Source code for airflow.models.taskreschedule

#
# 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.
"""TaskReschedule tracks rescheduled task instances."""
from sqlalchemy import Column, ForeignKeyConstraint, Index, Integer, String, asc, desc
from sqlalchemy.ext.associationproxy import association_proxy
from sqlalchemy.orm import relationship

from airflow.models.base import COLLATION_ARGS, ID_LEN, Base
from airflow.utils.session import provide_session
from airflow.utils.sqlalchemy import UtcDateTime


[docs]class TaskReschedule(Base): """TaskReschedule tracks rescheduled task instances."""
[docs] __tablename__ = "task_reschedule"
[docs] id = Column(Integer, primary_key=True)
[docs] task_id = Column(String(ID_LEN, **COLLATION_ARGS), nullable=False)
[docs] dag_id = Column(String(ID_LEN, **COLLATION_ARGS), nullable=False)
[docs] run_id = Column(String(ID_LEN, **COLLATION_ARGS), nullable=False)
[docs] try_number = Column(Integer, nullable=False)
[docs] start_date = Column(UtcDateTime, nullable=False)
[docs] end_date = Column(UtcDateTime, nullable=False)
[docs] duration = Column(Integer, nullable=False)
[docs] reschedule_date = Column(UtcDateTime, nullable=False)
[docs] __table_args__ = ( Index('idx_task_reschedule_dag_task_run', dag_id, task_id, run_id, unique=False), ForeignKeyConstraint( [dag_id, task_id, run_id], ['task_instance.dag_id', 'task_instance.task_id', 'task_instance.run_id'], name='task_reschedule_ti_fkey', ondelete='CASCADE', ), ForeignKeyConstraint( [dag_id, run_id], ['dag_run.dag_id', 'dag_run.run_id'], name='task_reschedule_dr_fkey', ondelete='CASCADE',
), )
[docs] dag_run = relationship("DagRun")
[docs] execution_date = association_proxy("dag_run", "execution_date")
def __init__(self, task, run_id, try_number, start_date, end_date, reschedule_date): self.dag_id = task.dag_id self.task_id = task.task_id self.run_id = run_id self.try_number = try_number self.start_date = start_date self.end_date = end_date self.reschedule_date = reschedule_date self.duration = (self.end_date - self.start_date).total_seconds() @staticmethod @provide_session
[docs] def query_for_task_instance(task_instance, descending=False, session=None, try_number=None): """ Returns query for task reschedules for a given the task instance. :param session: the database session object :type session: sqlalchemy.orm.session.Session :param task_instance: the task instance to find task reschedules for :type task_instance: airflow.models.TaskInstance :param descending: If True then records are returned in descending order :type descending: bool :param try_number: Look for TaskReschedule of the given try_number. Default is None which looks for the same try_number of the given task_instance. :type try_number: int """ if try_number is None: try_number = task_instance.try_number TR = TaskReschedule qry = session.query(TR).filter( TR.dag_id == task_instance.dag_id, TR.task_id == task_instance.task_id, TR.run_id == task_instance.run_id, TR.try_number == try_number, ) if descending: return qry.order_by(desc(TR.id)) else: return qry.order_by(asc(TR.id))
@staticmethod @provide_session
[docs] def find_for_task_instance(task_instance, session=None, try_number=None): """ Returns all task reschedules for the task instance and try number, in ascending order. :param session: the database session object :type session: sqlalchemy.orm.session.Session :param task_instance: the task instance to find task reschedules for :type task_instance: airflow.models.TaskInstance :param try_number: Look for TaskReschedule of the given try_number. Default is None which looks for the same try_number of the given task_instance. :type try_number: int """ return TaskReschedule.query_for_task_instance( task_instance, session=session, try_number=try_number
).all()

Was this entry helpful?