Updating layer not triggering lambda alias update

[VIKASPATID]

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Terraform Version

Terraform v0.12.21

Affected Resource(s)

aws_lambda_alias

Terraform Configuration Files

data "archive_file" "lambda_layer_zip" {
  type        = "zip"
  source_dir  = "../layer/"
  output_path = "./layer.zip"
}

resource "aws_lambda_layer_version" "test_layer" {
  filename              = data.archive_file.lambda_layer_zip.output_path
  source_code_hash      = data.archive_file.lambda_layer_zip.output_base64sha256
  layer_name            = "test-layer"
  compatible_runtimes   = ["python3.8"]
}

data "archive_file" "function_zip" {
  type        = "zip"
  source_dir  = "../function/"
  output_path = "./function.zip"
}

resource "aws_lambda_function" "test_function" {
  function_name     = "TestFunction"
  filename          = data.archive_file.function_zip.output_path
  source_code_hash  = data.archive_file.function_zip.output_base64sha256
  handler           = "file.event_handler"
  memory_size       = 128
  timeout           = 60
  runtime           = "python3.8"
  layers            = [aws_lambda_layer_version.test_layer.arn]
  role              = data.aws_iam_role.service_role.arn
  publish           = true
}


resource "aws_lambda_alias" "live_alias" {
  name             = "live"
  description      = "Alias named live"
  function_name    = aws_lambda_function.test_function.arn
  function_version = aws_lambda_function.test_function.version
}

Terraform Plan/Apply Output

Terraform will perform the following actions:

  #aws_lambda_function.test_function will be updated in-place
  ~ resource "aws_lambda_function" "test_function" {
        arn                            = "arn:aws:lambda:us-east-1:xxxxxxxxx:function:TestFunction"
        filename                       = "./function.zip"
        function_name                  = "TestFunction"
        handler                        = "file.event_handler"
        id                             = "TestFunction"
        invoke_arn                     = "arn:aws:apigateway:us-east-1:lambda:path/2015-03-31/functions/arn:aws:lambda:us-east-1:xxxxxxxxx:function:TestFunction/invocations"
        last_modified                  = "2020-03-17T07:07:54.388+0000"
      ~ layers                         = [
          - "arn:aws:lambda:us-east-1:xxxxxxxx:layer:test-layer:3",
        ] -> (known after apply)
        memory_size                    = 128
        publish                        = true
        qualified_arn                  = "arn:aws:lambda:us-east-1:xxxxxxxxx:function:TestFunction:3"
        reserved_concurrent_executions = -1
        role                           = "arn:aws:iam::xxxxxxxxxx:role/service-execution-iam-role"
        runtime                        = "python3.8"
        source_code_hash               = "37GBoC23gPCJjXByNhvpb//tL/oPDtOuKgIH9+iTRQY="
        source_code_size               = 201
        tags                           = {}
        timeout                        = 60
        version                        = "3"

        tracing_config {
            mode = "PassThrough"
        }
    }

  # aws_lambda_layer_version.test_layer must be replaced
-/+ resource "aws_lambda_layer_version" "test_layer" {
      ~ arn                 = "arn:aws:lambda:us-east-1:xxxxxxxxxx:layer:test-layer:3" -> (known after apply)
        compatible_runtimes = [
            "python3.8",
        ]
      ~ created_date        = "2020-03-17T07:07:54.237+0000" -> (known after apply)
        filename            = "./layer.zip"
      ~ id                  = "arn:aws:lambda:us-east-1:xxxxxxxxx:layer:test-layer:3" -> (known after apply)
      ~ layer_arn           = "arn:aws:lambda:us-east-1:xxxxxxx:layer:test-layer" -> (known after apply)
        layer_name          = "test-layer"
      ~ source_code_hash    = "7/8pf+lQgFMJfm+MIEboG+1sd5EBz36mw5Eczq15/6A=" -> "zjJMlGy7/M1po4YAhxhrPeUNDzViAQ+YF+2mBotbp2E=" # forces replacement
      ~ source_code_size    = 188 -> (known after apply)
      ~ version             = "3" -> (known after apply)
    }

Expected Behavior

It is expected to update lambda alias to point to the newest version

Actual Behavior

On updating layer code, layer version increased, lambda function also got updated (function version increased). But lambda alias is still pointing to the previous version

[justinretzolk]

Hey @VIKASPATID 👋 Thank you for taking the time to file this issue. Given that there's been a number of AWS provider releases since you initially filed this, can you confirm whether you're still experiencing this behavior?