# -*- coding: utf-8 -*-
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from airflow.models import BaseOperator
from airflow.utils import apply_defaults
from airflow.exceptions import AirflowException
from airflow.contrib.hooks.emr_hook import EmrHook
[docs]class EmrAddStepsOperator(BaseOperator):
"""
An operator that adds steps to an existing EMR job_flow.
:param job_flow_id: id of the JobFlow to add steps to. (templated)
:type job_flow_name: str
:param aws_conn_id: aws connection to uses
:type aws_conn_id: str
:param steps: boto3 style steps to be added to the jobflow. (templated)
:type steps: list
"""
template_fields = ['job_flow_id', 'steps']
template_ext = ()
ui_color = '#f9c915'
@apply_defaults
def __init__(
self,
job_flow_id,
aws_conn_id='s3_default',
steps=None,
*args, **kwargs):
super(EmrAddStepsOperator, self).__init__(*args, **kwargs)
steps = steps or []
self.job_flow_id = job_flow_id
self.aws_conn_id = aws_conn_id
self.steps = steps
[docs] def execute(self, context):
emr = EmrHook(aws_conn_id=self.aws_conn_id).get_conn()
self.log.info('Adding steps to %s', self.job_flow_id)
response = emr.add_job_flow_steps(JobFlowId=self.job_flow_id, Steps=self.steps)
if not response['ResponseMetadata']['HTTPStatusCode'] == 200:
raise AirflowException('Adding steps failed: %s' % response)
else:
self.log.info('Steps %s added to JobFlow', response['StepIds'])
return response['StepIds']