airflow.hooks.webhdfs_hook

Module Contents

airflow.hooks.webhdfs_hook._kerberos_security_mode[source]
airflow.hooks.webhdfs_hook.log[source]
exception airflow.hooks.webhdfs_hook.AirflowWebHDFSHookException[source]

Bases: airflow.exceptions.AirflowException

class airflow.hooks.webhdfs_hook.WebHDFSHook(webhdfs_conn_id='webhdfs_default', proxy_user=None)[source]

Bases: airflow.hooks.base_hook.BaseHook

Interact with HDFS. This class is a wrapper around the hdfscli library.

Parameters

  • webhdfs_conn_id (str) – The connection id for the webhdfs client to connect to.

  • proxy_user (str) – The user used to authenticate.

get_conn(self)[source]

Establishes a connection depending on the security mode set via config or environment variable.

Returns

a hdfscli InsecureClient or KerberosClient object.

Return type

hdfs.InsecureClient or hdfs.ext.kerberos.KerberosClient

_get_client(self, connection)[source]
check_for_path(self, hdfs_path)[source]

Check for the existence of a path in HDFS by querying FileStatus.

Parameters

hdfs_path (str) – The path to check.

Returns

True if the path exists and False if not.

Return type

bool

load_file(self, source, destination, overwrite=True, parallelism=1, **kwargs)[source]

Uploads a file to HDFS.

Parameters

  • source (str) – Local path to file or folder. If it’s a folder, all the files inside of it will be uploaded. .. note:: This implies that folders empty of files will not be created remotely.

  • destination (str) – PTarget HDFS path. If it already exists and is a directory, files will be uploaded inside.

  • overwrite (bool) – Overwrite any existing file or directory.

  • parallelism (int) – Number of threads to use for parallelization. A value of 0 (or negative) uses as many threads as there are files.

  • **kwargs – Keyword arguments forwarded to hdfs.client.Client.upload().