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# Apache Kudu Operator Sample

## Sample Overview

This topic describes how to run the TIBCO StreamBase® for Apache Kudu operator sample application, which illustrates how to use the operators with a Kudu database cluster. For more information about this operator, see Using the Apache Kudu Operators.

This sample includes a number of Kudu operators, which by default connect to a Kudu cluster named `Test Cluster`, which is assumed to already be running on localhost. In addition, you should see a table called `myTable` created on the Kudu cluster with the following fields:

- id (key) as INT32

- firstName as STRING

- lastName as STRING

- accountNumber as INT64

- balance as DOUBLE

Once connected, use the sample to read and write to the table using the various operators.

## Importing This Sample into StreamBase Studio

In StreamBase Studio, import this sample with the following steps:

- From the top-level menu, select File → Load StreamBase Sample.

- Enter `kudu` to narrow the list of options.

- Select Apache Kudu Operators from the Large Data Storage and Analysis category.

- Click OK.

StreamBase Studio creates a single project for the Kudu Operator samples in your current Studio workspace.

## Running This Sample in StreamBase Studio

The steps to run this sample in Studio are as follows:

1. In the Project Explorer view, open the sample you just loaded.

   If you see red marks on a project folder, wait a moment for the project to load its features.

   If the red marks do not resolve themselves after a minute, select the project, right-click, and select Maven → Update Project from the context menu.

2. Open the `src/main/eventflow/`packageName`` folder.

3. Open the `kudu.sbapp` file and click the Run button. This opens the SB Test/Debug perspective and starts the module.

4. In the Manual Input view, select the `DoInsert` input stream.

5. Enter the following values:

   - `row.id`: `1`

   - `row.firstName`: `Jim`

   - `row.lastName`: `Morrison`

   - `row.accountNumber`: `11`

   - `row.balance`: `1111.11`

   Click Send Data to add the row to the table, and observe that the `InsertResults` output stream received a tuple indicating that the operation has succeeded.

6. In the Manual Input view, select the `DoRowScan` input stream.

7. Enter the following values:

   - `predicates.lastName.eq`: `Morrison`

   Click Send Data to send the query, and observe that the `ScannerResults` output stream received a tuple with the results from the query ― specifically, the row that was added to the table earlier. One more tuple is then emitted, with its `row` field set to `null`, to indicate the end of the query.

8. You may similarly Delete rows and issue UPDATE and UPSERT queries using the DoDelete, DoUpdate and DoUpsert input streams, respectively.

9. When done, press F9 or click the Terminate EventFlow Fragment button.

## This Sample's Files

This sample contains the following files:

- The sample EventFlow application, `kudu.sbapp`.

- A corresponding `adapter-configurations.xml` file, which the StreamBase Server uses to configure the connection to the Kudu cluster.

## Sample Location

When you load the sample into StreamBase Studio, Studio copies the sample project's files to your Studio workspace, which is normally part of your home directory, with full access rights.

### Important

Load this sample in StreamBase Studio, and thereafter use the Studio workspace copy of the sample to run and test it, even when running from the command prompt.

Using the workspace copy of the sample avoids permission problems. The default workspace location for this sample is:

    studio-workspace/sample_kudu

See Default Installation Directories for the default location of `studio-workspace` on your system.