# -*- coding: utf-8 -*-
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from airflow.exceptions import AirflowException
from airflow.contrib.hooks.aws_hook import AwsHook
[docs]class EmrHook(AwsHook):
"""
Interact with AWS EMR. emr_conn_id is only necessary for using the
create_job_flow method.
"""
def __init__(self, emr_conn_id=None, region_name=None, *args, **kwargs):
self.emr_conn_id = emr_conn_id
self.region_name = region_name
super(EmrHook, self).__init__(*args, **kwargs)
[docs] def get_conn(self):
self.conn = self.get_client_type('emr', self.region_name)
return self.conn
[docs] def create_job_flow(self, job_flow_overrides):
"""
Creates a job flow using the config from the EMR connection.
Keys of the json extra hash may have the arguments of the boto3
run_job_flow method.
Overrides for this config may be passed as the job_flow_overrides.
"""
if not self.emr_conn_id:
raise AirflowException('emr_conn_id must be present to use create_job_flow')
emr_conn = self.get_connection(self.emr_conn_id)
config = emr_conn.extra_dejson.copy()
config.update(job_flow_overrides)
response = self.get_conn().run_job_flow(**config)
return response