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from airflow import DAG
from airflow.operators import BashOperator
from datetime import datetime, timedelta
# Following are defaults which can be overridden later on
default_args = {
'owner': 'manasi',
'depends_on_past': False,
'start_date': datetime(2016, 4, 15),
'email': ['manasidalvi14@gmail.com'],
'email_on_failure': False,
'email_on_retry': False,
'retries': 1,
'retry_delay': timedelta(minutes=1),
}
dag = DAG('Helloworld', default_args=default_args)
# t1, t2, t3 and t4 are examples of tasks created using operators
t1 = BashOperator(
task_id='task_1',
bash_command='echo "Hello World from Task 1"',
dag=dag)
t2 = BashOperator(
task_id='task_2',
bash_command='echo "Hello World from Task 2"',
dag=dag)
t3 = BashOperator(
task_id='task_3',
bash_command='echo "Hello World from Task 3"',
dag=dag)
t4 = BashOperator(
task_id='task_4',
bash_command='echo "Hello World from Task 4"',
dag=dag)
t2.set_upstream(t1)
t3.set_upstream(t1)
t4.set_upstream(t2)
t4.set_upstream(t3)