ConcurrentModificationException when creating multiple glue triggers against a workflow at once

[moreandres]

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Terraform CLI and Terraform AWS Provider Version

$ terraform -v
Terraform v1.0.11
on linux_amd64

• provider registry.terraform.io/hashicorp/aws v3.65.0

Affected Resource(s)

• aws_glue_workflow
• aws_glue_trigger
• aws_glue_job

Terraform Configuration Files

provider "aws" {
  region = "us-east-1"
}

resource "aws_glue_workflow" "workflow" {
  name = "test"
}

resource "aws_glue_trigger" "start" {
  name          = "start"
  workflow_name = aws_glue_workflow.workflow.name
  type          = "ON_DEMAND"

  actions {
    job_name = "start"
  }
}

locals {
  names = ["1", "2", "3", "4", "5"]
}

resource "aws_glue_trigger" "trigger" {

  for_each      = toset(local.names)
  name          = each.key
  workflow_name = aws_glue_workflow.workflow.name
  type          = "CONDITIONAL"

  actions {
    job_name = each.key
  }

  predicate {
    conditions {
      job_name = "start"
      state    = "SUCCEEDED"
    }
  }
}

Debug Output

debugging output

Expected Behavior

Multiple triggers should have been created concurrently and associated with the workflow resource.

Actual Behavior

Error: error creating Glue Trigger (1): ConcurrentModificationException: Workflow test was modified while adding trigger 1 to it

Steps to Reproduce

1. terraform apply -auto-approve

Important Factoids

Can be reproduced with jobs besides triggers.

References

exception documentation

[moreandres]

Hi! I'm interested in solving this issue, any pointers on where to start? Thanks!

[caioz7]

Same problem here

[stefan-novak-brt]

Came across this issue as well. Are there any workarounds?

Edit:

The following is a workaround:

until terraform apply --auto-approve
do
  sleep 2
done

🙃

[rbatorowski-at-pgs]

As workaround, add depends_on to your triggers, so they'll be created one by one. Worked for me.

[stagha]

Using depends_on doesn't work if you're creating triggers inside of a for_each. depends_on requires a static list of resources.

[github-actions]

This functionality has been released in v5.27.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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 have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.