Python HDFS client
Because the world needs yet another way to talk to HDFS from Python.
Usage
This library provides a Python client for WebHDFS. NameNode HA is supported by passing in both NameNodes. Responses are returned as nice Python classes, and any failed operation will raise some subclass of HdfsException matching the Java exception.
Example usage:
>>> fs = pyhdfs.HdfsClient(hosts='nn1.example.com:50070,nn2.example.com:50070', user_name='someone')
>>> fs.list_status('/')
[FileStatus(pathSuffix='benchmarks', permission='777', type='DIRECTORY', ...), FileStatus(...), ...]
>>> fs.listdir('/')
['benchmarks', 'hbase', 'solr', 'tmp', 'user', 'var']
>>> fs.mkdirs('/fruit/x/y')
True
>>> fs.create('/fruit/apple', 'delicious')
>>> fs.append('/fruit/apple', ' food')
>>> with contextlib.closing(fs.open('/fruit/apple')) as f:
... f.read()
...
b'delicious food'
>>> fs.get_file_status('/fruit/apple')
FileStatus(length=14, owner='someone', type='FILE', ...)
>>> fs.get_file_status('/fruit/apple').owner
'someone'
>>> fs.get_content_summary('/fruit')
ContentSummary(directoryCount=3, fileCount=1, length=14, quota=-1, spaceConsumed=14, spaceQuota=-1)
>>> list(fs.walk('/fruit'))
[('/fruit', ['x'], ['apple']), ('/fruit/x', ['y'], []), ('/fruit/x/y', [], [])]
>>> fs.exists('/fruit/apple')
True
>>> fs.delete('/fruit')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File ".../pyhdfs.py", line 525, in delete
...
pyhdfs.HdfsPathIsNotEmptyDirectoryException: `/fruit is non empty': Directory is not empty
>>> fs.delete('/fruit', recursive=True)
True
>>> fs.exists('/fruit/apple')
False
>>> issubclass(pyhdfs.HdfsFileNotFoundException, pyhdfs.HdfsIOException)
True
The methods and return values generally map directly to WebHDFS endpoints. The client also provides convenience methods that mimic Python os methods and HDFS CLI commands (e.g. walk and copy_to_local).
pyhdfs logs all HDFS actions at the INFO level, so turning on INFO level logging will give you a debug record for your application.
For more information, see the full API docs.
Installing
pip install pyhdfs
Python 3 is required.
Development testing
First run install-hdfs.sh x.y.z, which will download, extract, and run the HDFS NN/DN processes in the current directory. (Replace x.y.z with a real version.) Then run the following commands. Note they will create and delete hdfs://localhost/tmp/pyhdfs_test.
Commands:
python3 -m venv env source env/bin/activate pip install -e . pip install -r dev_requirements.txt pytest
1k Dec 09, 2022
11 Nov 17, 2022
25.7k Jan 08, 2023
73 Jan 01, 2023
8.3k Jan 08, 2023
4 Jun 03, 2022
74 Dec 23, 2022
5 Oct 08, 2022
4 Aug 08, 2022
6 Nov 13, 2022
23 Dec 17, 2022
140 Dec 27, 2022
2 Oct 27, 2022
14 Oct 15, 2022
12 Jan 07, 2023
25 Nov 09, 2022
4 Feb 24, 2022
31 Sep 28, 2022
20 Dec 24, 2022
5 Jun 03, 2021