[jira] [Assigned] (AIRFLOW-1464) Improve performance on getting dag run tis in backfill job

["Chao-Han Tsai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AIRFLOW-1464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chao-Han Tsai reassigned AIRFLOW-1464:
--------------------------------------

    Assignee: Chao-Han Tsai

> Improve performance on getting dag run tis in backfill job
> ----------------------------------------------------------
>
>                 Key: AIRFLOW-1464
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1464
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: backfill
>            Reporter: Edgar Rodriguez
>            Assignee: Chao-Han Tsai
>            Priority: Major
>
> Improve the way task instances are retrieved, using batch query on TIs. 
> The following code snippet needs to be improved:
> {code}
> for ti in dag_run.get_task_instances():
>     # all tasks part of the backfill are scheduled to run
>     if ti.state == State.NONE:
>         ti.set_state(State.SCHEDULED, session=session)
> {code}



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