In this chapter, you’ll gain a complete introduction to the components of Apache Airflow and learn how and why you should use them.

Introduction to Apache Airflow

Testing a task in Airflow

Examining Airflow commands

Airflow DAGs

Defining a simple DAG

Working with DAGs and the Airflow shell

Troubleshooting DAG creation

Airflow web interface

Starting the Airflow webserver

Navigating the Airflow UI

Examining DAGs with the Airflow UI

Intro to Airflow

What’s up DAG? Now it’s time to learn the basics of implementing Airflow DAGs. Through hands-on activities, you’ll learn how to set up and deploy operators, tasks, and scheduling.

Airflow operators

Defining a BashOperator task

Multiple BashOperators

Airflow tasks

Define order of BashOperators

Determining the order of tasks

Troubleshooting DAG dependencies

Additional operators

Using the PythonOperator

More PythonOperators

EmailOperator and dependencies

Airflow scheduling

Schedule a DAG via Python

Deciphering Airflow schedules

Troubleshooting DAG runs

Implementing Airflow DAGs

In this chapter, you’ll learn how to save yourself time using Airflow components such as sensors and executors while monitoring and troubleshooting Airflow workflows.

Airflow sensors

Sensors vs operators

Sensory deprivation

Airflow executors

Determining the executor

Executor implications

Debugging and troubleshooting in Airflow

DAGs in the bag

Missing DAG

SLAs and reporting in Airflow

Defining an SLA

Defining a task SLA

Generate and email a report

Adding status emails

Maintaining and monitoring Airflow workflows

Put it all together. In this final chapter, you’ll apply everything you've learned to build a production-quality workflow in Airflow.

Mit Templates arbeiten

from airflow import DAG
from airflow.operators.bash import BashOperator
from datetime import datetime

default_args = {
  'start_date': datetime(2023, 4, 15),
}

cleandata_dag = DAG('cleandata',
                    default_args=default_args,
                    schedule_interval='@daily')

# Create a templated command to execute
# 'bash cleandata.sh datestring'


# Modify clean_task to use the templated command
clean_task = BashOperator(task_id='cleandata_task',
                          bash_command='bash cleandata.sh datestring',
                          dag=cleandata_dag)


from airflow import DAG
from airflow.operators.bash import BashOperator
from datetime import datetime

default_args = {
  'start_date': datetime(2023, 4, 15),
}

cleandata_dag = DAG('cleandata',
                    default_args=default_args,
                    schedule_interval='@daily')

# Create a templated command to execute
# 'bash cleandata.sh datestring'
templated_command = """
bash cleandata.sh {{ ds_nodash }}
"""

# Modify clean_task to use the templated command
clean_task = BashOperator(task_id='cleandata_task',
                          bash_command=templated_command,
                          dag=cleandata_dag)


Einen templated BashOperator erstellen

from airflow import DAG
from airflow.operators.bash import BashOperator
from datetime import datetime

default_args = {
  'start_date': datetime(2023, 4, 15),
}

cleandata_dag = DAG('cleandata',
                    default_args=default_args,
                    schedule_interval='@daily')

# Modify the templated command to handle a
# second argument called filename.
templated_command = """
  bash cleandata.sh {{ ds_nodash }} ____
"""

# Modify clean_task to pass the new argument
clean_task = BashOperator(task_id='cleandata_task',
                          bash_command=templated_command,
                          params={'filename': '____'},
                          dag=cleandata_dag)

# Create a new BashOperator clean_task2
clean_task2 = BashOperator(task_id='cleandata_task2',
                           ____,
                           ____,
                           ____)
                           
# Set the operator dependencies
____


from airflow import DAG
from airflow.operators.bash import BashOperator
from datetime import datetime

default_args = {
  'start_date': datetime(2023, 4, 15),
}

cleandata_dag = DAG('cleandata',
                    default_args=default_args,
                    schedule_interval='@daily')

# Modify the templated command to handle a
# second argument called filename.
templated_command = """
  bash cleandata.sh {{ ds_nodash }} {{ params.filename }}
"""

# Modify clean_task to pass the new argument
clean_task = BashOperator(task_id='cleandata_task',
                          bash_command=templated_command,
                          params={'filename': 'salesdata.txt'},
                          dag=cleandata_dag)
                          
# Create a new BashOperator clean_task2
clean_task2 = BashOperator(task_id='cleandata_task2',
                           bash_command=templated_command,
                           params={'filename': 'supportdata.txt'},
                           dag=cleandata_dag)
                           
# Set the operator dependencies
clean_task >> clean_task2


Templates mit mehreren Argumenten

Mehr Vorlagen

from airflow import DAG
from airflow.operators.bash import BashOperator
from datetime import datetime

filelist = [f'file{x}.txt' for x in range(30)]

default_args = {
  'start_date': datetime(2020, 4, 15),
}

cleandata_dag = DAG('cleandata',
                    default_args=default_args,
                    schedule_interval='@daily')

# Modify the template to handle multiple files in a 
# single run.
templated_command = """
  <% for filename in ____ %>
  bash cleandata.sh {{ ds_nodash }} {{ filename }};
  <% endfor %>
"""

# Modify clean_task to use the templated command
clean_task = BashOperator(task_id='cleandata_task',
                          bash_command=templated_command,
                          params={'filenames': ____},
                          dag=cleandata_dag)


from airflow import DAG
from airflow.operators.bash import BashOperator
from datetime import datetime

filelist = [f'file{x}.txt' for x in range(30)]

default_args = {
  'start_date': datetime(2020, 4, 15),
}

cleandata_dag = DAG('cleandata',
                    default_args=default_args,
                    schedule_interval='@daily')

# Modify the template to handle multiple files in a 
# single run.
templated_command = """
  <% for filename in params.filenames %>
  bash cleandata.sh {{ ds_nodash }} {{ filename }};
  <% endfor %>
"""

# Modify clean_task to use the templated command
clean_task = BashOperator(task_id='cleandata_task',
                          bash_command=templated_command,
                          params={'filenames': filelist},
                          dag=cleandata_dag)
                          


Listen mit Templates verwenden

Parameteroptionen verstehen

from airflow import DAG
from airflow.operators.email import EmailOperator
from datetime import datetime

# Create the string representing the html email content
html_email_str = """
Date: {{ ____ }}
Username: {{ ____ }}
"""

email_dag = DAG('template_email_test',
                default_args={'start_date': datetime(2023, 4, 15)},
                schedule_interval='@weekly')
                
email_task = EmailOperator(task_id='email_task',
                           to='testuser@datacamp.com',
                           subject="{{ ____ }}",
                           html_content=____,
                           params={'____': 'testemailuser'},
                           dag=email_dag)


from airflow import DAG
from airflow.operators.email import EmailOperator
from datetime import datetime

# Create the string representing the html email content
html_email_str = """
Date: {{ ds }}
Username: {{ params.username }}
"""

email_dag = DAG('template_email_test',
                default_args={'start_date': datetime(2023, 4, 15)},
                schedule_interval='@weekly')
                
email_task = EmailOperator(task_id='email_task',
                           to='testuser@datacamp.com',
                           subject="{{ macros.uuid.uuid4() }}",
                           html_content=html_email_str,
                           params={'username': 'testemailuser'},
                           dag=email_dag)


Vorlagenbasierte E-Mails senden

Verzweigung

Einen BranchPythonOperator definieren

Fehlerbehebung bei Branching

Eine Produktions-Pipeline erstellen

from airflow import DAG
from airflow.sensors.filesystem import FileSensor

# Import the needed operators
from airflow.operators.bash import ____
from airflow.operators.python import ____
from datetime import date, datetime

def process_data(**context):
  file = open('/home/repl/workspace/processed_data.tmp', 'w')
  file.write(f'Data processed on {date.today()}')
  file.close()

    
dag = DAG(dag_id='etl_update', default_args={'start_date': datetime(2023,4,1)})

sensor = FileSensor(task_id='sense_file', 
                    filepath='/home/repl/workspace/startprocess.txt',
                    poke_interval=5,
                    timeout=15,
                    dag=dag)

bash_task = BashOperator(task_id='cleanup_tempfiles', 
                         bash_command='rm -f /home/repl/*.tmp',
                         dag=dag)

python_task = PythonOperator(task_id='run_processing', 
                             python_callable=process_data,
                             dag=dag)

sensor >> bash_task >> python_task


from airflow import DAG
from airflow.sensors.filesystem import FileSensor

# Import the needed operators
from airflow.operators.bash import BashOperator
from airflow.operators.python import PythonOperator
from datetime import date, datetime

def process_data(**context):
  file = open('/home/repl/workspace/processed_data.tmp', 'w')
  file.write(f'Data processed on {date.today()}')
  file.close()

    
dag = DAG(dag_id='etl_update', default_args={'start_date': datetime(2023,4,1)})

sensor = FileSensor(task_id='sense_file', 
                    filepath='/home/repl/workspace/startprocess.txt',
                    poke_interval=5,
                    timeout=15,
                    dag=dag)

bash_task = BashOperator(task_id='cleanup_tempfiles', 
                         bash_command='rm -f /home/repl/*.tmp',
                         dag=dag)

python_task = PythonOperator(task_id='run_processing', 
                             python_callable=process_data,
                             dag=dag)

sensor >> bash_task >> python_task


Erstellen einer Produktionspipeline #1

from airflow import DAG
from airflow.sensors.filesystem import FileSensor
from airflow.operators.bash import BashOperator
from airflow.operators.python import PythonOperator
from dags.process import process_data
from datetime import timedelta, datetime

# Update the default arguments and apply them to the DAG
default_args = {
  'start_date': datetime(2023,1,1),
  ____
}

dag = DAG(dag_id='etl_update', default_args=default_args)

sensor = FileSensor(task_id='sense_file', 
                    filepath='/home/repl/workspace/startprocess.txt',
                    ____,
                    dag=dag)

bash_task = BashOperator(task_id='cleanup_tempfiles', 
                         bash_command='rm -f /home/repl/*.tmp',
                         dag=dag)

python_task = PythonOperator(task_id='run_processing', 
                             python_callable=process_data,
                             ____
                             dag=dag)

sensor >> bash_task >> python_task


from datetime import date

def process_data(**kwargs):

    file = open("/home/repl/workspace/processed_data-" + kwargs['ds'] + ".tmp", "w")
    
    file.write(f"Data processed on {date.today()}")
    
    file.close()
  


from airflow import DAG
from airflow.sensors.filesystem import FileSensor
from airflow.operators.bash import BashOperator
from airflow.operators.python import PythonOperator
from dags.process import process_data
from datetime import timedelta, datetime

# Update the default arguments and apply them to the DAG
default_args = {
  'start_date': datetime(2023,1,1),
  'sla': timedelta(minutes=90)
}

dag = DAG(dag_id='etl_update', default_args=default_args)

sensor = FileSensor(task_id='sense_file', 
                    filepath='/home/repl/workspace/startprocess.txt',
                    poke_interval=45,
                    dag=dag)

bash_task = BashOperator(task_id='cleanup_tempfiles', 
                         bash_command='rm -f /home/repl/*.tmp',
                         dag=dag)

python_task = PythonOperator(task_id='run_processing', 
                             python_callable=process_data,
                             provide_context=True,
                             dag=dag)

sensor >> bash_task >> python_task


Erstellen einer Produktions-Pipeline #2

from airflow import DAG
from airflow.sensors.filesystem import FileSensor
from airflow.operators.bash import BashOperator
from airflow.operators.python import PythonOperator
from airflow.operators.python import ____
from airflow.operators.empty import EmptyOperator
from airflow.operators.____ import EmailOperator
from dags.process import process_data
from datetime import datetime, timedelta

# Update the default arguments and apply them to the DAG.

default_args = {
  'start_date': datetime(2023,1,1),
  'sla': timedelta(minutes=90)
}
    
dag = DAG(dag_id='etl_update', default_args=default_args)

sensor = FileSensor(task_id='sense_file', 
                    filepath='/home/repl/workspace/startprocess.txt',
                    poke_interval=45,
                    dag=dag)

bash_task = BashOperator(task_id='cleanup_tempfiles', 
                         bash_command='rm -f /home/repl/*.tmp',
                         dag=dag)

python_task = PythonOperator(task_id='run_processing', 
                             python_callable=process_data,
                             provide_context=True,
                             dag=dag)

email_subject="""
  Email report for {{ params.department }} on {{ ds_nodash }}
"""

email_report_task = EmailOperator(task_id='email_report_task',
                                  to='sales@mycompany.com',
                                  subject=email_subject,
                                  html_content='',
                                  params={____: 'Data subscription services'},
                                  dag=dag)

no_email_task = EmptyOperator(task_id='no_email_task', dag=dag)

def check_weekend(**kwargs):
    dt = datetime.strptime(kwargs['execution_date'],"%Y-%m-%d")
    # If dt.weekday() is 0-4, it's Monday - Friday. If 5 or 6, it's Sat / Sun.
    if (dt.weekday() < 5):
        return ____
    else:
        return ____
    
branch_task = BranchPythonOperator(task_id='check_if_weekend',
                                   python_callable=____,
                                   ____=True,                                
                                   dag=dag)

sensor >> bash_task >> python_task

python_task >> branch_task >> [email_report_task, no_email_task]

from datetime import date

def process_data(**kwargs):
    file = open("/home/repl/workspace/processed_data-" + kwargs['ds'] + ".tmp", "w")
    file.write(f"Data processed on {date.today()}")
    file.close()
  
  


from airflow import DAG
from airflow.sensors.filesystem import FileSensor
from airflow.operators.bash import BashOperator
from airflow.operators.python import PythonOperator
from airflow.operators.python import BranchPythonOperator
from airflow.operators.empty import EmptyOperator
from airflow.operators.email import EmailOperator
from dags.process import process_data
from datetime import datetime, timedelta

# Update the default arguments and apply them to the DAG.

default_args = {
  'start_date': datetime(2023,1,1),
  'sla': timedelta(minutes=90)
}
    
dag = DAG(dag_id='etl_update', default_args=default_args)

sensor = FileSensor(task_id='sense_file', 
                    filepath='/home/repl/workspace/startprocess.txt',
                    poke_interval=45,
                    dag=dag)

bash_task = BashOperator(task_id='cleanup_tempfiles', 
                         bash_command='rm -f /home/repl/*.tmp',
                         dag=dag)

python_task = PythonOperator(task_id='run_processing', 
                             python_callable=process_data,
                             provide_context=True,
                             dag=dag)

email_subject="""
  Email report for {{ params.department }} on {{ ds_nodash }}
"""

email_report_task = EmailOperator(task_id='email_report_task',
                                  to='sales@mycompany.com',
                                  subject=email_subject,
                                  html_content='',
                                  params={'department': 'Data subscription services'},
                                  dag=dag)

no_email_task = EmptyOperator(task_id='no_email_task', dag=dag)

def check_weekend(**kwargs):
    dt = datetime.strptime(kwargs['execution_date'],"%Y-%m-%d")
    # If dt.weekday() is 0-4, it's Monday - Friday. If 5 or 6, it's Sat / Sun.
    if (dt.weekday() < 5):
        return 'email_report_task'
    else:
        return 'no_email_task'
    
branch_task = BranchPythonOperator(task_id='check_if_weekend',
                                   python_callable=check_weekend,
                                   provide_context=True,
                                   dag=dag)

sensor >> bash_task >> python_task

python_task >> branch_task >> [email_report_task, no_email_task]

Die letzten Änderungen an deiner Pipeline vornehmen

Glückwunsch!

Building production pipelines in Airflow

Jetzt aktualisiert auf Apache Airflow 2.7 – Daten nach Zeitplan bereitzustellen, kann ein manueller Prozess sein. Du schreibst Skripte, pflegst komplexe Cron-Jobs und probierst verschiedene Wege aus, um ständig wechselnde Anforderungen zu erfüllen – und im Team wird die Verwaltung noch kniffliger. Apache Airflow nimmt dir diese Kopfschmerzen, indem es deinen Workflows Planung, Fehlerbehandlung und Reporting hinzufügt. In diesem Kurs lernst du die Grundlagen von Apache Airflow und wie du komplexe Data-Engineering-Pipelines produktiv umsetzt. Außerdem lernst du, wie du Directed Acyclic Graphs (DAGs) nutzt, Data-Engineering-Workflows automatisierst und Aufgaben im Data Engineering einfach und wiederholbar implementierst – damit du einen kühlen Kopf bewahrst.

Intermediate Python

Introduction to Shell

Lerne, Daten-Workflows mit Airflow und Python zu planen, Fehler zu behandeln und Berichte zu erstellen.

Einführung in Apache Airflow mit Python

Dieser Kurs zeigt dir, wie du Data-Engineering-Workflows implementierst und planst.

Listen mit Templates verwenden

Einführung in Apache Airflow mit Python

Interaktive Übung