# -*- coding: utf-8 -*-
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import re
from airflow.hooks.pig_hook import PigCliHook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
[docs]class PigOperator(BaseOperator):
"""
Executes pig script.
:param pig: the pig latin script to be executed. (templated)
:type pig: string
:param pig_cli_conn_id: reference to the Hive database
:type pig_cli_conn_id: string
: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: boolean
"""
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,
*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
def get_hook(self):
return PigCliHook(pig_cli_conn_id=self.pig_cli_conn_id)
[docs] def prepare_template(self):
if self.pigparams_jinja_translate:
self.pig = re.sub(
"(\$([a-zA-Z_][a-zA-Z0-9_]*))", "{{ \g<2> }}", self.pig)
[docs] def execute(self, context):
self.log.info('Executing: %s', self.pig)
self.hook = self.get_hook()
self.hook.run_cli(pig=self.pig)
[docs] def on_kill(self):
self.hook.kill()