Source code for airflow.providers.amazon.aws.operators.emr_create_job_flow
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import ast
from datetime import datetime
from typing import Any, Dict, Optional, Union
from airflow.exceptions import AirflowException
from airflow.models import BaseOperator, BaseOperatorLink, TaskInstance
from airflow.providers.amazon.aws.hooks.emr import EmrHook
[docs]class EmrClusterLink(BaseOperatorLink):
"""Operator link for EmrCreateJobFlowOperator. It allows users to access the EMR Cluster"""
[docs] def get_link(self, operator: BaseOperator, dttm: datetime) -> str:
"""
Get link to EMR cluster.
:param operator: operator
:param dttm: datetime
:return: url link
"""
ti = TaskInstance(task=operator, execution_date=dttm)
flow_id = ti.xcom_pull(task_ids=operator.task_id)
return (
f'https://console.aws.amazon.com/elasticmapreduce/home#cluster-details:{flow_id}'
if flow_id
else ''
)
[docs]class EmrCreateJobFlowOperator(BaseOperator):
"""
Creates an EMR JobFlow, reading the config from the EMR connection.
A dictionary of JobFlow overrides can be passed that override
the config from the connection.
:param aws_conn_id: aws connection to uses
:type aws_conn_id: str
:param emr_conn_id: emr connection to use
:type emr_conn_id: str
:param job_flow_overrides: boto3 style arguments or reference to an arguments file
(must be '.json') to override emr_connection extra. (templated)
:type job_flow_overrides: dict|str
:param region_name: Region named passed to EmrHook
:type region_name: Optional[str]
"""
[docs] template_fields = ['job_flow_overrides']
[docs] template_ext = ('.json',)
[docs] template_fields_renderers = {"job_flow_overrides": "json"}
def __init__(
self,
*,
aws_conn_id: str = 'aws_default',
emr_conn_id: str = 'emr_default',
job_flow_overrides: Optional[Union[str, Dict[str, Any]]] = None,
region_name: Optional[str] = None,
**kwargs,
):
super().__init__(**kwargs)
self.aws_conn_id = aws_conn_id
self.emr_conn_id = emr_conn_id
if job_flow_overrides is None:
job_flow_overrides = {}
self.job_flow_overrides = job_flow_overrides
self.region_name = region_name
[docs] def execute(self, context: Dict[str, Any]) -> str:
emr = EmrHook(
aws_conn_id=self.aws_conn_id, emr_conn_id=self.emr_conn_id, region_name=self.region_name
)
self.log.info(
'Creating JobFlow using aws-conn-id: %s, emr-conn-id: %s', self.aws_conn_id, self.emr_conn_id
)
if isinstance(self.job_flow_overrides, str):
job_flow_overrides: Dict[str, Any] = ast.literal_eval(self.job_flow_overrides)
self.job_flow_overrides = job_flow_overrides
else:
job_flow_overrides = self.job_flow_overrides
response = emr.create_job_flow(job_flow_overrides)
if not response['ResponseMetadata']['HTTPStatusCode'] == 200:
raise AirflowException(f'JobFlow creation failed: {response}')
else:
self.log.info('JobFlow with id %s created', response['JobFlowId'])
return response['JobFlowId']