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"""
This is an example DAG which uses the LivyOperator.
The tasks below trigger the computation of pi on the Spark instance
using the Java and Python executables provided in the example library.
"""

from __future__ import annotations

import os
from datetime import datetime

from airflow import DAG
from airflow.providers.apache.livy.operators.livy import LivyOperator

ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
DAG_ID = "example_livy_operator"

with DAG(
    dag_id=DAG_ID,
    default_args={"args": [10]},
    schedule="@daily",
    start_date=datetime(2021, 1, 1),
    catchup=False,
) as dag:
    # [START create_livy]
    livy_java_task = LivyOperator(
        task_id="pi_java_task",
        file="/spark-examples.jar",
        num_executors=1,
        conf={
            "spark.shuffle.compress": "false",
        },
        class_name="org.apache.spark.examples.SparkPi",
    )

    livy_python_task = LivyOperator(task_id="pi_python_task", file="/pi.py", polling_interval=60)

    livy_java_task >> livy_python_task
    # [END create_livy]

    # [START create_livy_deferrable]
    livy_java_task_deferrable = LivyOperator(
        task_id="livy_java_task_deferrable",
        file="/spark-examples.jar",
        num_executors=1,
        conf={
            "spark.shuffle.compress": "false",
        },
        class_name="org.apache.spark.examples.SparkPi",
        deferrable=True,
    )

    livy_python_task_deferrable = LivyOperator(
        task_id="livy_python_task_deferrable", file="/pi.py", polling_interval=60, deferrable=True
    )

    livy_java_task_deferrable >> livy_python_task_deferrable
    # [END create_livy_deferrable]

    from tests_common.test_utils.watcher import watcher

    # This test needs watcher in order to properly mark success/failure
    # when "tearDown" task with trigger rule is part of the DAG
    list(dag.tasks) >> watcher()

from tests_common.test_utils.system_tests import get_test_run  # noqa: E402

# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
test_run = get_test_run(dag)
