Why do I get "AttributeName cannot be empty" when making a DynamoDB table using CloudFormation?

user_6111475 0
Viewed 350

I'm trying to create two DynamoDB tables. Both tables have just one partition key, and one has a GSI with a partition key and a sort key. When I try and create the stack in CF, I receive an error on both tables stating that "Property AttributeName cannot be empty.". However, I believe I have provided AttributeName for each of my key values. I have converted the template to JSON as well, yet I get the same error. Where am I going wrong? Please note that this is not the complete template, only the part that is causing an error. Thanks very much in advance!

YAML config:

DynamoDBTable:
        Type: "AWS::DynamoDB::Table"
        Properties:
            AttributeDefinitions: 
              - 
                AttributeName: "eventName"
                AttributeType: "S"
            TableName: "BlockCursorTable"
            Tags: 
              - 
                Key: "project"
                Value: "flow-event-monitor"
            KeySchema: 
              - 
                AttributeName: "eventName"
                KeyType: "HASH"
            ProvisionedThroughput: 
                ReadCapacityUnits: 1
                WriteCapacityUnits: 1
            TimeToLiveSpecification: 
                Enabled: false

    DynamoDBTable2:
        Type: "AWS::DynamoDB::Table"
        Properties:
            AttributeDefinitions: 
              - 
                AttributeName: "listingResourceID"
                AttributeType: "N"
              - 
                AttributeName: "staticKey"
                AttributeType: "N"
              - 
                AttributeName: "timestamp"
                AttributeType: "S"
            TableName: "ListingTable"
            Tags: 
              - 
                Key: "project"
                Value: "flow-event-monitor"
            KeySchema: 
              - 
                AttributeName: "listingResourceID"
                KeyType: "HASH"
            ProvisionedThroughput: 
                ReadCapacityUnits: 1
                WriteCapacityUnits: 1
            GlobalSecondaryIndexes: 
              - 
                IndexName: "staticKey-timestamp-index"
                KeySchema: 
                  - 
                    AttributeName: "staticKey"
                    KeyType: "HASH"
                  - 
                    AttributeName: "timestamp"
                    KeyType: "RANGE"
                Projection: 
                    ProjectionType: "ALL"
                ProvisionedThroughput: 
                    ReadCapacityUnits: 1
                    WriteCapacityUnits: 1
            TimeToLiveSpecification: 
                Enabled: false

Equivalent JSON template:

{
  "DynamoDBTable": {
    "Type": "AWS::DynamoDB::Table",
    "Properties": {
      "AttributeDefinitions": [
        {
          "AttributeName": "eventName",
          "AttributeType": "S"
        }
      ],
      "TableName": "BlockCursorTable",
      "Tags": [
        {
          "Key": "project",
          "Value": "flow-event-monitor"
        }
      ],
      "KeySchema": [
        {
          "AttributeName": "eventName",
          "KeyType": "HASH"
        }
      ],
      "ProvisionedThroughput": {
        "ReadCapacityUnits": 1,
        "WriteCapacityUnits": 1
      },
      "TimeToLiveSpecification": {
        "Enabled": false
      }
    }
  },
  "DynamoDBTable2": {
    "Type": "AWS::DynamoDB::Table",
    "Properties": {
      "AttributeDefinitions": [
        {
          "AttributeName": "listingResourceID",
          "AttributeType": "N"
        },
        {
          "AttributeName": "staticKey",
          "AttributeType": "N"
        },
        {
          "AttributeName": "timestamp",
          "AttributeType": "S"
        }
      ],
      "TableName": "ListingTable",
      "Tags": [
        {
          "Key": "project",
          "Value": "flow-event-monitor"
        }
      ],
      "KeySchema": [
        {
          "AttributeName": "listingResourceID",
          "KeyType": "HASH"
        }
      ],
      "ProvisionedThroughput": {
        "ReadCapacityUnits": 1,
        "WriteCapacityUnits": 1
      },
      "GlobalSecondaryIndexes": [
        {
          "IndexName": "staticKey-timestamp-index",
          "KeySchema": [
            {
              "AttributeName": "staticKey",
              "KeyType": "HASH"
            },
            {
              "AttributeName": "timestamp",
              "KeyType": "RANGE"
            }
          ],
          "Projection": {
            "ProjectionType": "ALL"
          },
          "ProvisionedThroughput": {
            "ReadCapacityUnits": 1,
            "WriteCapacityUnits": 1
          }
        }
      ],
      "TimeToLiveSpecification": {
        "Enabled": false
      }
    }
  }
}
amazon-cloudformation amazon-dynamodb amazon-web-services yaml
1 Answers

You're specifying a TimeToLiveSpecification with no AttributeName for both tables, which is required per AWS docs.

The reason why the Enabled property exists, is actually for when you need to update the AttributeName for an already enabled TTL - in that case, the Enabled field is used to first disable the TTL to then allow you to change the AttributeName at the same time you re-enable TTL.

In your case, you want TTL disabled.

Time to Live is disabled by default, so feel free to remove those sections from your CloudFormation template as they take no effect.

I’ve included a Resources section below to allow you to test (considering you’ve only shared a part of your template).

This should work:

{
  "Resources":{
    "DynamoDBTable":{
      "Type":"AWS::DynamoDB::Table",
      "Properties":{
        "AttributeDefinitions":[
          {
            "AttributeName":"eventName",
            "AttributeType":"S"
          }
        ],
        "TableName":"BlockCursorTable",
        "Tags":[
          {
            "Key":"project",
            "Value":"flow-event-monitor"
          }
        ],
        "KeySchema":[
          {
            "AttributeName":"eventName",
            "KeyType":"HASH"
          }
        ],
        "ProvisionedThroughput":{
          "ReadCapacityUnits":1,
          "WriteCapacityUnits":1
        }
      }
    },
    "DynamoDBTable2":{
      "Type":"AWS::DynamoDB::Table",
      "Properties":{
        "AttributeDefinitions":[
          {
            "AttributeName":"listingResourceID",
            "AttributeType":"N"
          },
          {
            "AttributeName":"staticKey",
            "AttributeType":"N"
          },
          {
            "AttributeName":"timestamp",
            "AttributeType":"S"
          }
        ],
        "TableName":"ListingTable",
        "Tags":[
          {
            "Key":"project",
            "Value":"flow-event-monitor"
          }
        ],
        "KeySchema":[
          {
            "AttributeName":"listingResourceID",
            "KeyType":"HASH"
          }
        ],
        "ProvisionedThroughput":{
          "ReadCapacityUnits":1,
          "WriteCapacityUnits":1
        },
        "GlobalSecondaryIndexes":[
          {
            "IndexName":"staticKey-timestamp-index",
            "KeySchema":[
              {
                "AttributeName":"staticKey",
                "KeyType":"HASH"
              },
              {
                "AttributeName":"timestamp",
                "KeyType":"RANGE"
              }
            ],
            "Projection":{
              "ProjectionType":"ALL"
            },
            "ProvisionedThroughput":{
              "ReadCapacityUnits":1,
              "WriteCapacityUnits":1
            }
          }
        ]
      }
    }
  }
}
user_48003440
Related