[jira] [Work started] (AIRFLOW-1627) SubDagOperator initialization should only query pools when necessary

["Daniel Huang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AIRFLOW-1627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on AIRFLOW-1627 started by Daniel Huang.
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> SubDagOperator initialization should only query pools when necessary
> --------------------------------------------------------------------
>
>                 Key: AIRFLOW-1627
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1627
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: operators, subdag
>            Reporter: Daniel Huang
>            Assignee: Daniel Huang
>            Priority: Minor
>
> If a SubDagOperator is assigned to a pool, it queries db for pool info to ensure there is no pool conflict with one of its tasks when only 1 slot remains. However, we should check that there's a possible conflict (a task in the subdag is in the same pool as the subdag) before actually querying for pools.
> I have a DAG with hundreds of subdags and I found that the pool conflict check was taking up a fair chunk of time when processing the DAG file.
> Relevant code: https://github.com/apache/incubator-airflow/blob/a81c153cc48e4c99a9e0a5047990b84c5d07e3cb/airflow/operators/subdag_operator.py#L60-L81



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