Feng Lu commented on AIRFLOW-1059:

[~saguziel] Could you elaborate a bit more why orphaned tasks from backfilled 
dagruns can't be re-enqueued? 

> Reset_state_for_orphaned_task should operate in batch for the scheduler
> -----------------------------------------------------------------------
>                 Key: AIRFLOW-1059
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1059
>             Project: Apache Airflow
>          Issue Type: Improvement
>            Reporter: Alex Guziel
>            Assignee: Alex Guziel
>            Priority: Major
>             Fix For: 1.9.0
> Scheduler startup is very slow due to resetting state making a query for each 
> dag run. We should be able to do this in a constant number of queries which 
> will increase scheduler startup time significantly.

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