerEndpoint should be set with RATE mode" when maxRate=0

[oioki]

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Terraform Version

Terraform v0.13.5
+ provider registry.terraform.io/hashicorp/google v4.35.0
+ provider registry.terraform.io/hashicorp/google-beta v4.35.0

Affected Resource(s)

• google_compute_backend_service

Terraform Configuration Files

data "google_compute_network_endpoint_group" "backend_1" {
  name = "k8s1-primary"
  zone = "europe-west3-b"
}

data "google_compute_network_endpoint_group" "backend_2" {
  name = "backup"
  zone = "us-central1-b"
}

resource "google_compute_backend_service" "test" {
  name             = "test"
  health_checks = [
    google_compute_health_check.test.self_link,
  ]

  backend {
    group           = data.google_compute_network_endpoint_group.backend_1.self_link
    balancing_mode  = "RATE"
    max_rate        = 100
    capacity_scaler = 1.0
  }

  backend {
    group           = data.google_compute_network_endpoint_group.backend_2.self_link
    balancing_mode  = "RATE"
    max_rate        = 0
    capacity_scaler = 1.0
  }
}

resource "google_compute_health_check" "test" {
  name        = "test-healthcheck"

  http_health_check {
    request_path = "/healthcheck"
    port         = 80
  }
}

Debug Output

https://gist.github.com/oioki/38256544918caac701f4934fd74c68eb

Expected Behavior

A new HTTP backend service is created with Maximum RPS set to 0.

Actual Behavior

The creation request fails with this error:

Error: Error creating BackendService: googleapi: Error 400: Invalid value for field 'resource.backends[0].balancingMode': 'RATE'. Either maxRate or maxRatePerEndpoint should be set with RATE mode., invalid

Steps to Reproduce

1. Set max_rate to 0 for one of the backend sections of google_compute_backend_service resource.
2. Run terraform apply either for resource creation or update.

Important Factoids

Setting max_rate to 0 for a specific backend is valid and ensures no requests are routed to this backend. It is possible to set max_rate to 0 via the Google Cloud console. In the case of the Google Cloud console, the critical part of the request looks like this (captured with Developer Tools):

[
  {
    "description": "",
    "groupUrl": "projects/my-project/zones/europe-west3-b/networkEndpointGroups/k8s1-primary",
    "balancingModeType": "MAX_RPS",
    "maxRate": {
      "intValue": 100000,
      "scope": "PER_TARGET"
    },
    "capacityScaler": 1
  },
  {
    "description": "",
    "groupUrl": "projects/my-project/zones/us-central1-b/networkEndpointGroups/backup",
    "balancingModeType": "MAX_RPS",
    "maxRate": {
      "intValue": 0,
      "scope": "PER_TARGET"
    },
    "capacityScaler": 1
  }
]

In the case of Terraform, this part looks like this:

  {
   "balancingMode": "RATE",
   "capacityScaler": 1,
   "group": "https://www.googleapis.com/compute/v1/projects/my-project/zones/us-central1-b/networkEndpointGroups/backup"
  },
  {
   "balancingMode": "RATE",
   "capacityScaler": 1,
   "group": "https://www.googleapis.com/compute/v1/projects/my-project/zones/europe-west3-b/networkEndpointGroups/k8s1-primary",
   "maxRate": 100
  }

References

Seems like the behavior of removing "maxRate" field when it's set to "0" value was added in:

• #1053

[edwardmedia]

@oioki it looks like this is the rule for balancing_mode . Did you set it the same for the case of the Google Cloud console?

resource "google_compute_backend_service" "test" {
...
  backend {
    balancing_mode  = "RATE" 
...
  }
}

[oioki]

Yes, I am keeping "Rate" balancing mode when updating via the Google Cloud console:

[edwardmedia]

@oioki I don't see the balancing_mode in below call. It looks like its default value is UTILIZATION, Can you try sending Rate mode to see what you get?

  {
    "description": "",
    "groupUrl": "projects/my-project/zones/us-central1-b/networkEndpointGroups/backup",
    "balancingModeType": "MAX_RPS",
    "maxRate": {
      "intValue": 0,
      "scope": "PER_TARGET"
    },
    "capacityScaler": 1
  }

I have tried setting maxRate = 0 and got the response from api None of the backends have a valid capacity

{
 "backends": [
  {
   "balancingMode": "RATE",
   "capacityScaler": 1,
   "group": "https://www.googleapis.com/compute/v1/projects/myproject/us-central1-a/networkEndpointGroups/issue12537",
   "maxRate": 0
  }
 ],
 "connectionDraining": {
  "drainingTimeoutSec": 300
 },
 "healthChecks": [
  "projects/myproject/global/healthChecks/issue12537"
 ],
 "iap": {
  "enabled": false,
  "oauth2ClientId": "",
  "oauth2ClientSecret": ""
 },
 "loadBalancingScheme": "EXTERNAL",
 "name": "issue12537"
}

Please provide the debug log that works for you

[edwardmedia]

@oioki is this still an issue?

[edwardmedia]

@oioki I am closing this now, assuming it is no longer an issue.

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