Source code for airflow.operators.hive_to_samba_operator

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import tempfile

from airflow.hooks.hive_hooks import HiveServer2Hook
from airflow.hooks.samba_hook import SambaHook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults


[docs]class Hive2SambaOperator(BaseOperator): """ Executes hql code in a specific Hive database and loads the results of the query as a csv to a Samba location. :param hql: the hql to be exported. (templated) :type hql: string :param hiveserver2_conn_id: reference to the hiveserver2 service :type hiveserver2_conn_id: string :param samba_conn_id: reference to the samba destination :type samba_conn_id: string """ template_fields = ('hql', 'destination_filepath') template_ext = ('.hql', '.sql',) @apply_defaults def __init__( self, hql, destination_filepath, samba_conn_id='samba_default', hiveserver2_conn_id='hiveserver2_default', *args, **kwargs): super(Hive2SambaOperator, self).__init__(*args, **kwargs) self.hiveserver2_conn_id = hiveserver2_conn_id self.samba_conn_id = samba_conn_id self.destination_filepath = destination_filepath self.hql = hql.strip().rstrip(';') def execute(self, context): samba = SambaHook(samba_conn_id=self.samba_conn_id) hive = HiveServer2Hook(hiveserver2_conn_id=self.hiveserver2_conn_id) tmpfile = tempfile.NamedTemporaryFile() self.log.info("Fetching file from Hive") hive.to_csv(hql=self.hql, csv_filepath=tmpfile.name) self.log.info("Pushing to samba") samba.push_from_local(self.destination_filepath, tmpfile.name)