code: public Observable<ServiceResponse<Void>> failoverWithServiceResponseAsync(String resourceGroupName, String accountName) {
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (accountName == null) {
              throw new IllegalArgumentException("Parameter accountName is required and cannot be null.");
          }
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          Observable<Response<ResponseBody>> observable = service.failover(resourceGroupName, accountName, this.client.subscriptionId(), this.client.apiVersion(), this.client.acceptLanguage(), this.client.userAgent());
          return client.getAzureClient().getPostOrDeleteResultAsync(observable, new LongRunningOperationOptions().withFinalStateVia(LongRunningFinalState.LOCATION), new TypeToken<Void>() { }.getType());
      }
docs: Failover request can be triggered for a storage account in case of availability issues. The failover occurs from the storage account's primary cluster to secondary cluster for RA-GRS accounts. The secondary cluster will become primary after failover.
  
  @param resourceGroupName The name of the resource group within the user's subscription. The name is case insensitive.
  @param accountName The name of the storage account within the specified resource group. Storage account names must be between 3 and 24 characters in length and use numbers and lower-case letters only.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request