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Posted to commits@airflow.apache.org by "pierrejeambrun (via GitHub)" <gi...@apache.org> on 2026/03/11 16:55:04 UTC
[PR] Fix task group lookup using wrong DAG version for historical runs [airflow]
pierrejeambrun opened a new pull request, #63360:
URL: https://github.com/apache/airflow/pull/63360
When a task group is renamed between DAG versions, the API's get_task_instances endpoint was resolving task groups against the latest DAG version instead of the version the run was created with. This caused 404 errors when clicking on task groups in the grid view for historical runs.
The fix changes get_dag_for_run_or_latest_version to prefer the run's created_dag_version_id, falling back to the existing behavior only when unavailable.
To reproduce use this Dag:
- Start a run and wait for it to finish
- Flip the rename flag to true and reparse the Dag or wait a little bit for v2 to come up
- Start a 2nd run
Then clicking on first run "process_data" task group will fail like the screenshot below
```
from __future__ import annotations
from datetime import datetime
from airflow.providers.standard.operators.empty import EmptyOperator
from airflow.sdk import DAG, TaskGroup
RENAME = False # flip to True after step 2
group_id = "process_data_v2" if RENAME else "process_data"
with DAG(
dag_id="repro_task_group_not_found",
start_date=datetime(2024, 1, 1),
schedule=None,
):
with TaskGroup(group_id=group_id) as tg:
EmptyOperator(task_id="step_1")
EmptyOperator(task_id="step_2")
EmptyOperator(task_id="done") << tg
```
### Before
<img width="1920" height="806" alt="Screenshot 2026-03-11 at 17 54 49" src="https://github.com/user-attachments/assets/569cad5c-ca75-4e2f-b537-46c09678a4b9" />
### After
<img width="1917" height="943" alt="Screenshot 2026-03-11 at 17 53 27" src="https://github.com/user-attachments/assets/789f814f-172a-424e-b485-2011b928be76" />
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Re: [PR] Fix task group lookup using wrong DAG version for historical runs [airflow]
Posted by "pierrejeambrun (via GitHub)" <gi...@apache.org>.
pierrejeambrun merged PR #63360:
URL: https://github.com/apache/airflow/pull/63360
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Re: [PR] Fix task group lookup using wrong DAG version for historical runs [airflow]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #63360:
URL: https://github.com/apache/airflow/pull/63360#issuecomment-4045938706
### Backport successfully created: v3-1-test
Note: As of [Merging PRs targeted for Airflow 3.X](https://github.com/apache/airflow/blob/main/dev/README_AIRFLOW3_DEV.md#merging-prs-targeted-for-airflow-3x)
the committer who merges the PR is responsible for backporting the PRs that are bug fixes (generally speaking) to the maintenance branches.
In matter of doubt please ask in [#release-management](https://apache-airflow.slack.com/archives/C03G9H97MM2) Slack channel.
<table>
<tr>
<th>Status</th>
<th>Branch</th>
<th>Result</th>
</tr>
<tr>
<td>✅</td>
<td>v3-1-test</td>
<td><a href="https://github.com/apache/airflow/pull/63433"><img src="https://img.shields.io/badge/PR-63433-blue" alt="PR Link"></a></td>
</tr>
</table>
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Re: [PR] Fix task group lookup using wrong DAG version for historical runs [airflow]
Posted by "pierrejeambrun (via GitHub)" <gi...@apache.org>.
pierrejeambrun commented on PR #63360:
URL: https://github.com/apache/airflow/pull/63360#issuecomment-4040797647
We can't directly modify `_version_from_dag_run` because that's the expected behavior for the scheduler at the moment. (most of the time just taking the latest version)
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