title: Scheduling airflow dag for 30 seconds
body: <p>I am pretty new to airflow. I have a dag file which I'd like to schedule it for every 30 seconds. How can I do it? </p>
  
  <pre><code>from datetime import datetime
  from airflow import DAG
  from airflow.operators.bash_operator import BashOperator
  from airflow.operators.dummy_operator import DummyOperator
  from dependency_node import DependencyNode, resolve_dependency_to_edges
  import os
  
  FILE_NAME = os.path.basename(__file__).split('.')[0]
  
  default_args = {
    "owner": "airflow",
    "wait_for_downstream": True,
    "start_date": datetime(2019,12,19),
    "retries": 0
  }
  
  DAG_ARGS = {
    "schedule_interval": '*/1 * * * *',
    "catchup": False
  }
  </code></pre>
  
  <p>This is how my dag arguments look like and it is scheduled for 1 minute but I want to schedule it to every 30sec. </p>
  
  <p>I'd really appreciate if I can get some help</p>