Source code for airflow.providers.apache.hdfs.sensors.web_hdfs

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from __future__ import annotations

from collections.abc import Sequence
from typing import TYPE_CHECKING, Any

from airflow.sensors.base import BaseSensorOperator

if TYPE_CHECKING:
    from hdfs import InsecureClient
    from hdfs.ext.kerberos import KerberosClient

    from airflow.utils.context import Context


[docs]class WebHdfsSensor(BaseSensorOperator): """Waits for a file or folder to land in HDFS."""
[docs] template_fields: Sequence[str] = ("filepath",)
def __init__(self, *, filepath: str, webhdfs_conn_id: str = "webhdfs_default", **kwargs: Any) -> None: super().__init__(**kwargs) self.filepath = filepath self.webhdfs_conn_id = webhdfs_conn_id
[docs] def poke(self, context: Context) -> bool: from airflow.providers.apache.hdfs.hooks.webhdfs import WebHDFSHook hook = WebHDFSHook(self.webhdfs_conn_id) self.log.info("Poking for file %s", self.filepath) return hook.check_for_path(hdfs_path=self.filepath)
[docs]class MultipleFilesWebHdfsSensor(BaseSensorOperator): """Waits for multiple files in a folder to land in HDFS."""
[docs] template_fields: Sequence[str] = ("directory_path", "expected_filenames")
def __init__( self, *, directory_path: str, expected_filenames: Sequence[str], webhdfs_conn_id: str = "webhdfs_default", **kwargs: Any, ) -> None: super().__init__(**kwargs) self.directory_path = directory_path self.expected_filenames = expected_filenames self.webhdfs_conn_id = webhdfs_conn_id
[docs] def poke(self, context: Context) -> bool: from airflow.providers.apache.hdfs.hooks.webhdfs import WebHDFSHook hook = WebHDFSHook(self.webhdfs_conn_id) conn: KerberosClient | InsecureClient = hook.get_conn() actual_files = set(conn.list(self.directory_path)) self.log.debug("Files Found in directory: %s", actual_files) missing_files = set(self.expected_filenames) - actual_files if missing_files: self.log.info("There are missing files: %s", missing_files) return False return True

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