Source code for airflow.contrib.operators.emr_add_steps_operator

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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 job_flow_name: name of the JobFlow to add steps to. Use as an alternative to passing job_flow_id. will search for id of JobFlow with matching name in one of the states in param cluster_states. Exactly one cluster like this should exist or will fail. (templated) :type job_flow_name: str :param cluster_states: Acceptable cluster states when searching for JobFlow id by job_flow_name. (templated) :type cluster_states: list :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 :param do_xcom_push: if True, job_flow_id is pushed to XCom with key job_flow_id. :type do_xcom_push: bool """
[docs] template_fields = ['job_flow_id', 'job_flow_name', 'cluster_states', 'steps']
[docs] template_ext = ()
[docs] ui_color = '#f9c915'
@apply_defaults def __init__( self, job_flow_id=None, job_flow_name=None, cluster_states=None, aws_conn_id='aws_default', steps=None, *args, **kwargs): if not ((job_flow_id is None) ^ (job_flow_name is None)): raise AirflowException('Exactly one of job_flow_id or job_flow_name must be specified.') super(EmrAddStepsOperator, self).__init__(*args, **kwargs) steps = steps or [] self.aws_conn_id = aws_conn_id self.job_flow_id = job_flow_id self.job_flow_name = job_flow_name self.cluster_states = cluster_states self.steps = steps
[docs] def execute(self, context): emr = EmrHook(aws_conn_id=self.aws_conn_id).get_conn() job_flow_id = self.job_flow_id if not job_flow_id: job_flow_id = emr.get_cluster_id_by_name(self.job_flow_name, self.cluster_states) if self.do_xcom_push: context['ti'].xcom_push(key='job_flow_id', value=job_flow_id) self.log.info('Adding steps to %s', job_flow_id) response = emr.add_job_flow_steps(JobFlowId=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']

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