Source code for airflow.contrib.operators.emr_add_steps_operator

# -*- 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_id: 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 """
[docs] template_fields = ['job_flow_id', 'steps']
[docs] template_ext = ()
[docs] 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()'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:'Steps %s added to JobFlow', response['StepIds']) return response['StepIds']