Tylar Murray created AIRFLOW-4081:
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Summary: 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
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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