airflow 0069_2_0_0_add_scheduling_decision_to_dagrun_and_ 源码
airflow 0069_2_0_0_add_scheduling_decision_to_dagrunand 代码
文件路径:/airflow/migrations/versions/0069_2_0_0_add_scheduling_decision_to_dagrunand.py
#
# 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
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
"""Add ``scheduling_decision`` to ``DagRun`` and ``DAG``
Revision ID: 98271e7606e2
Revises: bef4f3d11e8b
Create Date: 2020-10-01 12:13:32.968148
"""
from __future__ import annotations
import sqlalchemy as sa
from alembic import op
from airflow.migrations.db_types import TIMESTAMP
# revision identifiers, used by Alembic.
revision = '98271e7606e2'
down_revision = 'bef4f3d11e8b'
branch_labels = None
depends_on = None
airflow_version = '2.0.0'
def upgrade():
"""Apply Add ``scheduling_decision`` to ``DagRun`` and ``DAG``"""
conn = op.get_bind()
is_sqlite = bool(conn.dialect.name == "sqlite")
is_mssql = bool(conn.dialect.name == "mssql")
if is_sqlite:
op.execute("PRAGMA foreign_keys=off")
with op.batch_alter_table('dag_run', schema=None) as batch_op:
batch_op.add_column(sa.Column('last_scheduling_decision', TIMESTAMP, nullable=True))
batch_op.create_index('idx_last_scheduling_decision', ['last_scheduling_decision'], unique=False)
batch_op.add_column(sa.Column('dag_hash', sa.String(32), nullable=True))
with op.batch_alter_table('dag', schema=None) as batch_op:
batch_op.add_column(sa.Column('next_dagrun', TIMESTAMP, nullable=True))
batch_op.add_column(sa.Column('next_dagrun_create_after', TIMESTAMP, nullable=True))
# Create with nullable and no default, then ALTER to set values, to avoid table level lock
batch_op.add_column(sa.Column('concurrency', sa.Integer(), nullable=True))
batch_op.add_column(sa.Column('has_task_concurrency_limits', sa.Boolean(), nullable=True))
batch_op.create_index('idx_next_dagrun_create_after', ['next_dagrun_create_after'], unique=False)
try:
from airflow.configuration import conf
concurrency = conf.getint('core', 'dag_concurrency', fallback=16)
except: # noqa
concurrency = 16
# Set it to true here as it makes us take the slow/more complete path, and when it's next parsed by the
# DagParser it will get set to correct value.
op.execute(
f"""
UPDATE dag SET
concurrency={concurrency},
has_task_concurrency_limits={1 if is_sqlite or is_mssql else sa.true()}
where concurrency IS NULL
"""
)
with op.batch_alter_table('dag', schema=None) as batch_op:
batch_op.alter_column('concurrency', type_=sa.Integer(), nullable=False)
batch_op.alter_column('has_task_concurrency_limits', type_=sa.Boolean(), nullable=False)
if is_sqlite:
op.execute("PRAGMA foreign_keys=on")
def downgrade():
"""Unapply Add ``scheduling_decision`` to ``DagRun`` and ``DAG``"""
conn = op.get_bind()
is_sqlite = bool(conn.dialect.name == "sqlite")
if is_sqlite:
op.execute("PRAGMA foreign_keys=off")
with op.batch_alter_table('dag_run', schema=None) as batch_op:
batch_op.drop_index('idx_last_scheduling_decision')
batch_op.drop_column('last_scheduling_decision')
batch_op.drop_column('dag_hash')
with op.batch_alter_table('dag', schema=None) as batch_op:
batch_op.drop_index('idx_next_dagrun_create_after')
batch_op.drop_column('next_dagrun_create_after')
batch_op.drop_column('next_dagrun')
batch_op.drop_column('concurrency')
batch_op.drop_column('has_task_concurrency_limits')
if is_sqlite:
op.execute("PRAGMA foreign_keys=on")
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