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https://issues.apache.org/jira/browse/AIRFLOW-4081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kaxil Naik updated AIRFLOW-4081:
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Labels: easyfix (was: documentation easyfix)
> Task failures with "Task instance's dagrun did not exist: Unknown reason."
> ---------------------------------------------------------------------------
>
> Key: AIRFLOW-4081
> URL: https://issues.apache.org/jira/browse/AIRFLOW-4081
> Project: Apache Airflow
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 1.10.2
> Environment: I'm using the latest from PyPI, but this bug was tricky
> enough to identify that seems likely to be in master too.
> Reporter: Tylar Murray
> Priority: Minor
> Labels: easyfix
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Tasks will fail with `Task instance's dagrun did not exist: Unknown reason`
> and show no log, returning only `{{*** Failed to fetch log file from worker.
> Invalid URL
> 'http://:8793/log/dag_id/task_id/2019-03-13T11:21:00+00:00/1.log': No host
> supplied` when:}}
> # {{dag `max_active_runs=1` and `catchup=False`}}
> # task remains queued (or is running?) when a 2nd dag is triggered
> This error state had me confused about "random" failing tasks, but the
> pattern now seems clear and the error should be reproducible in a clean
> environment.
> A fix should include a more informative error message and perhaps the task
> state should be set to "skipped" rather than "failed".
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