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Posted to commits@airflow.apache.org by "Adam Mustafa (JIRA)" <ji...@apache.org> on 2016/05/06 04:01:12 UTC
[jira] [Created] (AIRFLOW-54) Special tags when referring to other
tasks
Adam Mustafa created AIRFLOW-54:
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Summary: Special tags when referring to other tasks
Key: AIRFLOW-54
URL: https://issues.apache.org/jira/browse/AIRFLOW-54
Project: Apache Airflow
Issue Type: New Feature
Components: hooks, operators
Reporter: Adam Mustafa
Priority: Minor
At the moment when you need to refer to other tasks, you either have to refer to them by name or search though a list of upstream objects.
For example, in order to get the task_ids needed by xcom_pull for the upstream items, you need to do:
ti.xcom_pull(task_ids=[task.task_id for task in self.upstream_list])[0]
This issue suggests adding a keyword operator similar in form to those the schedule would use.
Possible items might include:
@upstream: Tasks directly upstream
@ancestor: Any task that is in the ancestor tree of this dag
@sibling: other tasks stemming from the same upstream tasks
@children: tasks from the children of this node
Aside from providing more simple arguments, this also improves the readability of the functions.
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