kaxil opened a new pull request #6519: [AIRFLOW-5869] BugFix: Creating DagRuns fails for Deserialized tasks … URL: https://github.com/apache/airflow/pull/6519 …with no start_date Make sure you have checked _all_ steps below. ### Jira - https://issues.apache.org/jira/browse/AIRFLOW-5869 ### Description - [ ] Here are some details about my PR, including screenshots of any UI changes: Deserialized operators do not always have start_date set. That, for instance, breaks triggering dags. See the code from DAG.create_dagrun(): ``` run = DagRun(...) session.add(run) session.commit() run.dag = self run.verify_integrity(session=session) # this validation fails because run assumes that all operators have start_date set run.refresh_from_db() ``` One of the optimisation (https://github.com/coufon/airflow/commit/b5ee858f44f55818c589cf2c8bf3866fa5d50e30) we did as part of DAG Serialization was to not store dates in tasks if they have a matching date (start_date or end_date) in DAG. Unfortunately, when triggering DAG containing such tasks, it fails on DagRun.run.verify_integrity. The fix is to add the start_date when deserializing the operator. ### Tests - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: * `test_deserialization_start_date` * `test_deserialization_end_date ` ### Commits - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 1. Subject is limited to 50 characters (not including Jira issue reference) 1. Subject does not end with a period 1. Subject uses the imperative mood ("add", not "adding") 1. Body wraps at 72 characters 1. Body explains "what" and "why", not "how" ### Documentation - [x] In case of new functionality, my PR adds documentation that describes how to use it. - All the public functions and the classes in the PR contain docstrings that explain what it does - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
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