Navigating the Grid View

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Navigating the Grid View

• The Matrix: The Grid View shows a matrix where columns are DAG runs and rows are individual tasks.

• Status Colors: This is where you verify your trigger rules.

  • Dark Green: success (The parent task met the criteria).

  • Pink: skipped (The parent was skipped by a branch or a ShortCircuitOperator).

  • Red: failed (The parent crashed, which might block your downstream task depending on the rule).

  • Light Blue: scheduled or queued (The task is waiting for its trigger rule to be evaluated).

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Monitoring the "Join" Logic

When you use none_failed_min_one_success, you can watch the evaluation in real-time:

1. As soon as one branch turns Dark Green and the other turns Pink, the scheduler immediately evaluates the "Join" task.

2. If the rule is met, the "Join" task turns Tan (running) and then Dark Green.

3. If you had accidentally used the default all_success, you would see the "Join" task turn Pink the moment the first branch was skipped.

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The "Task Instance Details" Tab

If a task isn't running and you aren't sure why, click on the specific square in the grid and look at the Details tab:

• Dependency Resolution: Airflow will explicitly tell you: "Task is in the 'none_failed_min_one_success' state but the trigger rule has not been met" or "All dependencies met".

• Trigger Rule Info: It shows the count of parent states (e.g., successes: 1, skipped: 1, failed: 0).

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Summary Table for Debugging in the UI

If the Grid shows...	It usually means...
Pink "Join" Task	You likely used all_success (default) but one parent was skipped.
Orange/Upstream Failed	A parent failed and your rule (like none_failed) requires success/skip.
Green "Join" with Pink Parent	Your none_failed_min_one_success rule worked perfectly!

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