Apache Airflow is a very popular open-source workflow management platform. Here's a breakdown of what it is and why it's important
- Airflow allows you to programmatically author, schedule, and monitor workflows. This means you can define complex sequences of tasks and automate their execution.
- Workflows in Airflow are represented as DAGs. A DAG is a collection of tasks with dependencies, visualized as a graph where the tasks are nodes and the dependencies are edges. This helps you understand the flow of your processes.
- Airflow workflows are defined in Python, providing flexibility and allowing for dynamic workflow generation
Concepts of Airflow:
DAG:
While DAGs describe how to run a workflow, Operators
determine what actually gets done by a task.
Operator: An operator describes a single task in a workflow.
Example :
BashOperator
- executes a bash commandPythonOperator
- calls an arbitrary Python functionEmailOperator
- sends an emailSimpleHttpOperator
- sends an HTTP requestMySqlOperator
,SqliteOperator
,PostgresOperator
,MsSqlOperator
,OracleOperator
,JdbcOperator
, etc. - executes a SQL commandSensor
- an Operator that waits (polls) for a certain time, file, database row, S3 key, etc…
Composer is the environment in GCP where we can run Airflow.
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