jroachgolf84 commented on issue #62988:
URL: https://github.com/apache/airflow/issues/62988#issuecomment-4016738077
So, a couple of things here. XComs are tied to a TaskInstance, not a DagRun.
That is, having a snippet of code like the one below is ambiguous, as there are
multiple Tasks that an XCom could be written for.
```python
t_trigger = TriggerDagRunOperator(
task_id="trigger_child",
trigger_dag_id="child_dag",
wait_for_completion=True
)
postprocess(t_trigger)
```
Also, there is a `run_id` parameter that can be passed to `xcom_pull` (see
the code here:
https://github.com/apache/airflow/blob/main/airflow-core/src/airflow/models/taskinstance.py#L1671-L1699).
I think a docs improvement might be applicable here, but IMO, the
functionality is already in-place.
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