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Test live data locally using Azure Stream Analytics tools for Visual Studio (Preview)

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Azure Stream Analytics tools for Visual Studio allows you to test jobs locally from the IDE using live event streams from Azure Event Hub, IoT Hub, and Blob Storage. Live data local testing can't replace the performance and scalability testing you can perform in the cloud, but you can save time during functional testing by not having to submit to the cloud each time you want to test your Stream Analytics job. This feature is in preview and shouldn't be used for production workloads.

Testing options

The following local testing options are supported:

Input Output Job Type
Local static data Local static data Cloud/Edge
Live input data Local static data Cloud
Live input data Live output data Cloud

Local testing with live data

  1. After you've created an Azure Stream Analytics cloud project in Visual Studio, open script.asaql. The local testing uses local input and local output by default.

    Azure Stream Analytics Visual Studio local input and local output

  2. To test live data, choose Use Cloud Input from the dropdown box.

    Azure Stream Analytics Visual Studio live cloud input

  3. Set the Start Time to define when the job will start processing input data. The job might need to read input data ahead of time to ensure accurate results. The default time is set to 30 minutes ahead of the current time.

    Azure Stream Analytics Visual Studio live data start time

  4. Click Run Locally. A console window will appear with the running progress and job metrics. If you want to stop the process, you can do so manually.

    Azure Stream Analytics Visual Studio live data process window

    The output results are refreshed every three seconds with the first 500 output rows in the local run result window, and the output files are placed in your project path ASALocalRun folder. You can also open the output files by clicking Open Results Folder button in the local run result window.

    Azure Stream Analytics Visual Studio live data open results folder

  5. If you want to output the results to your cloud output sinks, choose Output to Cloud from the second dropdown box. Power BI and Azure Data Lake Storage are not supported output sinks.

    Azure Stream Analytics Visual Studio live data output to cloud

Limitations

  • Power BI and Azure Data Lake Storage are not supported output sinks due to authentication model limitations.

  • Only cloud input options have time policies support, while local input options do not.

Next steps