Model Presto Data Using Azure Analysis Services

Microsoft Azure Analysis Services (AAS) is a fully-managed platform-as-a-service (PaaS) offering that delivers enterprise-grade data models in the cloud. When combined with CData Connect Cloud, AAS facilitates immediate cloud-to-cloud access to Presto data for applications. This article outlines the process of connecting to Presto via Connect Cloud and importing Presto data into Visual Studio using an AAS extension.

CData Connect Cloud offers a seamless cloud-to-cloud interface tailored for Presto, enabling you to create live models of Presto data in Azure Analysis Services without the need to replicate data to a natively supported database. While constructing high-quality semantic data models for business reports and client applications, Azure Analysis Services formulates SQL queries to retrieve data. CData Connect Cloud is equipped with optimized data processing capabilities right from the start, directing all supported SQL operations, including filters and JOINs, directly to Presto. This leverages server-side processing for swift retrieval of the requested Presto data.

Configure Presto Connectivity for AAS

Connectivity to Presto from Azure Analysis Services is made possible through CData Connect Cloud. To work with Presto data from Azure Analysis Services, we start by creating and configuring a Presto connection.

1. Log into Connect Cloud, click Connections and click Add Connection
2. Select "Presto" from the Add Connection panel
3. Enter the necessary authentication properties to connect to Presto.

   Set the Server and Port connection properties to connect, in addition to any authentication properties that may be required.

   To enable TLS/SSL, set UseSSL to true.

   Authenticating with LDAP

   In order to authenticate with LDAP, set the following connection properties:

   • AuthScheme: Set this to LDAP.
   • User: The username being authenticated with in LDAP.
   • Password: The password associated with the User you are authenticating against LDAP with.

   Authenticating with Kerberos

   In order to authenticate with KERBEROS, set the following connection properties:

   • AuthScheme: Set this to KERBEROS.
   • KerberosKDC: The Kerberos Key Distribution Center (KDC) service used to authenticate the user.
   • KerberosRealm: The Kerberos Realm used to authenticate the user with.
   • KerberosSPN: The Service Principal Name for the Kerberos Domain Controller.
   • KerberosKeytabFile: The Keytab file containing your pairs of Kerberos principals and encrypted keys.
   • User: The user who is authenticating to Kerberos.
   • Password: The password used to authenticate to Kerberos.
4. Click Create & Test
5. Navigate to the Permissions tab in the Add Presto Connection page and update the User-based permissions.

Add a Personal Access Token

If you are connecting from a service, application, platform, or framework that lacks support for OAuth authentication, you have the option to generate a Personal Access Token (PAT) for authentication purposes. It's advisable to follow best practices by creating a distinct PAT for each service to uphold access granularity.

1. Click on your username at the top right of the Connect Cloud app and click User Profile.
2. On the User Profile page, scroll down to the Personal Access Tokens section and click Create PAT.
3. Give your PAT a name and click Create.
4. The personal access token is only visible at creation, so be sure to copy it and store it securely for future use.

With the connection configured, you are ready to connect to Presto data from Visual Studio using Azure Analysis Services.

Connect to Presto in Visual Studio Using AAS

The steps below outline connecting to CData Connect Cloud from Azure Analysis Services to create a new Presto data source. You will need the Microsoft Analysis Services Project Extension installed to continue.

1. In Visual Studio, create a new project. Select Analysis Services Tabular Project.
2. In the Configure your new project dialog, enter a name for your project in the Project name field. Fill in the rest of the fields.
3. Click Create. The Tabular model designer dialog box opens. Select Workspace server and enter the address of your Azure Analysis Services server (for example, asazure://eastus.azure.windows.net/myAzureServer). Click Test Connection and sign in to your server.
4. Click OK to create the project. Your Visual Studio window should resemble the following screenshot:
5. In Visual Studio, in Tabular model Explorer, right-click Data Sources and select Import From Data Source.
6. In the Table Import Wizard, select SQL Server database and click Connect. In the Server field, enter the Virtual SQL Server endpoint and port separated by a comma: e.g., tds.cdata.com,14333
7. Click SQL Server Authentication and enter the following information:
   • User name: Enter your CData Connect Cloud username. This is displayed in the top-right corner of the CData Connect Cloud interface. For example, test@cdata.com.
   • Password: Enter the PAT you generated on the Settings page.
   Click Test Connection. If successful, choose from the Database name list and click Next.
8. On the next screen, select Current User and click Next.
9. Now, select the first option and click Next.
10. On the next screen, select a table from the list and click Preview & Filter.
11. You should now see the table from Presto populated with data.

Now that you have imported the Presto data into your data model, you are ready to deploy the project to Azure Analysis Services for use in business reports, client applications, and more.

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