How to Run a Simple Airflow DAG

Question

I am totally new to Airflow. I would like to run a simple DAG at a specified date. I\'m struggling to make difference between the start date, the execution date, and backfil

Answer 1

difference between the start date ,the execution date and backfilling

Backfilling is done to run DAG explicitly to test/manually run DAG/re run a DAG which error-ed out. You do this using CLI

airflow backfill -s <> <> 
#optionally provide -1 as start_date to run it immediately

start_date is, as the name suggests, date from when the DAG definition is valid

execution_date is the date-time when it is to be run. This you provide while testing individual tasks of DAG as below

airflow test <> <> <>

what is the command to run the dag

Backfill is the command to run DAG explicitly. Otherwise you just put the DAG in the DAGBAG folder and the scheduler will run it as per the schedule defined in the DAG definition

airflow backfill -s <> <> 
#optionally provide -1 as start_date to run it immediately