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from airflow.sensors.base_sensor_operator import BaseSensorOperator
from airflow.utils.decorators import apply_defaults
[docs]class HivePartitionSensor(BaseSensorOperator):
"""
Waits for a partition to show up in Hive.
Note: Because ``partition`` supports general logical operators, it
can be inefficient. Consider using NamedHivePartitionSensor instead if
you don't need the full flexibility of HivePartitionSensor.
:param table: The name of the table to wait for, supports the dot
notation (my_database.my_table)
:type table: str
:param partition: The partition clause to wait for. This is passed as
is to the metastore Thrift client ``get_partitions_by_filter`` method,
and apparently supports SQL like notation as in ``ds='2015-01-01'
AND type='value'`` and comparison operators as in ``"ds>=2015-01-01"``
:type partition: str
:param metastore_conn_id: reference to the metastore thrift service
connection id
:type metastore_conn_id: str
"""
[docs] template_fields = ('schema', 'table', 'partition',)
@apply_defaults
def __init__(self,
table, partition="ds='{{ ds }}'",
metastore_conn_id='metastore_default',
schema='default',
poke_interval=60 * 3,
*args,
**kwargs):
super(HivePartitionSensor, self).__init__(
poke_interval=poke_interval, *args, **kwargs)
if not partition:
partition = "ds='{{ ds }}'"
self.metastore_conn_id = metastore_conn_id
self.table = table
self.partition = partition
self.schema = schema
[docs] def poke(self, context):
if '.' in self.table:
self.schema, self.table = self.table.split('.')
self.log.info(
'Poking for table %s.%s, partition %s', self.schema, self.table, self.partition
)
if not hasattr(self, 'hook'):
from airflow.hooks.hive_hooks import HiveMetastoreHook
self.hook = HiveMetastoreHook(
metastore_conn_id=self.metastore_conn_id)
return self.hook.check_for_partition(
self.schema, self.table, self.partition)