I need to design a data pipeline, in particular, I have some doubts regarding how to trigger it. This is the scenario:
External system stores data into google cloud storage daily
As soon a particular file is uploaded in GCS the pipeline needs to start (Airflow dag)
The point is how to check if that particular file is uploaded, I have two options in mind:
- Use cloud functions, the function will be triggered when that file has been written automatically (it is a Google cloud service), that function will notify Airflow using rest-api so the DAG can start. Please note that when the DAG is finished it will not be automatically re-executed (so no time scheduling).
- Run manually the airflow DAG with Google Cloud storage sensor operator as first node which waits for the trigger file to be written. In this case, the Airflow will be automatically executed daily.
The problem with the second option is that the sensor operator is nothing else than a while loop with a sleep, so it seems to be inefficient (I prefer to not use a polling approach). What are your thoughts about?
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