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from time import sleep
from typing import Any, Dict, List, Optional
from botocore.exceptions import ClientError
from airflow.exceptions import AirflowException
from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
[docs]class EmrHook(AwsBaseHook):
"""
Interact with AWS EMR. emr_conn_id is only necessary for using the
create_job_flow method.
Additional arguments (such as ``aws_conn_id``) may be specified and
are passed down to the underlying AwsBaseHook.
.. seealso::
:class:`~airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook`
"""
[docs] conn_name_attr = 'emr_conn_id'
[docs] default_conn_name = 'emr_default'
[docs] hook_name = 'Amazon Elastic MapReduce'
def __init__(self, emr_conn_id: Optional[str] = default_conn_name, *args, **kwargs) -> None:
self.emr_conn_id = emr_conn_id
kwargs["client_type"] = "emr"
super().__init__(*args, **kwargs)
[docs] def get_cluster_id_by_name(self, emr_cluster_name: str, cluster_states: List[str]) -> Optional[str]:
"""
Fetch id of EMR cluster with given name and (optional) states.
Will return only if single id is found.
:param emr_cluster_name: Name of a cluster to find
:param cluster_states: State(s) of cluster to find
:return: id of the EMR cluster
"""
response = self.get_conn().list_clusters(ClusterStates=cluster_states)
matching_clusters = list(
filter(lambda cluster: cluster['Name'] == emr_cluster_name, response['Clusters'])
)
if len(matching_clusters) == 1:
cluster_id = matching_clusters[0]['Id']
self.log.info('Found cluster name = %s id = %s', emr_cluster_name, cluster_id)
return cluster_id
elif len(matching_clusters) > 1:
raise AirflowException(f'More than one cluster found for name {emr_cluster_name}')
else:
self.log.info('No cluster found for name %s', emr_cluster_name)
return None
[docs] def create_job_flow(self, job_flow_overrides: Dict[str, Any]) -> Dict[str, Any]:
"""
Creates a job flow using the config from the EMR connection.
Keys of the json extra hash may have the arguments of the boto3
run_job_flow method.
Overrides for this config may be passed as the job_flow_overrides.
"""
if not self.emr_conn_id:
raise AirflowException('emr_conn_id must be present to use create_job_flow')
emr_conn = self.get_connection(self.emr_conn_id)
config = emr_conn.extra_dejson.copy()
config.update(job_flow_overrides)
response = self.get_conn().run_job_flow(**config)
return response
[docs]class EmrContainerHook(AwsBaseHook):
"""
Interact with AWS EMR Virtual Cluster to run, poll jobs and return job status
Additional arguments (such as ``aws_conn_id``) may be specified and
are passed down to the underlying AwsBaseHook.
.. seealso::
:class:`~airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook`
:param virtual_cluster_id: Cluster ID of the EMR on EKS virtual cluster
"""
)
[docs] FAILURE_STATES = (
"FAILED",
"CANCELLED",
"CANCEL_PENDING",
)
[docs] SUCCESS_STATES = ("COMPLETED",)
[docs] TERMINAL_STATES = (
"COMPLETED",
"FAILED",
"CANCELLED",
"CANCEL_PENDING",
)
def __init__(self, *args: Any, virtual_cluster_id: Optional[str] = None, **kwargs: Any) -> None:
super().__init__(client_type="emr-containers", *args, **kwargs) # type: ignore
self.virtual_cluster_id = virtual_cluster_id
[docs] def submit_job(
self,
name: str,
execution_role_arn: str,
release_label: str,
job_driver: dict,
configuration_overrides: Optional[dict] = None,
client_request_token: Optional[str] = None,
tags: Optional[dict] = None,
) -> str:
"""
Submit a job to the EMR Containers API and return the job ID.
A job run is a unit of work, such as a Spark jar, PySpark script,
or SparkSQL query, that you submit to Amazon EMR on EKS.
See: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/emr-containers.html#EMRContainers.Client.start_job_run # noqa: E501
:param name: The name of the job run.
:param execution_role_arn: The IAM role ARN associated with the job run.
:param release_label: The Amazon EMR release version to use for the job run.
:param job_driver: Job configuration details, e.g. the Spark job parameters.
:param configuration_overrides: The configuration overrides for the job run,
specifically either application configuration or monitoring configuration.
:param client_request_token: The client idempotency token of the job run request.
Use this if you want to specify a unique ID to prevent two jobs from getting started.
:param tags: The tags assigned to job runs.
:return: Job ID
"""
params = {
"name": name,
"virtualClusterId": self.virtual_cluster_id,
"executionRoleArn": execution_role_arn,
"releaseLabel": release_label,
"jobDriver": job_driver,
"configurationOverrides": configuration_overrides or {},
"tags": tags or {},
}
if client_request_token:
params["clientToken"] = client_request_token
response = self.conn.start_job_run(**params)
if response['ResponseMetadata']['HTTPStatusCode'] != 200:
raise AirflowException(f'Start Job Run failed: {response}')
else:
self.log.info(
"Start Job Run success - Job Id %s and virtual cluster id %s",
response['id'],
response['virtualClusterId'],
)
return response['id']
[docs] def get_job_failure_reason(self, job_id: str) -> Optional[str]:
"""
Fetch the reason for a job failure (e.g. error message). Returns None or reason string.
:param job_id: Id of submitted job run
:return: str
"""
# We absorb any errors if we can't retrieve the job status
reason = None
try:
response = self.conn.describe_job_run(
virtualClusterId=self.virtual_cluster_id,
id=job_id,
)
failure_reason = response['jobRun']['failureReason']
state_details = response["jobRun"]["stateDetails"]
reason = f"{failure_reason} - {state_details}"
except KeyError:
self.log.error('Could not get status of the EMR on EKS job')
except ClientError as ex:
self.log.error('AWS request failed, check logs for more info: %s', ex)
return reason
[docs] def check_query_status(self, job_id: str) -> Optional[str]:
"""
Fetch the status of submitted job run. Returns None or one of valid query states.
See: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/emr-containers.html#EMRContainers.Client.describe_job_run # noqa: E501
:param job_id: Id of submitted job run
:return: str
"""
try:
response = self.conn.describe_job_run(
virtualClusterId=self.virtual_cluster_id,
id=job_id,
)
return response["jobRun"]["state"]
except self.conn.exceptions.ResourceNotFoundException:
# If the job is not found, we raise an exception as something fatal has happened.
raise AirflowException(f'Job ID {job_id} not found on Virtual Cluster {self.virtual_cluster_id}')
except ClientError as ex:
# If we receive a generic ClientError, we swallow the exception so that the
self.log.error('AWS request failed, check logs for more info: %s', ex)
return None
[docs] def poll_query_status(
self, job_id: str, max_tries: Optional[int] = None, poll_interval: int = 30
) -> Optional[str]:
"""
Poll the status of submitted job run until query state reaches final state.
Returns one of the final states.
:param job_id: Id of submitted job run
:param max_tries: Number of times to poll for query state before function exits
:param poll_interval: Time (in seconds) to wait between calls to check query status on EMR
:return: str
"""
try_number = 1
final_query_state = None # Query state when query reaches final state or max_tries reached
while True:
query_state = self.check_query_status(job_id)
if query_state is None:
self.log.info("Try %s: Invalid query state. Retrying again", try_number)
elif query_state in self.TERMINAL_STATES:
self.log.info("Try %s: Query execution completed. Final state is %s", try_number, query_state)
final_query_state = query_state
break
else:
self.log.info("Try %s: Query is still in non-terminal state - %s", try_number, query_state)
if max_tries and try_number >= max_tries: # Break loop if max_tries reached
final_query_state = query_state
break
try_number += 1
sleep(poll_interval)
return final_query_state
[docs] def stop_query(self, job_id: str) -> Dict:
"""
Cancel the submitted job_run
:param job_id: Id of submitted job_run
:return: dict
"""
return self.conn.cancel_job_run(
virtualClusterId=self.virtual_cluster_id,
id=job_id,
)
