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https://issues.apache.org/jira/browse/AIRFLOW-4922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17401075#comment-17401075
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ASF GitHub Bot commented on AIRFLOW-4922:
-----------------------------------------
potiuk edited a comment on pull request #6722:
URL: https://github.com/apache/airflow/pull/6722#issuecomment-901137418
It's because you likely have custom logging configuration which does not
derive from Airlfow's one as explained in
https://airflow.apache.org/docs/apache-airflow/stable/configurations-ref.html#schedule-after-task-execution
Make sure you start with:
```
LOGGING_CONFIG = deepcopy(DEFAULT_LOGGING_CONFIG)
```
and modify that config if you want to add custom configuration.
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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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