[英]Include time in airflow dag
我在气流新的,我想创建一个DAG,它运行每隔一小时,我们有一个过程importdata
其进口的文件,随后的过程sendReport
这给我们一份报告,每天两次在上午8点和下午6点。 我怎样才能包括时间?
编辑:我错过了你每天说两次的问题部分。 请注意,您不能要求某事恰好在上午 8 点或下午 6 点发生,因为执行取决于系统资源。 DAG 可能实际上在8:20
: 08:32
等运行......但是,由于我们正在安排每小时工作,我们知道应该在8AM
到9AM
之间运行一次,因此我们将验证是否满足时间范围以及是否满足所以我们将执行sendReport
。 更新代码:
import datetime
from airflow.models import DAG
from airflow.operators.dummy import DummyOperator
from airflow.operators.python import ShortCircuitOperator
from airflow.utils.edgemodifier import Label
def time_in_range(start, end, x):
"""Return true if x is in the range [start, end]"""
if start <= end:
return start <= x <= end
else:
return start <= x or x <= end
def shortcircuit_fn():
return time_in_range(
datetime.time(8, 0, 0),
datetime.time(9, 0, 0),
datetime.datetime.now().time(),
) or time_in_range(
datetime.time(18, 0, 0),
datetime.time(19, 0, 0),
datetime.datetime.now().time(),
)
with DAG(
dag_id="with_short_circuit_twice_a_day",
schedule_interval='@hourly',
start_date=datetime.datetime(2021, 7, 17),
catchup=False
) as dag:
first_op = DummyOperator(task_id='importdata') # Replace with your operator
short_op = ShortCircuitOperator(task_id='short_circuit',
python_callable=shortcircuit_fn
)
send_op = DummyOperator(task_id='sendReport') # Replace with your operator
first_op >> short_op >> Label("8<time<9 or 18<time<19") >> send_op
上一个答案:仅当您要发送所有在8AM
到6PM
8AM
之间运行的报告时,这才是相关的
有两种方法可以获得此功能。 您可以使用BranchDateTimeOperator
检查作业是否在所需的时间范围内运行,如下所示:
import datetime
from airflow.models import DAG
from airflow.operators.dummy import DummyOperator
from airflow.operators.datetime import BranchDateTimeOperator
from airflow.utils.edgemodifier import Label
with DAG(
dag_id="with_branching",
schedule_interval='@hourly',
start_date=datetime.datetime(2021, 7, 17),
catchup=False
) as dag:
first_op = DummyOperator(task_id='importdata') # Replace with your operator
branch_op = BranchDateTimeOperator(
task_id='branch',
follow_task_ids_if_true='sendReport',
follow_task_ids_if_false='do_nothing',
target_upper=datetime.time(18, 0, 0),
target_lower=datetime.time(8, 0, 0),
)
in_range_op = DummyOperator(task_id='sendReport') # Replace with your operator
out_of_range_op = DummyOperator(task_id='do_nothing')
first_op >> branch_op >> Label("8<time<18") >> in_range_op
branch_op >> Label("rest of day") >> out_of_range_op
在时间窗口外执行:
在时间窗口中执行:
如果您需要在工作流的每个分支中实际执行不同的任务,这是一个很好的解决方案。 如果不是这种情况,那么您可能应该在该解决方案中使用ShortCircuitOperator
的第二个选项,只有在满足时间标准的情况下,工作流才会继续发送sendReport
如果不满足标准,它将跳过:
import datetime
from airflow.models import DAG
from airflow.operators.dummy import DummyOperator
from airflow.operators.python import ShortCircuitOperator
from airflow.utils.edgemodifier import Label
def time_in_range(start, end, x):
"""Return true if x is in the range [start, end]"""
if start <= end:
return start <= x <= end
else:
return start <= x or x <= end
def shortcircuit_fn():
return time_in_range(datetime.time(8, 0, 0),
datetime.time(18, 0, 0),
datetime.datetime.now().time(),
)
with DAG(
dag_id="with_short_circuit",
schedule_interval='@hourly',
start_date=datetime.datetime(2021, 7, 17),
catchup=False
) as dag:
first_op = DummyOperator(task_id='importdata') # Replace with your operator
short_op = ShortCircuitOperator(task_id='short_circuit',
python_callable=shortcircuit_fn
)
send_op = DummyOperator(task_id='sendReport') # Replace with your operator
first_op >> short_op >> Label("8<time<18") >> send_op
在时间窗口外执行:
在时间窗口中执行:
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