HDFS File Writer and File System Adapter Sample

Contents

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

About This Sample

This sample illustrates the use of the TIBCO StreamBase® File System Adapter for Apache HDFS. The information provided in this guide walks you through the sample setup to run against your HDFS installation.

Initial Setup

To access the required files, you must also open the Sample.sbapp, select the Parameters tab, and edit the HDFS_FILE_PATH and HDFS_USER values to represent your HDFS setup.

Running This Sample in StreamBase Studio

  1. In the Package Explorer, double-click to open the Sample.sbapp application. Make sure the application is the currently active tab in the EventFlow Editor.

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

  3. In the Manual Input view, select OpenFile, and click Send Data to send the default tuple.

  4. In the Application Output view, observe tuples emitted on the WriteStatus output stream with information about the file open action.

  5. In the Manual Input view, select CloseFile, click Send Data to send the default tuple.

  6. In the Application Output view, observe tuples emitted on the WriteStatus output stream with information about the file close action.

  7. In the Manual Input view, select DeleteControl, click Send Data to send the default tuple.

  8. In the Application Output view, observe tuples emitted on the DeleteStatus output stream with information about the file delete action.

  9. Press F9 or click the Stop Running Application button.

Importing This Sample into StreamBase Studio

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

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

  • Select Apache Hadoop Distributed File System (HDFS) Adapters from the StreamBase Standard Adapters category.

  • Click OK.

StreamBase Studio creates a single project containing the sample files.

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 the permission problems that can occur when trying to work with the initially installed location of the sample. The default workspace location for this sample is: 

studio-workspace/sample_adapter_embedded_hdfs

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

In the default TIBCO StreamBase installation, this sample's files are initially installed in:

streambase-install-dir/sample/adapter/embedded/hdfs

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