airflow.sensors.date_time_sensor

Module Contents

class airflow.sensors.date_time_sensor.DateTimeSensor(target_time, *args, **kwargs)[source]

Bases: airflow.sensors.base_sensor_operator.BaseSensorOperator

Waits until the specified datetime.

A major advantage of this sensor is idempotence for the target_time. It handles some cases for which TimeSensor and TimeDeltaSensor are not suited.

Example 1 :

If a task needs to wait for 11am on each execution_date. Using TimeSensor or TimeDeltaSensor, all backfill tasks started at 1am have to wait for 10 hours. This is unnecessary, e.g. a backfill task with {{ ds }} = '1970-01-01' does not need to wait because 1970-01-01T11:00:00 has already passed.

Example 2 :

If a DAG is scheduled to run at 23:00 daily, but one of the tasks is required to run at 01:00 next day, using TimeSensor will return True immediately because 23:00 > 01:00. Instead, we can do this:

DateTimeSensor(
    task_id='wait_for_0100',
    target_time='{{ next_execution_date.tomorrow().replace(hour=1) }}',
)
Parameters

target_time (str or datetime.datetime) – datetime after which the job succeeds. (templated)

template_fields = ['target_time'][source]
poke(self, context)[source]