[jira] [Commented] (AIRFLOW-4922) If a task crashes, host name is not committed to the database so logs aren't able to be seen in the UI

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-4922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17256547#comment-17256547 ] 

ASF GitHub Bot commented on AIRFLOW-4922:
-----------------------------------------

samgans commented on pull request #6722:
URL: https://github.com/apache/airflow/pull/6722#issuecomment-752637082


   Hi @ITriangle, @ashb.  I've stumbled upon the issue and wanna try to resolve it.
   
   Can you please tell me some more on how the FileTaskHandler is called and why it can't read the tasks URL as it has been committed during the handling of the task's failure?


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> If a task crashes, host name is not committed to the database so logs aren't able to be seen in the UI
> ------------------------------------------------------------------------------------------------------
>
>                 Key: AIRFLOW-4922
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-4922
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: logging
>    Affects Versions: 1.10.3
>            Reporter: Andrew Harmon
>            Assignee: wanghong-T
>            Priority: Major
>
> Sometimes when a task fails, the log show the following
> {code}
> *** Log file does not exist: /usr/local/airflow/logs/my_dag/my_task/2019-07-07T09:00:00+00:00/1.log*** 
> Fetching from: http://:8793/log/my_dag/my_task/2019-07-07T09:00:00+00:00/1.log*** 
> Failed to fetch log file from worker. Invalid URL 'http://:8793/log/my_dag/my_task/2019-07-07T09:00:00+00:00/1.log': No host supplied
> {code}
> I believe this is due to the fact that the row is not committed to the database until after the task finishes. https://github.com/apache/airflow/blob/a1f9d9a03faecbb4ab52def2735e374b2e88b2b9/airflow/models/taskinstance.py#L857



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