how to executescript python script in nifi
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Executing a Python script in Apache NiFi involves using the ExecuteScript processor, which allows you to run custom scripts written in various scripting languages, including Python. In this tutorial, I'll guide you through the process of setting up and executing a Python script in NiFi. We'll assume you have a basic understanding of NiFi concepts and have a NiFi instance up and running.
Open the NiFi UI in your web browser.
Drag the ExecuteScript processor from the Processor Palette to your canvas.
Connect the ExecuteScript processor to the source and destination processors as needed in your data flow.
Double-click on the ExecuteScript processor to open its configuration.
In the Properties tab, set the Script Engine property to python.
Specify the path to your Python script in the Script File property.
Configure any additional properties based on your script requirements.
Create a Python script that will be executed by the ExecuteScript processor. Save the script to a location accessible by NiFi. For example, let's create a simple Python script named example_script.py:
If your Python script requires external libraries, you might need to add them to NiFi's lib directory or use a virtual environment. Consult NiFi's documentation for more details on managing dependencies.
Start your NiFi flow, and the ExecuteScript processor will execute your Python script as data flows through it.
The process function in your Python script is the entry point, and it takes two parameters: input_stream for reading input data and output_stream for writing processed data.
Ensure that NiFi has the necessary permissions to execute the Python script and access any required resources.
Check the NiFi logs for any errors or issues during script execution.
This tutorial provides a basic setup for executing Python scripts in NiFi using the ExecuteScript processor. Adjust the configuration and script according to your specific use case and requirements.
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