Hello Khasim, Thanks for your report and helping to improve Airflow.
But the devlist is more for deeper discussions, announcements and collaboration of airflow. If you want to report an issue with airflow - follow the https://airflow.apache.org/community/ and "Report a bug" path to report it in GitHub Issue. Note however, that 2.7 is quite an old version and particularly 2.7.2 already has a number of patchlevel and fixes released years ago that are likely to fix 100s of issues and it's very likely that the problems you are reporting are already fixed. We are at airflow 3.1.0 so 3.1.1 is coming, and the only fixes we maybe are going to apply to 2. line is 2.11 - so my advice before you report the issue is to upgrade Airflow (to 2.11 or even better to 3.1) and verify if the issue is still there. J. On Tue, Oct 21, 2025 at 5:43 AM Khasim Shaik <[email protected]> wrote: > Subject: [Bug Report] Graph View missing tasks for large nested TaskGroups > Body: > > Hello Airflow Core Team, > > I hope you are doing well. > > I observed a potential bug in Apache Airflow v2.7.x where the Graph View UI > sometimes fails to render all tasks in DAGs with more than 20 nested > TaskGroups. I drafted this bug report with guidance and have verified the > issue in my environment. > > Steps to reproduce: > 1. Create a DAG with 25+ tasks. > 2. Nest some tasks using TaskGroup. > 3. Open Graph View in Airflow Web UI. > > Expected behavior: > - All tasks and dependencies should render correctly, regardless of the > number of nested TaskGroups. > > Actual behavior: > - Some tasks disappear, and edges fail to connect, making DAG visualization > incomplete. > > Environment: > - Apache Airflow v2.7.2 > - Python 3.11 > - Chrome v120 > - OS: Ubuntu 22.04 > > Proposed solution: > - Update `dagGraph.render()` in `airflow/www/static/js/daggraph.js` to > dynamically calculate node offsets. > - Ensure the SVG container resizes dynamically to fit all tasks. > - Optional: add a scrollable container for DAGs with hundreds of tasks. > - I can provide a Pull Request with the fix if desired. > > Thank you for your time and for maintaining this incredible project. > > Best regards, > Khasim Shaik > > > Script > > from airflow import DAG > from airflow.operators.dummy import DummyOperator > from airflow.utils.task_group import TaskGroup > from datetime import datetime > > # Define DAG > with DAG( > dag_id='nested_taskgroup_bug_demo', > start_date=datetime(2025, 10, 21), > schedule_interval=None, > catchup=False, > ) as dag: > > start = DummyOperator(task_id='start') > end = DummyOperator(task_id='end') > > # Outer TaskGroup > with TaskGroup("outer_group") as outer_group: > # Nested TaskGroups > for i in range(1, 4): # 3 nested groups > with TaskGroup(f"nested_group_{i}") as nested_group: > for j in range(1, 10): # 9 tasks per nested group > task = DummyOperator(task_id=f"task_{i}_{j}") > > # DAG structure > start >> outer_group >> end >
