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Terraform CLI and Terraform AWS Provider Version

 Terraform v0.14.10
+ provider registry.terraform.io/hashicorp/aws v3.64.0

Affected Resource(s)

• aws_dms_replication_task

Terraform Configuration Files

resource "aws_dms_replication_task" "cdc_user" {
  replication_task_id       = "cdc-user"
  source_endpoint_arn       = aws_dms_endpoint.dc.endpoint_arn
  target_endpoint_arn       = aws_dms_endpoint.aws.endpoint_arn
  replication_instance_arn  = aws_dms_replication_instance.db.replication_instance_arn
  migration_type            = "cdc"
  table_mappings            = jsonencode(jsondecode(file("${path.module}/files/cdc-user_table_mappings.json")))
  replication_task_settings = jsonencode(jsondecode(file("${path.module}/files/cdc-user_task_settings.json")))
}

Debug Output

Panic Output

Expected Behavior

After upgrading the AWS provider from v3.58.0 to v3.64.0 Terraform should have maintained the existing cdc_start_position value for the replication task instead of setting that to null.

Actual Behavior

terraform plan output

   # aws_dms_replication_task.cdc_user will be updated in-place
   ~ resource "aws_dms_replication_task" "cdc_user" {
       - cdc_start_position        = "2021-12-14T12:15:05" -> null
         id                        = "cdc-user"
       ~ replication_task_settings = jsonencode(
           ~ {
               - TTSettings                          = {
                   - EnableTT         = false
                   - TTRecordSettings = null
                   - TTS3Settings     = null
                 } -> null
                 # (13 unchanged elements hidden)
             }
         )
         tags                      = {}
         # (8 unchanged attributes hidden)
     }

terraform apply fails with the error below

Error: InvalidParameterValueException: Invalid CdcStartPosition format
	status code: 400, request id: 35cc8d70-1267-4326-babd-f8b3367303fd

  on main.tf line 385, in resource "aws_dms_replication_task" "cdc_user":
385: resource "aws_dms_replication_task" "cdc_user" {

Steps to Reproduce

1. terraform apply
2. upgrade provider from v3.58.0 to v3.64.0
3. terraform apply

Important Factoids

Probably the task has been stopped/resumed after the task was created by terraform and no changes were detected in the plans since the option was not supported until v3.62.0.

References

• Add cdc_start_position parameter to aws_dms_replication_task resource #12276
• r/dms_replication_task: add support for cdc_start_position #21201