# -*- coding: utf-8 -*-
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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 EmrJobFlowSensor(EmrBaseSensor):
"""
Asks for the state of the JobFlow until it reaches a terminal state.
If it fails the sensor errors, failing the task.
:param job_flow_id: job_flow_id to check the state of
:type job_flow_id: string
"""
NON_TERMINAL_STATES = ['STARTING', 'BOOTSTRAPPING', 'RUNNING',
'WAITING', 'TERMINATING']
FAILED_STATE = ['TERMINATED_WITH_ERRORS']
template_fields = ['job_flow_id']
template_ext = ()
@apply_defaults
def __init__(self,
job_flow_id,
*args,
**kwargs):
super(EmrJobFlowSensor, self).__init__(*args, **kwargs)
self.job_flow_id = job_flow_id
def get_emr_response(self):
emr = EmrHook(aws_conn_id=self.aws_conn_id).get_conn()
self.log.info('Poking cluster %s', self.job_flow_id)
return emr.describe_cluster(ClusterId=self.job_flow_id)
@staticmethod
def state_from_response(response):
return response['Cluster']['Status']['State']