airflow 0043_1_10_4_make_taskinstance_pool_not_nullable 源码
airflow 0043_1_10_4_make_taskinstance_pool_not_nullable 代码
文件路径:/airflow/migrations/versions/0043_1_10_4_make_taskinstance_pool_not_nullable.py
#
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# 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
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# 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.
"""Make ``TaskInstance.pool`` not nullable
Revision ID: 6e96a59344a4
Revises: 939bb1e647c8
Create Date: 2019-06-13 21:51:32.878437
"""
from __future__ import annotations
import sqlalchemy as sa
from alembic import op
from sqlalchemy import Column, String
from sqlalchemy.ext.declarative import declarative_base
from airflow.utils.session import create_session
from airflow.utils.sqlalchemy import UtcDateTime
# revision identifiers, used by Alembic.
revision = '6e96a59344a4'
down_revision = '939bb1e647c8'
branch_labels = None
depends_on = None
airflow_version = '1.10.4'
Base = declarative_base()
ID_LEN = 250
class TaskInstance(Base): # type: ignore
"""Minimal model definition for migrations"""
__tablename__ = "task_instance"
task_id = Column(String(), primary_key=True)
dag_id = Column(String(), primary_key=True)
execution_date = Column(UtcDateTime, primary_key=True)
pool = Column(String(50), nullable=False)
def upgrade():
"""Make TaskInstance.pool field not nullable."""
with create_session() as session:
session.query(TaskInstance).filter(TaskInstance.pool.is_(None)).update(
{TaskInstance.pool: 'default_pool'}, synchronize_session=False
) # Avoid select updated rows
session.commit()
conn = op.get_bind()
if conn.dialect.name == "mssql":
op.drop_index('ti_pool', table_name='task_instance')
# use batch_alter_table to support SQLite workaround
with op.batch_alter_table('task_instance') as batch_op:
batch_op.alter_column(
column_name='pool',
type_=sa.String(50),
nullable=False,
)
if conn.dialect.name == "mssql":
op.create_index('ti_pool', 'task_instance', ['pool', 'state', 'priority_weight'])
def downgrade():
"""Make TaskInstance.pool field nullable."""
conn = op.get_bind()
if conn.dialect.name == "mssql":
op.drop_index('ti_pool', table_name='task_instance')
# use batch_alter_table to support SQLite workaround
with op.batch_alter_table('task_instance') as batch_op:
batch_op.alter_column(
column_name='pool',
type_=sa.String(50),
nullable=True,
)
if conn.dialect.name == "mssql":
op.create_index('ti_pool', 'task_instance', ['pool', 'state', 'priority_weight'])
with create_session() as session:
session.query(TaskInstance).filter(TaskInstance.pool == 'default_pool').update(
{TaskInstance.pool: None}, synchronize_session=False
) # Avoid select updated rows
session.commit()
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