[jira] [Resolved] (AIRFLOW-1884) Ensure scheduler is crash safe for externally triggered dagruns

["Bolke de Bruin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AIRFLOW-1884?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bolke de Bruin resolved AIRFLOW-1884.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.9.1

Issue resolved by pull request #2843
[https://github.com/apache/incubator-airflow/pull/2843]

> Ensure scheduler is crash safe for externally triggered dagruns
> ---------------------------------------------------------------
>
>                 Key: AIRFLOW-1884
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1884
>             Project: Apache Airflow
>          Issue Type: Bug
>            Reporter: Grant Nicholas
>            Assignee: Grant Nicholas
>             Fix For: 1.9.1
>
>
> Orphaned task instances are only reset for dagruns that are both not externally triggered and not backfilled. This violates the crash safety property of the scheduler, ie) if the scheduler crashes in the middle of one of these dagruns then tasks can be stuck in the "Queued" state forever and never executed. 
> I found the changeset this regression happened in, it is this one:
> https://issues.apache.org/jira/browse/AIRFLOW-1059
> This change reverts the special casing logic so that externally triggered dagruns have orphaned tasks reset on startup of the scheduler. Backfilled dagruns are still not crash safe, so if that needs to be fixed it will be done in another PR. 



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