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https://issues.apache.org/jira/browse/AIRFLOW-847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15856326#comment-15856326
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Daniel Huang commented on AIRFLOW-847:
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I ran into this last week. {{xcom_pull()}} by default pulls xcom values from
the current DAG
(https://github.com/apache/incubator-airflow/blob/master/airflow/models.py#L1668).
So if you're pulling from the SubDAG and want xcom values from the parent DAG,
you need to specify it in the {{dag_id}} param. For example, from a template:
{code}
{{ task_instance.xcom_pull(task_ids="do_thing", dag_id=dag.parent_dag.dag_id) }}
{code}
> Xcoms are not passed into SubDAG
> --------------------------------
>
> Key: AIRFLOW-847
> URL: https://issues.apache.org/jira/browse/AIRFLOW-847
> Project: Apache Airflow
> Issue Type: Bug
> Components: subdag, xcom
> Reporter: Robin B
> Priority: Blocker
>
> It's not possible to do a xcom_pull within a subdag
> None of the following seems to be working:
> * As templated var in SubDagoperator
> * As var in SubDagoperator
> * From within Subdag-factory
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