Krzysztof Madejski created AIRFLOW-7083:
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Summary: Improve Concepts -> Trigger Rules documentation
Key: AIRFLOW-7083
URL: https://issues.apache.org/jira/browse/AIRFLOW-7083
Project: Apache Airflow
Issue Type: Improvement
Components: documentation
Affects Versions: 1.10.9
Reporter: Krzysztof Madejski
I find documentation on
[https://airflow.apache.org/docs/stable/concepts.html#trigger-rules] quite
confusing.
By all_failed is mentioned "all parents are in a failed or upstream_failed
state". No other rule has such detailed information.
For example: "one_failed: fires as soon as at least one parent has failed, it
does not wait for all parents to be done". Does it mean that at least one
parent is in `failed` state? Or is task fired also if one is in
`upstream_failed` state?
"Skipped tasks will cascade through trigger rules" is confusing. What does
"cascade" exactly mean? How is state propagated?
Also: Is "none_failed" and "all_succeeded" actually testing the same condition?
If not, what is the difference.
Finally:
* the documentation does not mention how is the state of a DAG computed. Is it
an all_succeeded rule taking as parents all the leaf nodes of the DAG?
* documentations uses `state` and `status` words interchangeably. Please
decide on one.
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