DynamoDB Table with replica v2019.11.21 and PAY_PER_REQUEST makes GSI modifications in a loop

[Seldaek]

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Terraform Version

Terraform v0.12.24

• provider.aws v2.58.0
• provider.template v2.1.2

Affected Resource(s)

• aws_dynamodb_table

Terraform Configuration Files

resource "aws_dynamodb_table" "sessions_us-west-2" {
  name           = "sessions"
  billing_mode   = "PAY_PER_REQUEST"
  hash_key       = "SessionId"

  attribute {
    name = "SessionId"
    type = "S"
  }

  attribute {
    name = "UserId"
    type = "N"
  }

  attribute {
    name = "ExpiresAt"
    type = "N"
  }

  global_secondary_index {
    name               = "UserSessionsIndex"
    hash_key           = "UserId"
    range_key          = "ExpiresAt"
    projection_type    = "INCLUDE"
    non_key_attributes = ["UserId", "ExpiresAt", "SessionId"]
  }

  ttl {
    attribute_name = "ExpiresAt"
    enabled        = true
  }

  server_side_encryption {
    enabled = true
  }

  stream_enabled = true
  stream_view_type = "NEW_AND_OLD_IMAGES"

  replica {
    region_name = "eu-west-1"
  }
}

Expected Behavior

terraform apply should not do any changes

Actual Behavior

Every time I run, it wants to update the GSI with the same data..

      + global_secondary_index {
          + hash_key           = "UserId"
          + name               = "UserSessionsIndex"
          + non_key_attributes = [
              + "UserId",
              + "ExpiresAt",
              + "SessionId",
            ]
          + projection_type    = "INCLUDE"
          + range_key          = "ExpiresAt"
          + read_capacity      = 0
          + write_capacity     = 0
        }
      - global_secondary_index {
          - hash_key           = "UserId" -> null
          - name               = "UserSessionsIndex" -> null
          - non_key_attributes = [
              - "UserId",
              - "ExpiresAt",
              - "SessionId",
            ] -> null
          - projection_type    = "INCLUDE" -> null
          - range_key          = "ExpiresAt" -> null
          - read_capacity      = 0 -> null
          - write_capacity     = 0 -> null
        }

I tried specifying the read_capacity/write_capacity as that was the only missing thing I saw, which might be causing this, but it doesn't help, still does the same with this:

  global_secondary_index {
    name               = "UserSessionsIndex"
    hash_key           = "UserId"
    range_key          = "ExpiresAt"
    projection_type    = "INCLUDE"
    non_key_attributes = ["UserId", "ExpiresAt", "SessionId"]
    read_capacity      = 0
    write_capacity     = 0
  }

Note that it should not be required to specify these as we are using PAY_PER_REQUEST billing_mode.

Steps to Reproduce

1. terraform apply, twice

References

• #12342 / cc @cmonty (thanks for the implementation btw, this came just as I needed it! :)

[cmonty]

Thanks @Seldaek!

We had this come up in testing and I think is related to #3828

[Seldaek]

Ah thanks that one has a workaround in https://github.com/terraform-providers/terraform-provider-aws/issues/3828#issuecomment-569041696 👍

[maryelizbeth]

Hi Y'all, we are currently tracking this issue alongside #671.

We've added #671 to our team's prioritization board and are planning to address it and its related PRs in a near-term release. As this issue is related, we'll keep an eye on this and check back to see if our solution to #671 fixes/closes this as well.

Thanks!

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