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Posted to commits@airflow.apache.org by "Grant Nicholas (JIRA)" <ji...@apache.org> on 2017/12/04 20:27:00 UTC

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

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

Grant Nicholas updated AIRFLOW-1884:
------------------------------------
    Summary: Ensure scheduler is crash safe for externally triggered dagruns  (was: Ensure scheduler is crash safe for externally triggered and backfilled dagruns)

> 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
>
> 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 all dagruns have orphaned tasks reset on startup of the scheduler. 



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