Source code for airflow.operators.hive_to_samba_operator

# -*- coding: utf-8 -*-
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

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
from airflow.utils.operator_helpers import context_to_airflow_vars


[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: str :param hiveserver2_conn_id: reference to the hiveserver2 service :type hiveserver2_conn_id: str :param samba_conn_id: reference to the samba destination :type samba_conn_id: str """
[docs] template_fields = ('hql', 'destination_filepath')
[docs] 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(';')
[docs] 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, hive_conf=context_to_airflow_vars(context)) self.log.info("Pushing to samba") samba.push_from_local(self.destination_filepath, tmpfile.name)