feat(redshift): multi AZ cluster (#29976)

### Issue # (if applicable)

Closes #<issue number here>.

### Reason for this change

AWS CDK cannot configure Redshift multi-AZ cluster.

### Description of changes

Add `multiAz` to `clusterProps`.

### Description of how you validated changes

I've added both unit and integ tests.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-redshift-alpha/README.md

@@ -556,6 +556,28 @@ const cluster = new Cluster(this, 'Redshift', {
 cluster.addIamRole(role);
 ```
 
+## Multi-AZ
+
+Amazon Redshift supports [multiple Availability Zones (Multi-AZ) deployments]((https://docs.aws.amazon.com/redshift/latest/mgmt/managing-cluster-multi-az.html)) for provisioned RA3 clusters.
+By using Multi-AZ deployments, your Amazon Redshift data warehouse can continue operating in failure scenarios when an unexpected event happens in an Availability Zone.
+
+To create a Multi-AZ cluster, set the `multiAz` property to `true` when creating the cluster.
+
+```ts
+declare const vpc: ec2.IVpc;
+
+new redshift.Cluster(stack, 'Cluster', {
+ masterUser: {
+ masterUsername: 'admin',
+ },
+ vpc, // 3 AZs are required for Multi-AZ
+ nodeType: redshift.NodeType.RA3_XLPLUS, // must be RA3 node type
+ clusterType: redshift.ClusterType.MULTI_NODE, // must be MULTI_NODE
+ numberOfNodes: 2, // must be 2 or more
+ multiAz: true,
+});
+```
+
 ## Resizing
 
 As your data warehousing needs change, it's possible to resize your Redshift cluster. If the cluster was deployed via CDK, 

packages/@aws-cdk/aws-redshift-alpha/lib/cluster.ts

@@ -385,6 +385,13 @@ export interface ClusterProps {
  * @default - false
  */
  readonly enhancedVpcRouting?: boolean;
+
+ /**
+ * Indicating whether Amazon Redshift should deploy the cluster in two Availability Zones.
+ *
+ * @default - false
+ */
+ readonly multiAz?: boolean;
 }
 
 /**
@@ -558,6 +565,17 @@ export class Cluster extends ClusterBase {
  );
  }
 
+ const nodeType = props.nodeType || NodeType.DC2_LARGE;
+
+ if (props.multiAz) {
+ if (!nodeType.startsWith('ra3')) {
+ throw new Error(`Multi-AZ cluster is only supported for RA3 node types, got: ${props.nodeType}`);
+ }
+ if (clusterType === ClusterType.SINGLE_NODE) {
+ throw new Error('Multi-AZ cluster is not supported for `clusterType` single-node');
+ }
+ }
+
  this.cluster = new CfnCluster(this, 'Resource', {
  // Basic
  allowVersionUpgrade: true,
@@ -574,7 +592,7 @@ export class Cluster extends ClusterBase {
  ?? props.masterUser.masterPassword?.unsafeUnwrap()
  ?? 'default',
  preferredMaintenanceWindow: props.preferredMaintenanceWindow,
- nodeType: props.nodeType || NodeType.DC2_LARGE,
+ nodeType,
  numberOfNodes: nodeCount,
  loggingProperties,
  iamRoles: Lazy.list({ produce: () => this.roles.map(role => role.roleArn) }, { omitEmpty: true }),
@@ -586,6 +604,7 @@ export class Cluster extends ClusterBase {
  classic: props.classicResizing,
  elasticIp: props.elasticIp,
  enhancedVpcRouting: props.enhancedVpcRouting,
+ multiAz: props.multiAz,
  });
 
  this.cluster.applyRemovalPolicy(removalPolicy, {

packages/@aws-cdk/aws-redshift-alpha/test/cluster.test.ts

@@ -4,7 +4,7 @@ import * as iam from 'aws-cdk-lib/aws-iam';
 import * as kms from 'aws-cdk-lib/aws-kms';
 import * as s3 from 'aws-cdk-lib/aws-s3';
 import * as cdk from 'aws-cdk-lib';
-import { Cluster, ClusterParameterGroup, ClusterSubnetGroup, ClusterType } from '../lib';
+import { Cluster, ClusterParameterGroup, ClusterSubnetGroup, ClusterType, NodeType } from '../lib';
 import { CfnCluster } from 'aws-cdk-lib/aws-redshift';
 
 let stack: cdk.Stack;
@@ -614,6 +614,67 @@ test('elastic ip address', () => {
  });
 });
 
+describe('multi AZ cluster', () => {
+ test('create a multi AZ cluster', () => {
+ // WHEN
+ new Cluster(stack, 'Redshift', {
+ masterUser: {
+ masterUsername: 'admin',
+ masterPassword: cdk.SecretValue.unsafePlainText('tooshort'),
+ },
+ vpc,
+ nodeType: NodeType.RA3_XLPLUS,
+ multiAz: true,
+ });
+
+ // THEN
+ Template.fromStack(stack).hasResourceProperties('AWS::Redshift::Cluster', {
+ AllowVersionUpgrade: true,
+ MasterUsername: 'admin',
+ MasterUserPassword: 'tooshort',
+ ClusterType: 'multi-node',
+ AutomatedSnapshotRetentionPeriod: 1,
+ Encrypted: true,
+ NumberOfNodes: 2,
+ NodeType: 'ra3.xlplus',
+ DBName: 'default_db',
+ PubliclyAccessible: false,
+ ClusterSubnetGroupName: { Ref: 'RedshiftSubnetsDFE70E0A' },
+ VpcSecurityGroupIds: [
+ { 'Fn::GetAtt': ['RedshiftSecurityGroup796D74A7', 'GroupId'] },
+ ],
+ MultiAZ: true,
+ });
+ });
+
+ test('throw error for invalid node type', () => {
+ expect(() => {
+ new Cluster(stack, 'Redshift', {
+ masterUser: {
+ masterUsername: 'admin',
+ },
+ vpc,
+ nodeType: NodeType.DS2_XLARGE,
+ multiAz: true,
+ });
+ }).toThrow('Multi-AZ cluster is only supported for RA3 node types, got: ds2.xlarge');
+ });
+
+ test('throw error for single node cluster', () => {
+ expect(() => {
+ new Cluster(stack, 'Redshift', {
+ masterUser: {
+ masterUsername: 'admin',
+ },
+ vpc,
+ nodeType: NodeType.RA3_XLPLUS,
+ multiAz: true,
+ clusterType: ClusterType.SINGLE_NODE,
+ });
+ }).toThrow('Multi-AZ cluster is not supported for `clusterType` single-node');
+ });
+});
+
 describe('reboot for Parameter Changes', () => {
  test('throw error for cluster without parameter group', () => {
  // Given