[jira] [Created] (AIRFLOW-904) UPSTREAM_FAILED tasks should run when their upstream task changes state

["Dan Davydov (JIRA)" <ji...@apache.org>]

Dan Davydov created AIRFLOW-904:
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             Summary: UPSTREAM_FAILED tasks should run when their upstream task changes state
                 Key: AIRFLOW-904
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-904
             Project: Apache Airflow
          Issue Type: Bug
            Reporter: Dan Davydov


Right now if you have a task that depends on UPSTREAM_FAILED and the UPSTREAM_FAILED task is deleted the upstream tasks will not get kicked off.

Two ideas to solve this:
1. Get rid of the UPSTREAM_FAILED state (it can be inferred from upstream tasks)
2. Make active dagruns see if UPSTREAM_FAILED every run (in case their upstream tasks changed state).

We should be particularly careful of all of the logic in various places in the codebase that uses the UPSTREAM_FAILED state since the new behavior could affect it.

[~bolke] [~artwr]



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