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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: str
"""
[docs] NON_TERMINAL_STATES = ['STARTING', 'BOOTSTRAPPING', 'RUNNING',
'WAITING', 'TERMINATING']
[docs] FAILED_STATE = ['TERMINATED_WITH_ERRORS']
[docs] template_fields = ['job_flow_id']
@apply_defaults
def __init__(self,
job_flow_id,
*args,
**kwargs):
super(EmrJobFlowSensor, self).__init__(*args, **kwargs)
self.job_flow_id = job_flow_id
[docs] 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
[docs] def state_from_response(response):
return response['Cluster']['Status']['State']
@staticmethod
[docs] def failure_message_from_response(response):
state_change_reason = response['Cluster']['Status'].get('StateChangeReason')
if state_change_reason:
return 'for code: {} with message {}'.format(state_change_reason.get('Code', 'No code'),
state_change_reason.get('Message', 'Unknown'))
return None