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https://issues.apache.org/jira/browse/AIRFLOW-1110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16278505#comment-16278505
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Xi Wang commented on AIRFLOW-1110:
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I ran into similar issues, check if you have errors from your dag py file, e.g.
import error. This may interrupt the scanning process of Airflow in the dag
folder which result in some dags are ignored. you can verify it manually by
runing airflow list_dags to see if anything missing from the list.
> Error dag_id could not be found when dag_id exists
> --------------------------------------------------
>
> Key: AIRFLOW-1110
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1110
> Project: Apache Airflow
> Issue Type: Bug
> Components: DAG
> Affects Versions: Airflow 1.8
> Environment: Airflow 1.8, celery redis
> Reporter: laomaotou
>
> In my tag, there are four tasks with this structure below:
> [t1, t2] -> [t3, t4]
> When this tag runs, t1 and t2 run successfully, but t3 and t4 are queued, but
> with "AirflowException: dag_id could not be found.Either the dag did not
> exist or it failed to parse." And then, I retry to run task t3 and t4, there
> is no error. I don't know the reason. And this error doesn't arrive every
> time, sometime all tasks run successfully.
> Could you help me ?
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