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
![Risky [ Zero Tow ]](https://avatars.githubusercontent.com/u/76860656?v=4&s=60)
7 Dec 25, 2022
1 May 06, 2022
16 May 09, 2022
6 May 17, 2022
31 Sep 28, 2022
5 Oct 08, 2022
29 Dec 04, 2022
7 Oct 22, 2022
534 Dec 14, 2022
51 Dec 15, 2022
18 Nov 22, 2021
65 Nov 17, 2022
1 Dec 11, 2021
4 Aug 31, 2021
3 Dec 30, 2021
33 Nov 24, 2022
6 Jan 30, 2022
58 Nov 15, 2022
430 Dec 27, 2022
1 Dec 25, 2021