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From "Yati (JIRA)" <>
Subject [jira] [Created] (AIRFLOW-1488) Add a sensor operator to wait on DagRuns
Date Sun, 06 Aug 2017 12:16:03 GMT
Yati created AIRFLOW-1488:

             Summary: Add a sensor operator to wait on DagRuns
                 Key: AIRFLOW-1488
             Project: Apache Airflow
          Issue Type: New Feature
          Components: contrib, operators
            Reporter: Yati
            Assignee: Yati

The [ExternalTaskSensor|]
operator already allows for encoding dependencies on tasks in external DAGs. However, when
you have teams, each owning multiple small-to-medium sized DAGs, it is desirable to be able
to wait on an external DagRun as a whole. This allows the owners of an upstream DAG to refactor
their code freely by splitting/squashing task responsibilities, without worrying about dependent
DAGs breaking.

I'll now enumerate the easiest ways of achieving this that come to mind:

* Make all DAGs always have a join DummyOperator in the end, with a task id that follows some
convention, e.g., "{{ dag_id }}.__end__".
* Make ExternalTaskSensor poke for a DagRun instead of TaskInstances when the external_task_id
argument is None.
* Implement a separate DagRunSensor operator.

After considerations, we decided to implement a separate operator, which we've been using
in the team for our workflows, and I think it would make a good addition to contrib.

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