HDFS File Reader Input Adapter Sample

About This Sample

This adapter sample illustrates the use of the TIBCO StreamBase® Text File Reader Adapter for Apache Hadoop Distributed File System (HDFS) by reading a file and emitting a tuple that contains the file's contents in a string field.

Initial Setup

The file used in this sample MyFile.txt needs to be placed on your HDFS file system before this sample will be able to run.

You must also open the filereader.sbapp and select the Parameters tab and edit the HDFS_FILE_PATH and HDFS_USER values to represent your HDFS setup to be able to access the required files.

Running This Sample in StreamBase Studio

  1. In the Package Explorer, double-click to open the filereader.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, click Send Data to send the default null tuple.

  4. In the Application Output view, observe tuples emitted on the Status and Data output streams, the latter of which contains the contents of the configured default file, MyFile.txt.

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

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_hdfsfilereader

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/hdfsfilereader

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