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https://issues.apache.org/jira/browse/AIRFLOW-1627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Riccomini resolved AIRFLOW-1627.
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Resolution: Fixed
Issue resolved by pull request #2620
[https://github.com/apache/incubator-airflow/pull/2620]
> 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
> Fix For: 1.9.0
>
>
> 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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