error TS2339: Property 'autoScaleReadCapacity' does not exist on type 'ITable

Question

I'm using CDK (Typescript) to enable DDB autoscaling for existing table. I'm trying to call an autoScaleReadCapacity method to a imported table object.

 const importedtable = Table.fromTableArn(this, 'ImportedTable', 'arn:aws:dynamodb:us-west-2:011111:table/Testing-FE');
        importedtable.
        //config Autoscaling
        importedtable.autoScaleReadCapacity({
            minCapacity: 10                 
            maxCapacity: 10
                
        })

But getting error as

error TS2339: Property 'autoScaleReadCapacity' does not exist on type 'ITable'

Any clue on how to set auto scale properties for already created DDB table.

You can do any modification in the table properties in the imported table. You need to add auto scaling configuration in the stack from which table is created. — nirvana124
Yes. What i am trying to do is same on imported table i am trying to call autoscaleReadCapacity method. Is this approach wrong ? — Srikanth Rao

nirvana124 nirvana124 · Accepted Answer · 2021-03-24T09:35:16

Your approach is fine but Current implementation for Imported table in CDK is not supporting it.

When you import a table it returns an object of type ITable but autoScaleReadCapacity and autoScaleWriteCapacity methods are declared and implemented inside Table class.

You can use below code as workaround and open a issue in AWS CDK repository.

import { Construct, Stack } from '@aws-cdk/core';
import { BaseScalableAttribute, BaseScalableAttributeProps, ServiceNamespace } from '@aws-cdk/aws-applicationautoscaling';
import { Role } from '@aws-cdk/aws-iam';
import { Table } from '@aws-cdk/aws-dynamodb';

    const table = Table.fromTableName(this, 'MyTable', 'MyTable');

    const scalingRole = Role.fromRoleArn(this, 'ScalingRole', Stack.of(this).formatArn({
      service: 'iam',
      region: '',
      resource: 'role/aws-service-role/dynamodb.application-autoscaling.amazonaws.com',
      resourceName: 'AWSServiceRoleForApplicationAutoScaling_DynamoDBTable',
    }));
    
    new ScalableTableAttribute(this, 'ReadScaling', {
      serviceNamespace: ServiceNamespace.DYNAMODB,
      resourceId: `table/${table.tableName}`,
      dimension: 'dynamodb:table:ReadCapacityUnits', //dimension: 'dynamodb:table:WriteCapacityUnits',
      role: scalingRole,
      maxCapacity: 10,
      minCapacity: 10
    })


export class ScalableTableAttribute extends BaseScalableAttribute {
  constructor(scope: Construct, id: string, props: BaseScalableAttributeProps) {
    super(scope, id, props)
  }
}

error TS2339: Property 'autoScaleReadCapacity' does not exist on type 'ITable

1 Answers