airflow hive_to_samba 源码
airflow hive_to_samba 代码
文件路径：/airflow/providers/apache/hive/transfers/hive_to_samba.py
#
# 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.
"""This module contains an operator to move data from Hive to Samba."""
from __future__ import annotations
from tempfile import NamedTemporaryFile
from typing import TYPE_CHECKING, Sequence
from airflow.models import BaseOperator
from airflow.providers.apache.hive.hooks.hive import HiveServer2Hook
from airflow.providers.samba.hooks.samba import SambaHook
from airflow.utils.operator_helpers import context_to_airflow_vars
if TYPE_CHECKING:
from airflow.utils.context import Context
class HiveToSambaOperator(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)
:param destination_filepath: the file path to where the file will be pushed onto samba
:param samba_conn_id: reference to the samba destination
:param hiveserver2_conn_id: Reference to the
:ref: `Hive Server2 thrift service connection id <howto/connection:hiveserver2>`.
"""
template_fields: Sequence[str] = ('hql', 'destination_filepath')
template_ext: Sequence[str] = (
'.hql',
'.sql',
)
template_fields_renderers = {'hql': 'hql'}
def __init__(
self,
*,
hql: str,
destination_filepath: str,
samba_conn_id: str = 'samba_default',
hiveserver2_conn_id: str = 'hiveserver2_default',
**kwargs,
) -> None:
super().__init__(**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: Context):
with NamedTemporaryFile() as tmp_file:
self.log.info("Fetching file from Hive")
hive = HiveServer2Hook(hiveserver2_conn_id=self.hiveserver2_conn_id)
hive.to_csv(self.hql, csv_filepath=tmp_file.name, hive_conf=context_to_airflow_vars(context))
self.log.info("Pushing to samba")
samba = SambaHook(samba_conn_id=self.samba_conn_id)
samba.push_from_local(self.destination_filepath, tmp_file.name)
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