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import sys
from typing import TYPE_CHECKING, Any, Dict, Iterable, Optional, Sequence
if TYPE_CHECKING:
from airflow.utils.context import Context
if sys.version_info >= (3, 8):
from functools import cached_property
else:
from cached_property import cached_property
from airflow.exceptions import AirflowException
from airflow.providers.amazon.aws.hooks.emr import EmrContainerHook, EmrHook
from airflow.sensors.base import BaseSensorOperator
[docs]class EmrBaseSensor(BaseSensorOperator):
"""
Contains general sensor behavior for EMR.
Subclasses should implement following methods:
- ``get_emr_response()``
- ``state_from_response()``
- ``failure_message_from_response()``
Subclasses should set ``target_states`` and ``failed_states`` fields.
:param aws_conn_id: aws connection to uses
"""
def __init__(self, *, aws_conn_id: str = 'aws_default', **kwargs):
super().__init__(**kwargs)
self.aws_conn_id = aws_conn_id
self.target_states: Iterable[str] = [] # will be set in subclasses
self.failed_states: Iterable[str] = [] # will be set in subclasses
self.hook: Optional[EmrHook] = None
[docs] def get_hook(self) -> EmrHook:
"""Get EmrHook"""
if self.hook:
return self.hook
self.hook = EmrHook(aws_conn_id=self.aws_conn_id)
return self.hook
[docs] def poke(self, context: 'Context'):
response = self.get_emr_response()
if not response['ResponseMetadata']['HTTPStatusCode'] == 200:
self.log.info('Bad HTTP response: %s', response)
return False
state = self.state_from_response(response)
self.log.info('Job flow currently %s', state)
if state in self.target_states:
return True
if state in self.failed_states:
final_message = 'EMR job failed'
failure_message = self.failure_message_from_response(response)
if failure_message:
final_message += ' ' + failure_message
raise AirflowException(final_message)
return False
[docs] def get_emr_response(self) -> Dict[str, Any]:
"""
Make an API call with boto3 and get response.
:return: response
:rtype: dict[str, Any]
"""
raise NotImplementedError('Please implement get_emr_response() in subclass')
@staticmethod
[docs] def state_from_response(response: Dict[str, Any]) -> str:
"""
Get state from response dictionary.
:param response: response from AWS API
:return: state
:rtype: str
"""
raise NotImplementedError('Please implement state_from_response() in subclass')
@staticmethod
[docs] def failure_message_from_response(response: Dict[str, Any]) -> Optional[str]:
"""
Get failure message from response dictionary.
:param response: response from AWS API
:return: failure message
:rtype: Optional[str]
"""
raise NotImplementedError('Please implement failure_message_from_response() in subclass')
[docs]class EmrContainerSensor(BaseSensorOperator):
"""
Asks for the state of the job run until it reaches a failure state or success state.
If the job run fails, the task will fail.
.. seealso::
For more information on how to use this sensor, take a look at the guide:
:ref:`howto/sensor:EmrContainerSensor`
:param job_id: job_id to check the state of
:param max_retries: Number of times to poll for query state before
returning the current state, defaults to None
:param aws_conn_id: aws connection to use, defaults to 'aws_default'
:param poll_interval: Time in seconds to wait between two consecutive call to
check query status on athena, defaults to 10
"""
)
[docs] FAILURE_STATES = (
"FAILED",
"CANCELLED",
"CANCEL_PENDING",
)
[docs] SUCCESS_STATES = ("COMPLETED",)
[docs] template_fields: Sequence[str] = ('virtual_cluster_id', 'job_id')
[docs] template_ext: Sequence[str] = ()
def __init__(
self,
*,
virtual_cluster_id: str,
job_id: str,
max_retries: Optional[int] = None,
aws_conn_id: str = 'aws_default',
poll_interval: int = 10,
**kwargs: Any,
) -> None:
super().__init__(**kwargs)
self.aws_conn_id = aws_conn_id
self.virtual_cluster_id = virtual_cluster_id
self.job_id = job_id
self.poll_interval = poll_interval
self.max_retries = max_retries
[docs] def poke(self, context: 'Context') -> bool:
state = self.hook.poll_query_status(self.job_id, self.max_retries, self.poll_interval)
if state in self.FAILURE_STATES:
raise AirflowException('EMR Containers sensor failed')
if state in self.INTERMEDIATE_STATES:
return False
return True
@cached_property
[docs] def hook(self) -> EmrContainerHook:
"""Create and return an EmrContainerHook"""
return EmrContainerHook(self.aws_conn_id, virtual_cluster_id=self.virtual_cluster_id)
[docs]class EmrJobFlowSensor(EmrBaseSensor):
"""
Asks for the state of the EMR JobFlow (Cluster) until it reaches
any of the target states.
If it fails the sensor errors, failing the task.
With the default target states, sensor waits cluster to be terminated.
When target_states is set to ['RUNNING', 'WAITING'] sensor waits
until job flow to be ready (after 'STARTING' and 'BOOTSTRAPPING' states)
.. seealso::
For more information on how to use this sensor, take a look at the guide:
:ref:`howto/sensor:EmrJobFlowSensor`
:param job_flow_id: job_flow_id to check the state of
:param target_states: the target states, sensor waits until
job flow reaches any of these states
:param failed_states: the failure states, sensor fails when
job flow reaches any of these states
"""
[docs] template_fields: Sequence[str] = ('job_flow_id', 'target_states', 'failed_states')
[docs] template_ext: Sequence[str] = ()
def __init__(
self,
*,
job_flow_id: str,
target_states: Optional[Iterable[str]] = None,
failed_states: Optional[Iterable[str]] = None,
**kwargs,
):
super().__init__(**kwargs)
self.job_flow_id = job_flow_id
self.target_states = target_states or ['TERMINATED']
self.failed_states = failed_states or ['TERMINATED_WITH_ERRORS']
[docs] def get_emr_response(self) -> Dict[str, Any]:
"""
Make an API call with boto3 and get cluster-level details.
.. seealso::
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/emr.html#EMR.Client.describe_cluster
:return: response
:rtype: dict[str, Any]
"""
emr_client = self.get_hook().get_conn()
self.log.info('Poking cluster %s', self.job_flow_id)
return emr_client.describe_cluster(ClusterId=self.job_flow_id)
@staticmethod
[docs] def state_from_response(response: Dict[str, Any]) -> str:
"""
Get state from response dictionary.
:param response: response from AWS API
:return: current state of the cluster
:rtype: str
"""
return response['Cluster']['Status']['State']
@staticmethod
[docs] def failure_message_from_response(response: Dict[str, Any]) -> Optional[str]:
"""
Get failure message from response dictionary.
:param response: response from AWS API
:return: failure message
:rtype: Optional[str]
"""
cluster_status = response['Cluster']['Status']
state_change_reason = cluster_status.get('StateChangeReason')
if state_change_reason:
return (
f"for code: {state_change_reason.get('Code', 'No code')} "
f"with message {state_change_reason.get('Message', 'Unknown')}"
)
return None
[docs]class EmrStepSensor(EmrBaseSensor):
"""
Asks for the state of the step until it reaches any of the target states.
If it fails the sensor errors, failing the task.
With the default target states, sensor waits step to be completed.
.. seealso::
For more information on how to use this sensor, take a look at the guide:
:ref:`howto/sensor:EmrStepSensor`
:param job_flow_id: job_flow_id which contains the step check the state of
:param step_id: step to check the state of
:param target_states: the target states, sensor waits until
step reaches any of these states
:param failed_states: the failure states, sensor fails when
step reaches any of these states
"""
[docs] template_fields: Sequence[str] = ('job_flow_id', 'step_id', 'target_states', 'failed_states')
[docs] template_ext: Sequence[str] = ()
def __init__(
self,
*,
job_flow_id: str,
step_id: str,
target_states: Optional[Iterable[str]] = None,
failed_states: Optional[Iterable[str]] = None,
**kwargs,
):
super().__init__(**kwargs)
self.job_flow_id = job_flow_id
self.step_id = step_id
self.target_states = target_states or ['COMPLETED']
self.failed_states = failed_states or ['CANCELLED', 'FAILED', 'INTERRUPTED']
[docs] def get_emr_response(self) -> Dict[str, Any]:
"""
Make an API call with boto3 and get details about the cluster step.
.. seealso::
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/emr.html#EMR.Client.describe_step
:return: response
:rtype: dict[str, Any]
"""
emr_client = self.get_hook().get_conn()
self.log.info('Poking step %s on cluster %s', self.step_id, self.job_flow_id)
return emr_client.describe_step(ClusterId=self.job_flow_id, StepId=self.step_id)
@staticmethod
[docs] def state_from_response(response: Dict[str, Any]) -> str:
"""
Get state from response dictionary.
:param response: response from AWS API
:return: execution state of the cluster step
:rtype: str
"""
return response['Step']['Status']['State']
@staticmethod
[docs] def failure_message_from_response(response: Dict[str, Any]) -> Optional[str]:
"""
Get failure message from response dictionary.
:param response: response from AWS API
:return: failure message
:rtype: Optional[str]
"""
fail_details = response['Step']['Status'].get('FailureDetails')
if fail_details:
return (
f"for reason {fail_details.get('Reason')} "
f"with message {fail_details.get('Message')} and log file {fail_details.get('LogFile')}"
)
return None
