raman created AIRFLOW-3882:
------------------------------

             Summary: Optimise APIs to create DAG model from DB instead of 
calling DagBag()
                 Key: AIRFLOW-3882
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-3882
             Project: Apache Airflow
          Issue Type: Improvement
          Components: api, webserver
    Affects Versions: 1.10.2
            Reporter: raman


Currently following APIs create the Dag object by calling DagBag() on all the 
files. which is not an optimised way. There is an alternative to create a Dag 
object from DB

-> get_dag_run_state

-> get_dag_runs

-> /dags/<string:dag_id>/tasks/<string:task_id>

-> /dags/<string:dag_id>/dag_runs/<string:execution_date>/tasks/<string:task_id>

 



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