Submit a Spark job to an existing Amazon EMR cluster

README.md

Submit a Spark job to an existing Amazon EMR cluster

Creates a step in Amazon EMR for a given cluster_id and monitors it's progress using a sensor. A more complex example, that involves cluster creation/termination can be found here.

emr1.py

import airflow
from airflow import DAG
from airflow.contrib.operators.emr_add_steps_operator import EmrAddStepsOperator
from airflow.contrib.sensors.emr_step_sensor import EmrStepSensor
from datetime import timedelta

DEFAULT_ARGS = {
    'owner': 'airflow',
    'depends_on_past': False,
    'start_date': airflow.utils.dates.days_ago(2),
    'email': ['airflow@example.com'],
    'email_on_failure': False,
    'email_on_retry': False
}

SPARK_TEST_STEPS = [
    {
        'Name': 'TestSparkJob1',
        'ActionOnFailure': 'CONTINUE',
        'HadoopJarStep': {
            'Jar': 'command-runner.jar',
            'Args': [
                'spark-submit',
                '--deploy-mode', 'cluster',
                '--master', 'yarn',
                '--driver-memory', '1G',
                '--executor-memory','1G',
                '--num-executors', '1',
                '--class', 'Main',
                's3://dev-bucket/test-spark-job-spark-assembly-0.1.0-SNAPSHOT.jar'
            ]
        }
    }
]

cluster_id = "j-xxxxxxxxxxxxx"

dag = DAG(
    'emr1',
    default_args=DEFAULT_ARGS,
    dagrun_timeout=timedelta(hours=2),
    schedule_interval='0 3 * * *'
)

step_adder = EmrAddStepsOperator(
    task_id='add_steps',
    job_flow_id=cluster_id,
    aws_conn_id='aws_default',
    steps=SPARK_TEST_STEPS,
    dag=dag
)

step_checker = EmrStepSensor(
    task_id='watch_step',
    job_flow_id=cluster_id,
    step_id="{{ task_instance.xcom_pull('add_steps', key='return_value')[0] }}",
    aws_conn_id='aws_default',
    dag=dag
)

step_adder.set_downstream(step_checker)