test_on_kill.py

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from __future__ import annotations

import time
from typing import TYPE_CHECKING

from airflow.models.dag import DAG
from airflow.operators.empty import EmptyOperator
from airflow.utils.timezone import datetime

if TYPE_CHECKING:
    from airflow.utils.context import Context


class DummyWithOnKill(EmptyOperator):
    def execute(self, context: Context):
        import os

        self.log.info("Signalling that I am running")
        # signal to the test that we've started
        with open("/tmp/airflow_on_kill_running", "w") as f:
            f.write("ON_KILL_RUNNING")
        self.log.info("Signalled")

        # This runs extra processes, so that we can be sure that we correctly
        # tidy up all processes launched by a task when killing
        if not os.fork():
            os.system("sleep 10")
        time.sleep(10)

    def on_kill(self):
        self.log.info("Executing on_kill")
        with open("/tmp/airflow_on_kill_killed", "w") as f:
            f.write("ON_KILL_TEST")
        self.log.info("Executed on_kill")


# DAG tests backfill with pooled tasks
# Previously backfill would queue the task but never run it
dag1 = DAG(dag_id="test_on_kill", start_date=datetime(2015, 1, 1))

dag1_task1 = DummyWithOnKill(task_id="task1", dag=dag1, owner="airflow")