fix(applicationautoscaling): typo in DYANMODB_WRITE_CAPACITY_UTILIZATION

packages/@aws-cdk/aws-applicationautoscaling/lib/target-tracking-scaling-policy.ts

@@ -136,15 +136,20 @@ export class TargetTrackingScalingPolicy extends CoreConstruct {
 
     super(scope, id);
 
+    // replace dummy value in DYNAMODB_WRITE_CAPACITY_UTILIZATION due to a jsii bug (https://github.com/aws/jsii/issues/2782)
+    const predefinedMetric = props.predefinedMetric === PredefinedMetric.DYNAMODB_WRITE_CAPACITY_UTILIZATION ?
+      PredefinedMetric.DYANMODB_WRITE_CAPACITY_UTILIZATION :
+      props.predefinedMetric;
+
     const resource = new CfnScalingPolicy(this, 'Resource', {
       policyName: props.policyName || cdk.Names.uniqueId(this),
       policyType: 'TargetTrackingScaling',
       scalingTargetId: props.scalingTarget.scalableTargetId,
       targetTrackingScalingPolicyConfiguration: {
         customizedMetricSpecification: renderCustomMetric(props.customMetric),
         disableScaleIn: props.disableScaleIn,
-        predefinedMetricSpecification: props.predefinedMetric !== undefined ? {
-          predefinedMetricType: props.predefinedMetric,
+        predefinedMetricSpecification: predefinedMetric !== undefined ? {
+          predefinedMetricType: predefinedMetric,
           resourceLabel: props.resourceLabel,
         } : undefined,
         scaleInCooldown: props.scaleInCooldown && props.scaleInCooldown.toSeconds(),
@@ -183,9 +188,20 @@ export enum PredefinedMetric {
    * @see https://docs.aws.amazon.com/autoscaling/application/APIReference/API_PredefinedMetricSpecification.html
    */
   DYNAMODB_READ_CAPACITY_UTILIZATION = 'DynamoDBReadCapacityUtilization',
+  /**
+   * DYNAMODB_WRITE_CAPACITY_UTILIZATION
+   *
+   * Suffix `dummy` is necessary due to jsii bug (https://github.com/aws/jsii/issues/2782).
+   * Duplicate values will be dropped, so this suffix is added as a workaround.
+   * The value will be replaced when this enum is used.
+   *
+   * @see https://docs.aws.amazon.com/autoscaling/application/APIReference/API_PredefinedMetricSpecification.html
+   */
+  DYNAMODB_WRITE_CAPACITY_UTILIZATION = 'DynamoDBWriteCapacityUtilization-dummy',
   /**
    * DYANMODB_WRITE_CAPACITY_UTILIZATION
    * @see https://docs.aws.amazon.com/autoscaling/application/APIReference/API_PredefinedMetricSpecification.html
+   * @deprecated use `PredefinedMetric.DYNAMODB_WRITE_CAPACITY_UTILIZATION`
    */
   DYANMODB_WRITE_CAPACITY_UTILIZATION = 'DynamoDBWriteCapacityUtilization',
   /**

packages/@aws-cdk/aws-applicationautoscaling/package.json

@@ -126,6 +126,7 @@
       "docs-public-apis:@aws-cdk/aws-applicationautoscaling.StepScalingPolicyProps",
       "docs-public-apis:@aws-cdk/aws-applicationautoscaling.PredefinedMetric.ECS_SERVICE_AVERAGE_CPU_UTILIZATION",
       "docs-public-apis:@aws-cdk/aws-applicationautoscaling.PredefinedMetric.DYNAMODB_READ_CAPACITY_UTILIZATION",
+      "docs-public-apis:@aws-cdk/aws-applicationautoscaling.PredefinedMetric.DYNAMODB_WRITE_CAPACITY_UTILIZATION",
       "docs-public-apis:@aws-cdk/aws-applicationautoscaling.PredefinedMetric.DYANMODB_WRITE_CAPACITY_UTILIZATION",
       "docs-public-apis:@aws-cdk/aws-applicationautoscaling.PredefinedMetric.ALB_REQUEST_COUNT_PER_TARGET",
       "docs-public-apis:@aws-cdk/aws-applicationautoscaling.PredefinedMetric.RDS_READER_AVERAGE_CPU_UTILIZATION",

packages/@aws-cdk/aws-applicationautoscaling/test/target-tracking.test.ts

@@ -53,6 +53,26 @@ describe('target tracking', () => {
 
   });
 
+  test('test setup target tracking on predefined metric for DYNAMODB_WRITE_CAPACITY_UTILIZATION', () => {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const target = createScalableTarget(stack);
+
+    // WHEN
+    target.scaleToTrackMetric('Tracking', {
+      predefinedMetric: appscaling.PredefinedMetric.DYNAMODB_WRITE_CAPACITY_UTILIZATION,
+      targetValue: 0.9,
+    });
+
+    // THEN
+    expect(stack).toHaveResourceLike('AWS::ApplicationAutoScaling::ScalingPolicy', {
+      TargetTrackingScalingPolicyConfiguration: {
+        PredefinedMetricSpecification: { PredefinedMetricType: 'DynamoDBWriteCapacityUtilization' },
+        TargetValue: 0.9,
+      },
+    });
+  });
+
   test('test setup target tracking on custom metric', () => {
     // GIVEN
     const stack = new cdk.Stack();

packages/@aws-cdk/aws-dynamodb/lib/scalable-table-attribute.ts

@@ -25,7 +25,7 @@ export class ScalableTableAttribute extends appscaling.BaseScalableAttribute {
     }
     this.scalingPolicyCreated = true;
     const predefinedMetric = this.props.dimension.indexOf('ReadCapacity') === -1
-      ? appscaling.PredefinedMetric.DYANMODB_WRITE_CAPACITY_UTILIZATION
+      ? appscaling.PredefinedMetric.DYNAMODB_WRITE_CAPACITY_UTILIZATION
       : appscaling.PredefinedMetric.DYNAMODB_READ_CAPACITY_UTILIZATION;
 
     super.doScaleToTrackMetric('Tracking', {