Source code for airflow.contrib.hooks.emr_hook

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from airflow.exceptions import AirflowException
from airflow.contrib.hooks.aws_hook import AwsHook


[docs]class EmrHook(AwsHook): """ Interact with AWS EMR. emr_conn_id is only neccessary for using the create_job_flow method. """ def __init__(self, emr_conn_id=None, *args, **kwargs): self.emr_conn_id = emr_conn_id super(EmrHook, self).__init__(*args, **kwargs) def get_conn(self): self.conn = self.get_client_type('emr') return self.conn
[docs] def create_job_flow(self, job_flow_overrides): """ 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( Name=config.get('Name'), LogUri=config.get('LogUri'), ReleaseLabel=config.get('ReleaseLabel'), Instances=config.get('Instances'), Steps=config.get('Steps', []), BootstrapActions=config.get('BootstrapActions', []), Applications=config.get('Applications'), Configurations=config.get('Configurations', []), VisibleToAllUsers=config.get('VisibleToAllUsers'), JobFlowRole=config.get('JobFlowRole'), ServiceRole=config.get('ServiceRole'), Tags=config.get('Tags') ) return response