airflow task_concurrency_dep 源码
airflow task_concurrency_dep 代码
文件路径：/airflow/ti_deps/deps/task_concurrency_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
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# 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.
from __future__ import annotations
from airflow.ti_deps.deps.base_ti_dep import BaseTIDep
from airflow.utils.session import provide_session
class TaskConcurrencyDep(BaseTIDep):
"""This restricts the number of running task instances for a particular task."""
NAME = "Task Concurrency"
IGNORABLE = True
IS_TASK_DEP = True
@provide_session
def _get_dep_statuses(self, ti, session, dep_context):
if ti.task.max_active_tis_per_dag is None:
yield self._passing_status(reason="Task concurrency is not set.")
return
if ti.get_num_running_task_instances(session) >= ti.task.max_active_tis_per_dag:
yield self._failing_status(reason="The max task concurrency has been reached.")
return
else:
yield self._passing_status(reason="The max task concurrency has not been reached.")
return
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