47 строки
1.5 KiB
Python
47 строки
1.5 KiB
Python
import logging
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import tempfile
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from airflow.hooks import HiveServer2Hook, SambaHook
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from airflow.models import BaseOperator
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from airflow.utils import apply_defaults
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class Hive2SambaOperator(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 exported
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:type hql: string
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:param hiveserver2_conn_id: reference to the hiveserver2 service
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:type hiveserver2_conn_id: string
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:param samba_conn_id: reference to the samba destination
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:type samba_conn_id: string
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"""
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__mapper_args__ = {
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'polymorphic_identity': 'Hive2SambaOperator'
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}
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template_fields = ('hql', 'destination_filepath')
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template_ext = ('.hql', '.sql',)
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@apply_defaults
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def __init__(
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self, hql,
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destination_filepath,
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samba_conn_id='samba_default',
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hiveserver2_conn_id='hiveserver2_default',
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*args, **kwargs):
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super(Hive2SambaOperator, self).__init__(*args, **kwargs)
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self.hiveserver2_conn_id = hiveserver2_conn_id
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self.samba_conn_id = samba_conn_id
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self.destination_filepath = destination_filepath
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self.samba = SambaHook(samba_conn_id=samba_conn_id)
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self.hook = HiveServer2Hook(hiveserver2_conn_id=hiveserver2_conn_id)
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self.hql = hql.strip().rstrip(';')
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def execute(self, context):
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tmpfile = tempfile.NamedTemporaryFile()
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self.hook.to_csv(hql=self.hql, csv_filepath=tmpfile.name)
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self.samba.push_from_local(self.destination_filepath, tmpfile.name)
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