Update a Google Cloud Managed Service for Apache Kafka cluster

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/managedkafka/apiv1/managedkafkapb"
	"google.golang.org/api/option"
	"google.golang.org/protobuf/types/known/fieldmaskpb"

	managedkafka "cloud.google.com/go/managedkafka/apiv1"
)

func updateCluster(w io.Writer, projectID, region, clusterID string, memory int64, opts ...option.ClientOption) error {
	// projectID := "my-project-id"
	// region := "us-central1"
	// clusterID := "my-cluster"
	// memoryBytes := 4221225472
	ctx := context.Background()
	client, err := managedkafka.NewClient(ctx, opts...)
	if err != nil {
		return fmt.Errorf("managedkafka.NewClient got err: %w", err)
	}
	defer client.Close()

	clusterPath := fmt.Sprintf("projects/%s/locations/%s/clusters/%s", projectID, region, clusterID)
	capacityConfig := &managedkafkapb.CapacityConfig{
		MemoryBytes: memory,
	}
	cluster := &managedkafkapb.Cluster{
		Name:           clusterPath,
		CapacityConfig: capacityConfig,
	}
	paths := []string{"capacity_config.memory_bytes"}
	updateMask := &fieldmaskpb.FieldMask{
		Paths: paths,
	}

	req := &managedkafkapb.UpdateClusterRequest{
		UpdateMask: updateMask,
		Cluster:    cluster,
	}
	op, err := client.UpdateCluster(ctx, req)
	if err != nil {
		return fmt.Errorf("client.UpdateCluster got err: %w", err)
	}
	resp, err := op.Wait(ctx)
	if err != nil {
		return fmt.Errorf("op.Wait got err: %w", err)
	}
	fmt.Fprintf(w, "Updated cluster: %#v\n", resp)
	return nil
}

import com.google.api.gax.longrunning.OperationFuture;
import com.google.cloud.managedkafka.v1.CapacityConfig;
import com.google.cloud.managedkafka.v1.Cluster;
import com.google.cloud.managedkafka.v1.ClusterName;
import com.google.cloud.managedkafka.v1.ManagedKafkaClient;
import com.google.cloud.managedkafka.v1.OperationMetadata;
import com.google.cloud.managedkafka.v1.UpdateClusterRequest;
import com.google.protobuf.FieldMask;
import java.util.concurrent.ExecutionException;

public class UpdateCluster {

  public static void main(String[] args) throws Exception {
    // TODO(developer): Replace these variables before running the example.
    String projectId = "my-project-id";
    String region = "my-region"; // e.g. us-east1
    String clusterId = "my-cluster";
    long memoryBytes = 4221225472L; // 4 GiB
    updateCluster(projectId, region, clusterId, memoryBytes);
  }

  public static void updateCluster(
      String projectId, String region, String clusterId, long memoryBytes) throws Exception {
    CapacityConfig capacityConfig = CapacityConfig.newBuilder().setMemoryBytes(memoryBytes).build();
    Cluster cluster =
        Cluster.newBuilder()
            .setName(ClusterName.of(projectId, region, clusterId).toString())
            .setCapacityConfig(capacityConfig)
            .build();
    FieldMask updateMask = FieldMask.newBuilder().addPaths("capacity_config.memory_bytes").build();

    try (ManagedKafkaClient managedKafkaClient = ManagedKafkaClient.create()) {
      UpdateClusterRequest request =
          UpdateClusterRequest.newBuilder().setUpdateMask(updateMask).setCluster(cluster).build();
      OperationFuture<Cluster, OperationMetadata> future =
          managedKafkaClient.updateClusterOperationCallable().futureCall(request);
      Cluster response = future.get();
      System.out.printf("Updated cluster: %s\n", response.getName());
    } catch (ExecutionException e) {
      System.err.printf("managedKafkaClient.updateCluster got err: %s", e.getMessage());
    }
  }
}

from google.api_core.exceptions import GoogleAPICallError
from google.cloud import managedkafka_v1
from google.protobuf import field_mask_pb2

# TODO(developer)
# project_id = "my-project-id"
# region = "us-central1"
# cluster_id = "my-cluster"
# memory_bytes = 4295000000

client = managedkafka_v1.ManagedKafkaClient()

cluster = managedkafka_v1.Cluster()
cluster.name = client.cluster_path(project_id, region, cluster_id)
cluster.capacity_config.memory_bytes = memory_bytes
update_mask = field_mask_pb2.FieldMask()
update_mask.paths.append("capacity_config.memory_bytes")

# For a list of editable fields, one can check https://cloud.google.com/managed-kafka/docs/create-cluster#properties.
request = managedkafka_v1.UpdateClusterRequest(
    update_mask=update_mask,
    cluster=cluster,
)

try:
    operation = client.update_cluster(request=request)
    print(f"Waiting for operation {operation.operation.name} to complete...")
    response = operation.result()
    print("Updated cluster:", response)
except GoogleAPICallError as e:
    print(f"The operation failed with error: {e.message}")