# -*- coding: utf-8 -*-
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from airflow.sensors.base_sensor_operator import BaseSensorOperator
from airflow.utils.decorators import apply_defaults
[docs]class WebHdfsSensor(BaseSensorOperator):
"""
Waits for a file or folder to land in HDFS
"""
template_fields = ('filepath',)
@apply_defaults
def __init__(self,
filepath,
webhdfs_conn_id='webhdfs_default',
*args,
**kwargs):
super(WebHdfsSensor, self).__init__(*args, **kwargs)
self.filepath = filepath
self.webhdfs_conn_id = webhdfs_conn_id
[docs] def poke(self, context):
from airflow.hooks.webhdfs_hook import WebHDFSHook
c = WebHDFSHook(self.webhdfs_conn_id)
self.log.info('Poking for file {self.filepath}'.format(**locals()))
return c.check_for_path(hdfs_path=self.filepath)