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https://issues.apache.org/jira/browse/AIRFLOW-1641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16213027#comment-16213027
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Nick Bauer commented on AIRFLOW-1641:
-------------------------------------

yes, airflow.cfg:
dagbag_import_timeout = 30

30 is the default.

or via environment variables:
export AIRFLOW__CORE_DAGBAG_IMPORT_TIMEOUT=30

Take a look at the log for your queued task that is stuck.  It did not occur to 
me that a queued task would even have a log, but once I looked at it, it was 
easy to identify if it the issue was due to a timeout.

Even so, the task should fail instead of stay "queued", or retry depending on 
your settings, possibly email if that is setup.


> Task gets stuck in queued state
> -------------------------------
>
>                 Key: AIRFLOW-1641
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1641
>             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|https://stackoverflow.com/questions/45853013/airflow-tasks-get-stuck-at-queued-status-and-never-gets-running]



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