airflow 0080_2_0_2_change_default_pool_slots_to_1 源码
airflow 0080_2_0_2_change_default_pool_slots_to_1 代码
文件路径：/airflow/migrations/versions/0080_2_0_2_change_default_pool_slots_to_1.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
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# under the License.
"""Change default ``pool_slots`` to ``1``
Revision ID: 8646922c8a04
Revises: 449b4072c2da
Create Date: 2021-02-23 23:19:22.409973
"""
from __future__ import annotations
import sqlalchemy as sa
from alembic import op
# revision identifiers, used by Alembic.
revision = '8646922c8a04'
down_revision = '449b4072c2da'
branch_labels = None
depends_on = None
airflow_version = '2.0.2'
def upgrade():
"""Change default ``pool_slots`` to ``1`` and make pool_slots not nullable"""
op.execute("UPDATE task_instance SET pool_slots = 1 WHERE pool_slots IS NULL")
with op.batch_alter_table("task_instance", schema=None) as batch_op:
batch_op.alter_column("pool_slots", existing_type=sa.Integer, nullable=False, server_default='1')
def downgrade():
"""Unapply Change default ``pool_slots`` to ``1``"""
conn = op.get_bind()
if conn.dialect.name == 'mssql':
inspector = sa.inspect(conn.engine)
columns = inspector.get_columns('task_instance')
for col in columns:
if col['name'] == 'pool_slots' and col['default'] == "('1')":
with op.batch_alter_table("task_instance", schema=None) as batch_op:
batch_op.alter_column(
"pool_slots", existing_type=sa.Integer, nullable=True, server_default=None
)
else:
with op.batch_alter_table("task_instance", schema=None) as batch_op:
batch_op.alter_column("pool_slots", existing_type=sa.Integer, nullable=True, server_default=None)
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