Source code for airflow.contrib.sensors.emr_step_sensor

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from airflow.contrib.hooks.emr_hook import EmrHook
from airflow.contrib.sensors.emr_base_sensor import EmrBaseSensor
from airflow.utils import apply_defaults


[docs]class EmrStepSensor(EmrBaseSensor): """ Asks for the state of the step until it reaches a terminal state. If it fails the sensor errors, failing the task. :param job_flow_id: job_flow_id which contains the step check the state of :type job_flow_id: string :param step_id: step to check the state of :type step_id: string """ NON_TERMINAL_STATES = ['PENDING', 'RUNNING', 'CONTINUE'] FAILED_STATE = ['CANCELLED', 'FAILED'] template_fields = ['job_flow_id', 'step_id'] template_ext = () @apply_defaults def __init__(self, job_flow_id, step_id, *args, **kwargs): super(EmrStepSensor, self).__init__(*args, **kwargs) self.job_flow_id = job_flow_id self.step_id = step_id def get_emr_response(self): emr = EmrHook(aws_conn_id=self.aws_conn_id).get_conn() self.log.info('Poking step %s on cluster %s', self.step_id, self.job_flow_id) return emr.describe_step(ClusterId=self.job_flow_id, StepId=self.step_id) def state_from_response(self, response): return response['Step']['Status']['State']