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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 neccessary for using the
create_job_flow method.
"""
def __init__(self, emr_conn_id=None, *args, **kwargs):
self.emr_conn_id = emr_conn_id
super(EmrHook, self).__init__(*args, **kwargs)
def get_conn(self):
self.conn = self.get_client_type('emr')
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