How I used Luigi Pipeline for Openstack Jobs

Luigi has 3 main functions for you to start with as a beginner.

def output(): When you work on a set of file, you possibly only might be updating a file or creating a new file. That has to happen inside this function. Luigi checks the output function before any other function. If luigi doesnt get an output function, Luigi throws a warning UserWarning: Task without outputs has no custom complete() method.

So Luigi will will check the output function and the file that you have added to the function. If the file exists and is unchanged, luigi will not execute the rest of the code.

def requires() : This function is used when you have a dependency that needs to be fulfilled before running the task or code

def run(): The main logic of the code goes here. Once Luigi verifies that the requirements are fulfilled (from def requires()) , it runs the code rest of the code.

Lets see a basic code.

What will the output in Luigi looks like?

So now you can see how Luigi is going to work. Lets take it to the next level. Luigi has great work pipeline with Hadoop and db jobs but we want to make use of it for Openstack. Lets see a dummy framework of how we can create an instance with the same.

Try to run the code and check how Luigi works for this. If stack already exists, you get following output.

If stack doesnt exist, you can expect following output.

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