HDFS XML File Writer Output Adapter Sample

Contents

About This Sample
Initial Setup
Importing This Sample into StreamBase Studio
Running XMLFileWriterTest.sbapp in StreamBase Studio
Sample Location

About This Sample

This sample demonstrates the usage of the TIBCO StreamBase® XML File Writer Adapter for Apache Hadoop Distributed File System (HDFS), which is an embedded adapter suitable for streaming tuples to a text file formatted with XML tags.

Initial Setup

You must open the XMLFileWriterTest.sbapp file and select the Parameters tab and edit the value to represent both your current HDFS setup and where you would like to store the sample data. The sample file is located in sample_adapter_embedded_hdfsxmlfilewriter → src/main/eventflow → com.sample.adapter.hdfsxmlfilewriter

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.

  • Type hdfs to narrow the list of options.

  • Select hdfsxmlfilewriter from the Large Data Storage and Analysis category.

  • Click OK.

StreamBase Studio creates a project for the sample.

Running XMLFileWriterTest.sbapp in StreamBase Studio

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

  2. Open the src/main/eventflow folder.

  3. Open the package folder (most samples contain a single package folder. Open the top-level package folder if your sample contains more than one folder).

  4. Open the named application file. In the EventFlow editor, click the XMLFileWriter adapter icon to open its Properties view.

  5. In the Adapter Properties tab, change File Name to point to a location on your machine where you want the log to be written when the application is run.

  6. Make sure the application is the currently active tab in the EventFlow Editor.

    Click the Run button. This opens the SB Test/Debug perspective and starts the application.

  7. In the SB Test/Debug perspective, select the Manual Input tab.

  8. Enter a valid integer for a and click Send Data.

  9. When done, press F9 or click the Stop Running Application button.

  10. The file specified in Parameters HDFS_FILE_PATH will now contain tuples formatted as follows: 

    <tuple>
<a>2</a>
</tuple>

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_adapter_embedded_hdfsxmlfilewriter

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