raman created AIRFLOW-1934:
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Summary: Unable to Launch Example DAG if ~/AIRFLOW_HOME/dags
folder is empty
Key: AIRFLOW-1934
URL: https://issues.apache.org/jira/browse/AIRFLOW-1934
Project: Apache Airflow
Issue Type: Bug
Components: DAG
Affects Versions: Airflow 1.8
Environment: RHEL
Reporter: raman
Steps to reproduce
1. Install airflow
2. Keep the ~/{airflow_home}/dags folder empty
3. airflow initdb
4. airflow webserver and scheduler
2. Enable a DAG and trigger it manually from web UI.
Result: DAG run gets created in the dag_run table. task_instance table also get
relevant enteries but scheduler does not pick the DAG.
Workaround: Create one sample dag in the ~/{airflow_home}/dags folder and
scheduler picks it up.
The following code in jobs.py seems to be doing the trick but this code is only
triggered if there is a dag inside ~/{airflow_home}/dags folder
Function: _find_executable_task_instances
ti_query = (
session
.query(TI)
.filter(TI.dag_id.in_(simple_dag_bag.dag_ids))
.outerjoin(DR,
and_(DR.dag_id == TI.dag_id,
DR.execution_date == TI.execution_date))
.filter(or_(DR.run_id == None,
not_(DR.run_id.like(BackfillJob.ID_PREFIX + '%'))))
.outerjoin(DM, DM.dag_id==TI.dag_id)
.filter(or_(DM.dag_id == None,
not_(DM.is_paused)))
)
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