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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (AIRFLOW-3392) Add index on dag_id in sla_miss table
Date Tue, 27 Nov 2018 05:50:00 GMT


ASF GitHub Bot commented on AIRFLOW-3392:

feng-tao closed pull request #4235: [AIRFLOW-3392] Add index on dag_id in sla_miss table

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):

diff --git a/airflow/migrations/versions/ b/airflow/migrations/versions/
new file mode 100644
index 0000000000..fc8468155c
--- /dev/null
+++ b/airflow/migrations/versions/
@@ -0,0 +1,40 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+Revision ID: 03bc53e68815
+Revises: 0a2a5b66e19d, bf00311e1990
+Create Date: 2018-11-24 20:21:46.605414
+from alembic import op
+# revision identifiers, used by Alembic.
+revision = '03bc53e68815'
+down_revision = ('0a2a5b66e19d', 'bf00311e1990')
+branch_labels = None
+depends_on = None
+def upgrade():
+    op.create_index('sm_dag', 'sla_miss', ['dag_id'], unique=False)
+def downgrade():
+    op.drop_index('sm_dag', table_name='sla_miss')
diff --git a/airflow/ b/airflow/
index 9ab2348cc2..4b8b7dc5c9 100755
--- a/airflow/
+++ b/airflow/
@@ -5481,6 +5481,10 @@ class SlaMiss(Base):
     description = Column(Text)
     notification_sent = Column(Boolean, default=False)
+    __table_args__ = (
+        Index('sm_dag', dag_id, unique=False),
+    )
     def __repr__(self):
         return str((
             self.dag_id, self.task_id, self.execution_date.isoformat()))


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> Add index on dag_id in sla_miss table
> -------------------------------------
>                 Key: AIRFLOW-3392
>                 URL:
>             Project: Apache Airflow
>          Issue Type: Improvement
>            Reporter: Kevin Yang
>            Assignee: Kevin Yang
>            Priority: Major
> The select queries on sla_miss table produce a great % of DB traffic and thus made the
DB CPU usage unnecessarily high. It would be a low hanging fruit to add an index and reduce
the load.

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