Question

我已经看到了向带有cloudformation的表添加自动缩放的示例，但除了＆＃34;将相同的设置应用于全局二级索引＆＃34;在dynamodb控制台中的复选框，我没有看到使用云形态模板定义它的方法。

Answer 1

可以将辅助索引定义为自动缩放目标。

您只需使用resourceId作为后缀，并使用/index/**YOUR_INDEX_NAME**和dynamodb:index:WriteCapacityUnits作为dynamodb:index:ReadCapacityUnits，将索引指定为ScalableDimension。

E.g。

  SecIndexWriteCapacity:
    Type: AWS::ApplicationAutoScaling::ScalableTarget
    Properties:
      MaxCapacity: 1000
      MinCapacity: 15
      ResourceId: !Sub "table/${MY_MAIN_TABLE}/index/${MY_SECONDARY_INDEX_NAME}"
      RoleARN: !GetAtt ScalingRole.Arn
      ScalableDimension: dynamodb:index:WriteCapacityUnits
      ServiceNamespace: dynamodb
  SecIndexReadCapacity:
    Type: AWS::ApplicationAutoScaling::ScalableTarget
    Properties:
      MaxCapacity: 1000
      MinCapacity: 15
      ResourceId: !Sub "table/${MY_MAIN_TABLE}/index/MY_SECONDARY_INDEX_NAME"
      RoleARN: !GetAtt ScalingRole.Arn
      ScalableDimension: dynamodb:index:ReadCapacityUnits
      ServiceNamespace: dynamodb
  SecIndexWriteScalingPolicy:
    Type: AWS::ApplicationAutoScaling::ScalingPolicy
    Properties:
      PolicyName: SecIndexWriteScalingPolicy
      PolicyType: TargetTrackingScaling
      ScalingTargetId: !Ref SecIndexWriteCapacity
      TargetTrackingScalingPolicyConfiguration:
        TargetValue: 50.0
        ScaleInCooldown: 30
        ScaleOutCooldown: 1
        PredefinedMetricSpecification:
          PredefinedMetricType: DynamoDBWriteCapacityUtilization
  SecIndexReadScalingPolicy:
    Type: AWS::ApplicationAutoScaling::ScalingPolicy
    Properties:
      PolicyName: SecIndexReadScalingPolicy
      PolicyType: TargetTrackingScaling
      ScalingTargetId: !Ref SecIndexReadCapacity
      TargetTrackingScalingPolicyConfiguration:
        TargetValue: 50.0
        ScaleInCooldown: 30
        ScaleOutCooldown: 0
        PredefinedMetricSpecification:
          PredefinedMetricType: DynamoDBReadCapacityUtilization

另见https://aws.amazon.com/blogs/database/how-to-use-aws-cloudformation-to-configure-auto-scaling-for-amazon-dynamodb-tables-and-indexes/

Answer 2

实际上这是可能的。

遵循DynamoDB/CloudFormation的官方AWS示例，但是对于每个GSI，您需要创建单独的ScalableTarget和可扩展的策略。在ScalableTarget属性中，对ResourceId使用table/my-table/index/my-table-index表示法。

如何使用Cloudformation模板对dynamodb二级索引进行自动调整？

2 个答案: