| # |
| # 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 subprocess import check_output |
| |
| class Engine(object): |
| |
| def __init__(self,db,conf, pipeline): |
| |
| self._daemon_node = conf['impala_daemon'] |
| self._db = db |
| self._pipeline = pipeline |
| impala_cmd = "impala-shell -i {0} --quiet -q 'INVALIDATE METADATA {1}.{2}'".format(self._daemon_node,self._db, self._pipeline) |
| check_output(impala_cmd,shell=True) |
| |
| impala_cmd = "impala-shell -i {0} --quiet -q 'REFRESH {1}.{2}'".format(self._daemon_node,self._db, self._pipeline) |
| check_output(impala_cmd,shell=True) |
| |
| def query(self,query,output_file=None,delimiter=","): |
| |
| if output_file: |
| impala_cmd = "impala-shell -i {0} --quiet --print_header -B --output_delimiter='{1}' -q \"{2}\" -o {3}".format(self._daemon_node,delimiter,query,output_file) |
| else: |
| impala_cmd = "impala-shell -i {0} --quiet --print_header -B --output_delimiter='{1}' -q \"{2}\"".format(self._daemon_node,delimiter,query) |
| |
| check_output(impala_cmd,shell=True) |
