Source code for airflow.sensors.named_hive_partition_sensor

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from past.builtins import basestring

from airflow.sensors.base_sensor_operator import BaseSensorOperator
from airflow.utils.decorators import apply_defaults

[docs]class NamedHivePartitionSensor(BaseSensorOperator): """ Waits for a set of partitions to show up in Hive. :param partition_names: List of fully qualified names of the partitions to wait for. A fully qualified name is of the form ``schema.table/pk1=pv1/pk2=pv2``, for example, default.users/ds=2016-01-01. This is passed as is to the metastore Thrift client ``get_partitions_by_name`` method. Note that you cannot use logical or comparison operators as in HivePartitionSensor. :type partition_names: list of strings :param metastore_conn_id: reference to the metastore thrift service connection id :type metastore_conn_id: str """ template_fields = ('partition_names',) ui_color = '#8d99ae' @apply_defaults def __init__(self, partition_names, metastore_conn_id='metastore_default', poke_interval=60 * 3, hook=None, *args, **kwargs): super(NamedHivePartitionSensor, self).__init__( poke_interval=poke_interval, *args, **kwargs) if isinstance(partition_names, basestring): raise TypeError('partition_names must be an array of strings') self.metastore_conn_id = metastore_conn_id self.partition_names = partition_names self.hook = hook if self.hook and metastore_conn_id != 'metastore_default': self.log.warning('A hook was passed but a non default' 'metastore_conn_id=' '{} was used'.format(metastore_conn_id)) @staticmethod def parse_partition_name(partition): first_split = partition.split('.', 1) if len(first_split) == 1: schema = 'default' table_partition = max(first_split) # poor man first else: schema, table_partition = first_split second_split = table_partition.split('/', 1) if len(second_split) == 1: raise ValueError('Could not parse ' + partition + 'into table, partition') else: table, partition = second_split return schema, table, partition def poke_partition(self, partition): if not self.hook: from airflow.hooks.hive_hooks import HiveMetastoreHook self.hook = HiveMetastoreHook( metastore_conn_id=self.metastore_conn_id) schema, table, partition = self.parse_partition_name(partition) 'Poking for {schema}.{table}/{partition}'.format(**locals()) ) return self.hook.check_for_named_partition( schema, table, partition)
[docs] def poke(self, context): self.partition_names = [ partition_name for partition_name in self.partition_names if not self.poke_partition(partition_name) ] return not self.partition_names