问题描述
我有一个要求,我想每隔一个星期五安排一次气流作业.但是,问题是我不知道如何为此编写时间表.
I have a requirement that I want to schedule an airflow job every alternate Friday. However, the problem is I am not able to figure out how to write a schedule for this.
我不想为此有多个工作.
I don't want to have multiple jobs for this.
我试过了
'0 0 1-7,15-21 * 5
但是它不起作用,它每天从 1 点到 7 点和 15 点到 21 点运行.
However it's not working it's running from 1 to 7 and 15 to 21 everyday.
从 shubham 的回答中,我意识到我们可以拥有一个 PythonOperator,它可以为我们跳过任务.我试图实施解决方案.但是似乎不起作用.
from shubham's answer I realize that we can have a PythonOperator which can skip the task for us. An I tried to implement the solution. However doesn't seem to work.
因为在 2 周内进行测试太难了.这就是我所做的.
As testing this on 2 week period would be too difficult. This is what I did.
- 我安排 DAG 每 5 分钟运行一次
- 但是,我正在编写 python 操作符跳过替代任务(与我正在尝试做的事情非常相似,替代星期五).
DAG:
args = {
'owner': 'Gaurang Shah',
'retries': 0,
'start_date':airflow.utils.dates.days_ago(1),
}
dag = DAG(
dag_id='test_dag',
default_args=args,
catchup=False,
schedule_interval='*/5 * * * *',
max_active_runs=1
)
dummy_op = DummyOperator(task_id='dummy', dag=dag)
def _check_date(execution_date, **context):
min_date = datetime.now() - relativedelta(minutes=10)
print(context)
print(context.get("prev_execution_date"))
print(execution_date)
print(datetime.now())
print(min_date)
if execution_date > min_date:
raise AirflowSkipException(f"No data available on this execution_date ({execution_date}).")
check_date = PythonOperator(
task_id="check_if_min_date",
python_callable=_check_date,
provide_context=True,
dag=dag,
)
推荐答案
根据您的实现,您可以使用散列.使用 1.10 版在我的气流计划中工作:
Depending on your implementation you can use the hash. Worked in my airflow schedules using version 1.10:
哈希(#)'#' 允许用于星期字段,并且后面必须跟一个 1 到 5 之间的数字.它允许指定诸如第二个星期五"之类的结构.给定月份的.[19]例如,输入5#3"在星期几字段对应于每个月的第三个星期五.参考
Hash (#)'#' is allowed for the day-of-week field, and must be followed by a number between one and five. It allows specifying constructs such as "the second Friday" of a given month.[19] For example, entering "5#3" in the day-of-week field corresponds to the third Friday of every month. Reference
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