# -*- 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.
#
from uuid import uuid4
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
from airflow.contrib.hooks.aws_athena_hook import AWSAthenaHook
[docs]class AWSAthenaOperator(BaseOperator):
"""
An operator that submit presto query to athena.
If ``do_xcom_push`` is True, the QueryExecutionID assigned to the
query will be pushed to an XCom when it successfuly completes.
:param query: Presto to be run on athena. (templated)
:type query: str
:param database: Database to select. (templated)
:type database: str
:param output_location: s3 path to write the query results into. (templated)
:type output_location: str
:param aws_conn_id: aws connection to use
:type aws_conn_id: str
:param sleep_time: Time to wait between two consecutive call to check query status on athena
:type sleep_time: int
:param max_tries: Number of times to poll for query state before function exits
:type max_triex: int
"""
[docs] template_fields = ('query', 'database', 'output_location')
[docs] template_ext = ('.sql', )
@apply_defaults
def __init__(self, query, database, output_location, aws_conn_id='aws_default', client_request_token=None,
query_execution_context=None, result_configuration=None, sleep_time=30, max_tries=None,
*args, **kwargs):
super(AWSAthenaOperator, self).__init__(*args, **kwargs)
self.query = query
self.database = database
self.output_location = output_location
self.aws_conn_id = aws_conn_id
self.client_request_token = client_request_token or str(uuid4())
self.query_execution_context = query_execution_context or {}
self.result_configuration = result_configuration or {}
self.sleep_time = sleep_time
self.max_tries = max_tries
self.query_execution_id = None
self.hook = None
[docs] def get_hook(self):
return AWSAthenaHook(self.aws_conn_id, self.sleep_time)
[docs] def execute(self, context):
"""
Run Presto Query on Athena
"""
self.hook = self.get_hook()
self.query_execution_context['Database'] = self.database
self.result_configuration['OutputLocation'] = self.output_location
self.query_execution_id = self.hook.run_query(self.query, self.query_execution_context,
self.result_configuration, self.client_request_token)
query_status = self.hook.poll_query_status(self.query_execution_id, self.max_tries)
if query_status in AWSAthenaHook.FAILURE_STATES:
error_message = self.hook.get_state_change_reason(self.query_execution_id)
raise Exception(
'Final state of Athena job is {}, query_execution_id is {}. Error: {}'
.format(query_status, self.query_execution_id, error_message))
elif not query_status or query_status in AWSAthenaHook.INTERMEDIATE_STATES:
raise Exception(
'Final state of Athena job is {}. '
'Max tries of poll status exceeded, query_execution_id is {}.'
.format(query_status, self.query_execution_id))
return self.query_execution_id
[docs] def on_kill(self):
"""
Cancel the submitted athena query
"""
if self.query_execution_id:
self.log.info('⚰️⚰️⚰️ Received a kill Signal. Time to Die')
self.log.info(
'Stopping Query with executionId - %s', self.query_execution_id
)
response = self.hook.stop_query(self.query_execution_id)
http_status_code = None
try:
http_status_code = response['ResponseMetadata']['HTTPStatusCode']
except Exception as ex:
self.log.error('Exception while cancelling query', ex)
finally:
if http_status_code is None or http_status_code != 200:
self.log.error('Unable to request query cancel on athena. Exiting')
else:
self.log.info(
'Polling Athena for query with id %s to reach final state', self.query_execution_id
)
self.hook.poll_query_status(self.query_execution_id)