HDFS Binary File Reader/Writer Adapter Sample

About This Sample

This sample demonstrates the use of the TIBCO StreamBaseĀ® Binary File Reader and Writer Adapters for Apache HDFS. HDFS is the well-known acronym for Apache's Hadoop Distributed File System.

Initial Setup

You must open the sample application, binaryrw.sbapp, in the src/main/eventflow/packageName folder. Select the Parameters tab and edit the HDFS_FILE_PATH and HDFS_USER to represent:

  • your current HDFS setup

  • where you would like to store the sample data

Importing This Sample into StreamBase Studio

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

  • From the top-level menu, click File>Import Samples and Community Content.

  • Enter binary to narrow the list of options.

  • Select HDFS binary file input/output adapters from the Large Data Storage and Analysis category.

  • Click Import Now.

StreamBase Studio creates a project for this sample.

Running This Sample in StreamBase Studio

  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 binaryrw.sbapp file and click the Run button. This opens the SB Test/Debug perspective and starts the module.

  4. In the Project Explorer view, open the src/main/resources folder and double-click myfile.csv to see the CSV records that will be converted to binary.

  5. From the SB Test/Debug perspective, in the Manual Input view, select the DoWrite input stream and click Send Data.

  6. Look for tuples emitted on the BinaryDataWritten output stream and observe they contain the values from myfile.csv.

  7. Select the DoRead input stream and click Send Data.

  8. Look for tuples emitted on the BinaryDataRead output stream and observe they contain the values from myfile.csv.

  9. Select the DoDelete input stream and click Send Data.

  10. Look for tuples emitted on the DeleteStatus output stream to confirm the file was deleted.

  11. When done, press F9 or click the Terminate EventFlow Fragment 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_hdfsbinaryrw

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