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# Amazon S3 File System Access via HDFS Adapters

## About The Samples

These samples illustrate how to access the Amazon S3 file system using the TIBCO StreamBase® File Writer for Apache Hadoop Distributed File System (HDFS) and TIBCO StreamBase® File Reader for Apache Hadoop Distributed File System (HDFS).

## 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 `s3` to narrow the list of options.

- Select S3 file system access via HDFS from the Large Data Storage and Analysis category.

- Click OK.

StreamBase Studio creates a single project containing the sample files.

## Initial Setup

Open the sample application, `FileBasic.sbapp` or `FileAdvanced.sbapp`, select the Parameters tab, and edit the value to represent:

- Your current S3 bucket

- Where you would like to store the sample data

You must also open the sample S3 configuration file, `sample_s3a.conf`, and enter your security access keys for your S3 file system. See this link for other ways to authenticate with S3: Authenticating with S3.

## Running The Basic 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 `FileBasic.sbapp` file and click the Run button. This opens the SB Test/Debug perspective and starts the module.

4. In the Manual Input view, switch the `Stream` to `Data`, then enter a string value such as `test`.

5. Click Send Data to send a data tuple to be written to the file. Repeat for as many lines as you wish.

6. In the Application Output view, observe tuples emitted on the `Status` output streams indicating actions performed on the file.

7. In the Manual Input view, switch the `Stream` to `WriteControl`, then enter `Close` into the `Command` field.

8. Click Send Data to send a control tuple, which closes the current file for writing.

9. In the Manual Input view, switch the `Stream` to `ReadControl`, then click Send Data to send a control tuple, which reads the default file.

10. Press F9 or click the Terminate EventFlow Fragment button.

11. This demo has now created a file in your S3 file system called `sample/Sample.txt` containing the lines of data you submitted.

## Running The Advanced 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 `FileAdvanced.sbapp` file and click the Run button. This opens the SB Test/Debug perspective and starts the module.

4. In the Application Output view, observe tuples emitted on the `Status` output streams indicating actions performed to the files.

5. Press F9 or click the Terminate EventFlow Fragment button.

6. This demo has now created multiple files in your S3 file system:

   1. `sample/Sample.gz` — This file is a GZip compressed file created from the `SampleIn.txt` file.

   2. `sample/Sample.gz2` — This file is a BZip2 compressed file created from the `SampleIn.txt` file.

   3. `sample/Sample.zip` — This file is a Zip compressed file created from the `SampleIn.txt` file.

   4. `sample/SampleOut.txt` — This file is an uncompressed file created from the `SampleIn.txt` file.

## 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_hdfsS3

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