Contents
This sample demonstrates the usage of the Spotfire Streaming 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.
You must open the XMLFileWriterTest.sbappsrc/main/eventflow/ folder. 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.
packageName
In StreamBase Studio, import this sample with the following steps:
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From the top-level menu, select >.
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Enter
hdfsto narrow the list of options. -
Select HDFS XML file output adapter from the Large Data Storage and Analysis category.
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Click .
StreamBase Studio creates a project for the sample.
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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 > from the context menu.
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Open the
src/main/eventflow/folder.packageName -
Open the
XMLFileWriterTest.sbappfile. In the EventFlow editor, click theXMLFileWriteradapter icon to open its Properties view. -
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.
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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 module.
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In the SB Test/Debug perspective, select the Manual Input tab.
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Enter a valid integer for a and click .
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When done, press F9 or click the
Terminate EventFlow Fragment button.
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The file specified in Parameters HDFS_FILE_PATH will now contain tuples formatted as follows:
<tuple> <a>2</a> </tuple>
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_hdfsxmlfilewriterSee Default Installation Directories for the default location of studio-workspace on your system.