Source code for airflow.providers.databricks.example_dags.example_databricks
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"""
This is an example DAG which uses the DatabricksSubmitRunOperator.
In this example, we create two tasks which execute sequentially.
The first task is to run a notebook at the workspace path "/test"
and the second task is to run a JAR uploaded to DBFS. Both,
tasks use new clusters.
Because we have set a downstream dependency on the notebook task,
the spark jar task will NOT run until the notebook task completes
successfully.
The definition of a successful run is if the run has a result_state of "SUCCESS".
For more information about the state of a run refer to
https://docs.databricks.com/api/latest/jobs.html#runstate
"""
from airflow import DAG
from airflow.providers.databricks.operators.databricks import DatabricksSubmitRunOperator
from airflow.utils.dates import days_ago
default_args = {
'owner': 'airflow',
'email': ['airflow@example.com'],
'depends_on_past': False,
}
with DAG(
dag_id='example_databricks_operator',
default_args=default_args,
schedule_interval='@daily',
start_date=days_ago(2),
tags=['example'],
) as dag:
new_cluster = {
'spark_version': '2.1.0-db3-scala2.11',
'node_type_id': 'r3.xlarge',
'aws_attributes': {'availability': 'ON_DEMAND'},
'num_workers': 8,
}
notebook_task_params = {
'new_cluster': new_cluster,
'notebook_task': {
'notebook_path': '/Users/airflow@example.com/PrepareData',
},
}
# [START howto_operator_databricks_json]
# Example of using the JSON parameter to initialize the operator.
notebook_task = DatabricksSubmitRunOperator(task_id='notebook_task', json=notebook_task_params)
# [END howto_operator_databricks_json]
# [START howto_operator_databricks_named]
# Example of using the named parameters of DatabricksSubmitRunOperator
# to initialize the operator.
spark_jar_task = DatabricksSubmitRunOperator(
task_id='spark_jar_task',
new_cluster=new_cluster,
spark_jar_task={'main_class_name': 'com.example.ProcessData'},
libraries=[{'jar': 'dbfs:/lib/etl-0.1.jar'}],
)
# [END howto_operator_databricks_named]
notebook_task >> spark_jar_task