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Fix DAG processor OOM || Avoid loading all TaskInstances when checking DagVersion in write_dag #60962

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Merged
dheerajturaga merged 1 commit into from
Jan 23, 2026
Merged

Fix DAG processor OOM || Avoid loading all TaskInstances when checking DagVersion in write_dag #60962

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11 changes: 9 additions & 2 deletions airflow-core/src/airflow/models/serialized_dag.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@

import sqlalchemy_jsonfield
import uuid6
from sqlalchemy import Column, ForeignKey, LargeBinary, String, exc, select, tuple_, update
from sqlalchemy import Column, ForeignKey, LargeBinary, String, exc, exists, select, tuple_, update
from sqlalchemy.orm import backref, foreign, relationship
from sqlalchemy.sql.expression import func, literal
from sqlalchemy_utils import UUIDType
Expand All @@ -43,6 +43,7 @@
from airflow.models.dag_version import DagVersion
from airflow.models.dagcode import DagCode
from airflow.models.dagrun import DagRun
from airflow.models.taskinstance import TaskInstance
from airflow.sdk.definitions.asset import AssetUniqueKey
from airflow.serialization.dag_dependency import DagDependency
from airflow.serialization.serialized_objects import LazyDeserializedDAG, SerializedDAG
Expand Down Expand Up @@ -423,7 +424,13 @@ def write_dag(
log.debug("Serialized DAG (%s) is unchanged. Skipping writing to DB", dag.dag_id)
return False

if dag_version and not dag_version.task_instances:
has_task_instances: bool = False
if dag_version:
has_task_instances = bool(
session.scalar(select(exists().where(TaskInstance.dag_version_id == dag_version.id)))
)

if dag_version and not has_task_instances:
# This is for dynamic DAGs that the hashes changes often. We should update
# the serialized dag, the dag_version and the dag_code instead of a new version
# if the dag_version is not associated with any task instances
Expand Down