Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). # Use `ModifyCluster` with an AWS SDK or CLI The following code examples show how to use `ModifyCluster`. Action examples are code excerpts from larger programs and must be run in context. You can see this action in context in the following code example: + [Learn the basics](example_redshift_Scenario_section.md) ------ #### [ .NET ] **SDK for .NET (v4)** There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/dotnetv4/Redshift#code-examples). ``` /// /// Modify an Amazon Redshift cluster. /// /// The identifier for the cluster. /// The preferred maintenance window. /// True if successful. public async Task ModifyClusterAsync(string clusterIdentifier, string preferredMaintenanceWindow) { try { var request = new ModifyClusterRequest { ClusterIdentifier = clusterIdentifier, PreferredMaintenanceWindow = preferredMaintenanceWindow }; var response = await _redshiftClient.ModifyClusterAsync(request); Console.WriteLine($"The modified cluster was successfully modified and has {response.Cluster.PreferredMaintenanceWindow} as the maintenance window"); return true; } catch (ClusterNotFoundException ex) { Console.WriteLine($"Cluster {clusterIdentifier} not found: {ex.Message}"); return false; } catch (Exception ex) { Console.WriteLine($"Couldn't modify cluster. Here's why: {ex.Message}"); return false; } } ``` + For API details, see [ModifyCluster](https://docs.aws.amazon.com/goto/DotNetSDKV4/redshift-2012-12-01/ModifyCluster) in *AWS SDK for .NET API Reference*. ------ #### [ CLI ] **AWS CLI** Associate a Security Group with a ClusterThis example shows how to associate a cluster security group with the specified cluster.Command: ``` aws redshift modify-cluster --cluster-identifier mycluster --cluster-security-groups mysecuritygroup ``` Modify the Maintenance Window for a ClusterThis shows how to change the weekly preferred maintenance window for a cluster to be the minimum four hour window starting Sundays at 11:15 PM, and ending Mondays at 3:15 AM.Command: ``` aws redshift modify-cluster --cluster-identifier mycluster --preferred-maintenance-window Sun:23:15-Mon:03:15 ``` Change the Master Password for the ClusterThis example shows how to change the master password for a cluster.Command: ``` aws redshift modify-cluster --cluster-identifier mycluster --master-user-password A1b2c3d4 ``` + For API details, see [ModifyCluster](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/redshift/modify-cluster.html) in *AWS CLI Command Reference*. ------ #### [ Go ] **SDK for Go V2** There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/redshift#code-examples). ``` import ( "context" "errors" "log" "time" "github.com/aws/aws-sdk-go-v2/aws" "github.com/aws/aws-sdk-go-v2/service/redshift" "github.com/aws/aws-sdk-go-v2/service/redshift/types" ) // RedshiftActions wraps Redshift service actions. type RedshiftActions struct { RedshiftClient *redshift.Client } // ModifyCluster sets the preferred maintenance window for the given cluster. func (actor RedshiftActions) ModifyCluster(ctx context.Context, clusterId string, maintenanceWindow string) *redshift.ModifyClusterOutput { // Modify the cluster's maintenance window input := &redshift.ModifyClusterInput{ ClusterIdentifier: aws.String(clusterId), PreferredMaintenanceWindow: aws.String(maintenanceWindow), } var opErr *types.InvalidClusterStateFault output, err := actor.RedshiftClient.ModifyCluster(ctx, input) if err != nil && errors.As(err, &opErr) { log.Println("Cluster is in an invalid state.") panic(err) } else if err != nil { log.Printf("Failed to modify Redshift cluster: %v\n", err) panic(err) } log.Printf("The cluster was successfully modified and now has %s as the maintenance window\n", *output.Cluster.PreferredMaintenanceWindow) return output } ``` + For API details, see [ModifyCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.ModifyCluster) in *AWS SDK for Go API Reference*. ------ #### [ Java ] **SDK for Java 2.x** There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/redshift#code-examples). Modify a cluster. ``` /** * Modifies an Amazon Redshift cluster asynchronously. * * @param clusterId the identifier of the cluster to be modified * @return a {@link CompletableFuture} that completes when the cluster modification is complete */ public CompletableFuture modifyClusterAsync(String clusterId) { ModifyClusterRequest modifyClusterRequest = ModifyClusterRequest.builder() .clusterIdentifier(clusterId) .preferredMaintenanceWindow("wed:07:30-wed:08:00") .build(); return getAsyncClient().modifyCluster(modifyClusterRequest) .whenComplete((clusterResponse, exception) -> { if (exception != null) { if (exception.getCause() instanceof RedshiftException) { logger.info("Error: {} ", exception.getMessage()); } else { logger.info("Unexpected error: {} ", exception.getMessage()); } } else { logger.info("The modified cluster was successfully modified and has " + clusterResponse.cluster().preferredMaintenanceWindow() + " as the maintenance window"); } }); } ``` + For API details, see [ModifyCluster](https://docs.aws.amazon.com/goto/SdkForJavaV2/redshift-2012-12-01/ModifyCluster) in *AWS SDK for Java 2.x API Reference*. ------ #### [ JavaScript ] **SDK for JavaScript (v3)** There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/redshift#code-examples). Create the client. ``` import { RedshiftClient } from "@aws-sdk/client-redshift"; // Set the AWS Region. const REGION = "REGION"; //Set the Redshift Service Object const redshiftClient = new RedshiftClient({ region: REGION }); export { redshiftClient }; ``` Modify a cluster. ``` // Import required AWS SDK clients and commands for Node.js import { ModifyClusterCommand } from "@aws-sdk/client-redshift"; import { redshiftClient } from "./libs/redshiftClient.js"; // Set the parameters const params = { ClusterIdentifier: "CLUSTER_NAME", MasterUserPassword: "NEW_MASTER_USER_PASSWORD", }; const run = async () => { try { const data = await redshiftClient.send(new ModifyClusterCommand(params)); console.log("Success was modified.", data); return data; // For unit tests. } catch (err) { console.log("Error", err); } }; run(); ``` + For API details, see [ModifyCluster](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/redshift/command/ModifyClusterCommand) in *AWS SDK for JavaScript API Reference*. ------ #### [ Kotlin ] **SDK for Kotlin** There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/redshift#code-examples). Modify a cluster. ``` suspend fun modifyCluster(clusterId: String?) { val modifyClusterRequest = ModifyClusterRequest { clusterIdentifier = clusterId preferredMaintenanceWindow = "wed:07:30-wed:08:00" } RedshiftClient { region = "us-west-2" }.use { redshiftClient -> val clusterResponse = redshiftClient.modifyCluster(modifyClusterRequest) println( "The modified cluster was successfully modified and has ${clusterResponse.cluster?.preferredMaintenanceWindow} as the maintenance window", ) } } ``` + For API details, see [ModifyCluster](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. ------ #### [ Python ] **SDK for Python (Boto3)** There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/python/example_code/redshift#code-examples). ``` class RedshiftWrapper: """ Encapsulates Amazon Redshift cluster operations. """ def __init__(self, redshift_client): """ :param redshift_client: A Boto3 Redshift client. """ self.client = redshift_client def modify_cluster(self, cluster_identifier, preferred_maintenance_window): """ Modifies a cluster. :param cluster_identifier: The cluster identifier. :param preferred_maintenance_window: The preferred maintenance window. """ try: self.client.modify_cluster( ClusterIdentifier=cluster_identifier, PreferredMaintenanceWindow=preferred_maintenance_window, ) except ClientError as err: logging.error( "Couldn't modify a cluster. Here's why: %s: %s", err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise ``` The following code instantiates the RedshiftWrapper object. ``` client = boto3.client("redshift") redhift_wrapper = RedshiftWrapper(client) ``` + For API details, see [ModifyCluster](https://docs.aws.amazon.com/goto/boto3/redshift-2012-12-01/ModifyCluster) in *AWS SDK for Python (Boto3) API Reference*. ------ #### [ SAP ABAP ] **SDK for SAP ABAP** There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/sap-abap/services/rsh#code-examples). Modify a cluster. ``` TRY. " Example values: iv_cluster_identifier = 'my-redshift-cluster' " Example values: iv_pref_maintenance_wn = 'wed:07:30-wed:08:00' lo_rsh->modifycluster( iv_clusteridentifier = iv_cluster_identifier iv_preferredmaintenancewin00 = iv_pref_maintenance_wn ). MESSAGE 'Redshift cluster modified successfully.' TYPE 'I'. CATCH /aws1/cx_rshclustnotfoundfault. MESSAGE 'Cluster not found.' TYPE 'I'. CATCH /aws1/cx_rshinvcluststatefault. MESSAGE 'Invalid cluster state for modification.' TYPE 'I'. ENDTRY. ``` + For API details, see [ModifyCluster](https://docs.aws.amazon.com/sdk-for-sap-abap/v1/api/latest/index.html) in *AWS SDK for SAP ABAP API reference*. ------ For a complete list of AWS SDK developer guides and code examples, see [Using this service with an AWS SDK](sdk-general-information-section.md). This topic also includes information about getting started and details about previous SDK versions.