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()

        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']