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from airflow.contrib.hooks.emr_hook import EmrHook
from airflow.models import BaseOperator
from airflow.utils import apply_defaults
from airflow.exceptions import AirflowException
[docs]class EmrCreateJobFlowOperator(BaseOperator):
"""
Creates an EMR JobFlow, reading the config from the EMR connection.
A dictionary of JobFlow overrides can be passed that override
the config from the connection.
:param aws_conn_id: aws connection to uses
:type aws_conn_id: str
:param emr_conn_id: emr connection to use
:type emr_conn_id: str
:param job_flow_overrides: boto3 style arguments to override
emr_connection extra. (templated)
:type job_flow_overrides: dict
"""
[docs] template_fields = ['job_flow_overrides']
@apply_defaults
def __init__(
self,
aws_conn_id='s3_default',
emr_conn_id='emr_default',
job_flow_overrides=None,
region_name=None,
*args, **kwargs):
super(EmrCreateJobFlowOperator, self).__init__(*args, **kwargs)
self.aws_conn_id = aws_conn_id
self.emr_conn_id = emr_conn_id
if job_flow_overrides is None:
job_flow_overrides = {}
self.job_flow_overrides = job_flow_overrides
self.region_name = region_name
[docs] def execute(self, context):
emr = EmrHook(aws_conn_id=self.aws_conn_id,
emr_conn_id=self.emr_conn_id,
region_name=self.region_name)
self.log.info(
'Creating JobFlow using aws-conn-id: %s, emr-conn-id: %s',
self.aws_conn_id, self.emr_conn_id
)
response = emr.create_job_flow(self.job_flow_overrides)
if not response['ResponseMetadata']['HTTPStatusCode'] == 200:
raise AirflowException('JobFlow creation failed: %s' % response)
else:
self.log.info('JobFlow with id %s created', response['JobFlowId'])
return response['JobFlowId']