59 строки
1.9 KiB
Python
59 строки
1.9 KiB
Python
import logging
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import re
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from airflow.hooks import HiveCliHook
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from airflow.models import BaseOperator
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from airflow.utils import apply_defaults
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class HiveOperator(BaseOperator):
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"""
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Executes hql code in a specific Hive database.
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:param hql: the hql to be executed
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:type hql: string
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:param hive_cli_conn_id: reference to the Hive database
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:type hive_cli_conn_id: string
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:param hiveconf_jinja_translate: when True, hiveconf-type templating
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${var} gets translated into jina-type templating {{ var }}
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:type hiveconf_jinja_translate: boolean
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:param script_begin_tag: If defined, the operator will get rid of the
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part of the script before the first occurence of `script_begin_tag`
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:type script_begin_tag: str
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"""
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__mapper_args__ = {
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'polymorphic_identity': 'HiveOperator'
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}
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template_fields = ('hql',)
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template_ext = ('.hql', '.sql',)
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ui_color = '#f0e4ec'
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@apply_defaults
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def __init__(
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self, hql,
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hive_cli_conn_id='hive_cli_default',
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hiveconf_jinja_translate=False,
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script_begin_tag=None,
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*args, **kwargs):
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super(HiveOperator, self).__init__(*args, **kwargs)
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self.hiveconf_jinja_translate = hiveconf_jinja_translate
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self.hook = HiveCliHook(hive_cli_conn_id=hive_cli_conn_id)
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self.hql = hql
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self.script_begin_tag = script_begin_tag
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def prepare_template(self):
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if self.hiveconf_jinja_translate:
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self.hql = re.sub(
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"(\$\{([ a-zA-Z0-9_]*)\})", "{{ \g<2> }}", self.hql)
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if self.script_begin_tag and self.script_begin_tag in self.hql:
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self.hql = "\n".join(self.hql.split(self.script_begin_tag)[1:])
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def execute(self, context):
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logging.info('Executing: ' + self.hql)
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self.hook.run_cli(hql=self.hql)
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def on_kill(self):
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self.hook.kill()
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