airflow 0086_2_1_4_add_max_active_runs_column_to_dagmodel_ 源码
airflow 0086_2_1_4_add_max_active_runs_column_todagmodel 代码
文件路径：/airflow/migrations/versions/0086_2_1_4_add_max_active_runs_column_todagmodel.py
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# to you under the Apache License, Version 2.0 (the
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"""Add ``max_active_runs`` column to ``dag_model`` table
Revision ID: 092435bf5d12
Revises: 97cdd93827b8
Create Date: 2021-09-06 21:29:24.728923
"""
from __future__ import annotations
import sqlalchemy as sa
from alembic import op
from sqlalchemy import text
# revision identifiers, used by Alembic.
revision = '092435bf5d12'
down_revision = '97cdd93827b8'
branch_labels = None
depends_on = None
airflow_version = '2.1.4'
def upgrade():
"""Apply Add ``max_active_runs`` column to ``dag_model`` table"""
op.add_column('dag', sa.Column('max_active_runs', sa.Integer(), nullable=True))
with op.batch_alter_table('dag_run', schema=None) as batch_op:
# Add index to dag_run.dag_id and also add index to dag_run.state where state==running
batch_op.create_index('idx_dag_run_dag_id', ['dag_id'])
batch_op.create_index(
'idx_dag_run_running_dags',
["state", "dag_id"],
postgresql_where=text("state='running'"),
mssql_where=text("state='running'"),
sqlite_where=text("state='running'"),
)
def downgrade():
"""Unapply Add ``max_active_runs`` column to ``dag_model`` table"""
with op.batch_alter_table('dag') as batch_op:
batch_op.drop_column('max_active_runs')
with op.batch_alter_table('dag_run', schema=None) as batch_op:
# Drop index to dag_run.dag_id and also drop index to dag_run.state where state==running
batch_op.drop_index('idx_dag_run_dag_id')
batch_op.drop_index('idx_dag_run_running_dags')
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