Fokko commented on a change in pull request #6461: [AIRFLOW-5804] Batch the
xcom pull operation
URL: https://github.com/apache/airflow/pull/6461#discussion_r340592142
##########
File path: airflow/models/taskinstance.py
##########
@@ -1376,17 +1375,20 @@ def xcom_pull(
if dag_id is None:
dag_id = self.dag_id
- pull_fn = functools.partial(
- XCom.get_one,
+ result = XCom.compose_query(
execution_date=self.execution_date,
key=key,
dag_id=dag_id,
- include_prior_dates=include_prior_dates)
+ task_id=task_ids,
+ include_prior_dates=include_prior_dates
+ )
if is_container(task_ids):
- return tuple(pull_fn(task_id=t) for t in task_ids)
+ return [XCom.deserialize_value(xcom) for xcom in result.all()]
Review comment:
Good point Ash, I've missed the `@reconstructor` and this caused tests to
fail. I've added the `.with_entities(XCom.value)` to the query, and therefore
we bypass the reconstructor. I must admit that I'm not a big fan of the
`@reconstructor` in general (Explicit is better than implicit). The
`.with_entities` will only fetch the `value` object, therefore we only select
this field from the database.
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