airflow pool_slots_available_dep 源码
airflow pool_slots_available_dep 代码
文件路径：/airflow/ti_deps/deps/pool_slots_available_dep.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.
"""This module defines dep for pool slots availability"""
from __future__ import annotations
from airflow.ti_deps.dependencies_states import EXECUTION_STATES
from airflow.ti_deps.deps.base_ti_dep import BaseTIDep
from airflow.utils.session import provide_session
class PoolSlotsAvailableDep(BaseTIDep):
"""Dep for pool slots availability."""
NAME = "Pool Slots Available"
IGNORABLE = True
@provide_session
def _get_dep_statuses(self, ti, session, dep_context=None):
"""
Determines if the pool task instance is in has available slots
:param ti: the task instance to get the dependency status for
:param session: database session
:param dep_context: the context for which this dependency should be evaluated for
:return: True if there are available slots in the pool.
"""
from airflow.models.pool import Pool # To avoid a circular dependency
pool_name = ti.pool
pools = session.query(Pool).filter(Pool.pool == pool_name).all()
if not pools:
yield self._failing_status(
reason=f"Tasks using non-existent pool '{pool_name}' will not be scheduled"
)
return
else:
# Controlled by UNIQUE key in slot_pool table,
# only one result can be returned.
open_slots = pools[0].open_slots(session=session)
if ti.state in EXECUTION_STATES:
open_slots += ti.pool_slots
if open_slots <= (ti.pool_slots - 1):
yield self._failing_status(
reason=f"Not scheduling since there are {open_slots} open slots in pool {pool_name} "
f"and require {ti.pool_slots} pool slots"
)
else:
yield self._passing_status(
reason=f"There are enough open slots in {pool_name} to execute the task",
)
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