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From "Nick Bauer (JIRA)" <>
Subject [jira] [Commented] (AIRFLOW-1641) Task gets stuck in queued state
Date Mon, 25 Sep 2017 19:32:00 GMT


Nick Bauer commented on AIRFLOW-1641:

Yes, we are seeing this a lot. I've determined the issue to be (at least for us) that the
dagbag import times out, and the task never runs.  specifically this line: m = imp.load_source(mod_name,
filepath) throws an exception and its handled and not re-raised.  The dag import code is reused
in other places so i am not sure if raising an exception will break other things, however
it seems to me that it should raise an exception in all cases.

> Task gets stuck in queued state
> -------------------------------
>                 Key: AIRFLOW-1641
>                 URL:
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: scheduler
>    Affects Versions: 1.8.0
>         Environment: Linux
>            Reporter: Mas
>              Labels: queued, scheduler, stuck, task
> Hello,
> I have one dag with ~20 tasks. 
> The dags runs daily and some tasks can sometime last for hours, depending on the processed
data behind.
> There are some interactions with AWS and a remote DB.
> I only use LocalExecutor.
> What this issue is about, is the fact that sometime (randomly, and without any clear
reason) one of the tasks (here also, it is random) gets stuck in "queued" state and never
starts running. 
> The manual workaround is to restart the task manually by clearing it.
> Does anyone have ideas about the issue behind, and how to avoid it for the future? 
> Thanks in advance for your help.
> PS: other people are facing the same behaviour: [link|]

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