| # -*- 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 re |
| |
| from airflow.hooks.pig_hook import PigCliHook |
| from airflow.models import BaseOperator |
| from airflow.utils.decorators import apply_defaults |
| |
| |
| class PigOperator(BaseOperator): |
| """ |
| Executes pig script. |
| |
| :param pig: the pig latin script to be executed. (templated) |
| :type pig: str |
| :param pig_cli_conn_id: reference to the Hive database |
| :type pig_cli_conn_id: str |
| :param pigparams_jinja_translate: when True, pig params-type templating |
| ${var} gets translated into jinja-type templating {{ var }}. Note that |
| you may want to use this along with the |
| ``DAG(user_defined_macros=myargs)`` parameter. View the DAG |
| object documentation for more details. |
| :type pigparams_jinja_translate: bool |
| :param pig_opts: pig options, such as: -x tez, -useHCatalog, ... |
| :type pig_opts: str |
| """ |
| |
| template_fields = ('pig',) |
| template_ext = ('.pig', '.piglatin',) |
| ui_color = '#f0e4ec' |
| |
| @apply_defaults |
| def __init__( |
| self, pig, |
| pig_cli_conn_id='pig_cli_default', |
| pigparams_jinja_translate=False, |
| pig_opts=None, |
| *args, **kwargs): |
| |
| super(PigOperator, self).__init__(*args, **kwargs) |
| self.pigparams_jinja_translate = pigparams_jinja_translate |
| self.pig = pig |
| self.pig_cli_conn_id = pig_cli_conn_id |
| self.pig_opts = pig_opts |
| |
| def get_hook(self): |
| return PigCliHook(pig_cli_conn_id=self.pig_cli_conn_id) |
| |
| def prepare_template(self): |
| if self.pigparams_jinja_translate: |
| self.pig = re.sub( |
| r"(\$([a-zA-Z_][a-zA-Z0-9_]*))", r"{{ \g<2> }}", self.pig) |
| |
| def execute(self, context): |
| self.log.info('Executing: %s', self.pig) |
| self.hook = self.get_hook() |
| self.hook.run_cli(pig=self.pig, pig_opts=self.pig_opts) |
| |
| def on_kill(self): |
| self.hook.kill() |
