Jan 20, 2020 · By default, Airflow uses SerialExecutor, which only runs one task at a time on a local machine. This is not advised to be done in production. Backend. Airflow uses MySQL or PostgreSQL to store the configuration as well as the state of all the DAG and task runs. By default, Airflow uses SQLite as a backend by default, so no external setup is ... Airflow allows developers, admins and operations teams to author, schedule and orchestrate workflows and jobs within an organization. While it’s main focus started with orchestrating data pipelines, it’s ability to work seamlessly outside of the Hadoop stack makes it a compelling solution to manage even traditional workloads.
The {{ }} brackets tell Airflow that this is a Jinja template, and ds is a variable made available by Airflow that is replaced by the execution date in the format YYYY-MM-DD. Thus, in the dag run stamped with 2018-06-04, this would render to:./run.sh 2018-06-04. Another useful variable is ds_nodash, where './run.sh {{ ds_nodash }}' renders to: Airflow is commonly used to process data, but has the opinion that tasks should ideally be idempotent (i.e. results of the task will be the same, and will not create duplicated data in a destination system), and should not pass large quantities of data from one task to the next (though tasks can pass metadata using Airflow's Xcom feature). For ...
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