Python - Read & Write files from HDFS

Gist Page : example-python-read-and-write-from-hdfs

Common part

Libraries dependency

import pandas as pd
from hdfs import InsecureClient
import os


WEBHDFS URI are like that : http://namenodedns:port/user/hdfs/folder/file.csv

Default port is 50070


# Connecting to Webhdfs by providing hdfs host ip and webhdfs port (50070 by default)
client_hdfs = InsecureClient('http://' + os.environ['IP_HDFS'] + ':50070')

How to write a file to HDFS with Python ?

Code example

# Creating a simple Pandas DataFrame
liste_hello = ['hello1','hello2']
liste_world = ['world1','world2']
df = pd.DataFrame(data = {'hello' : liste_hello, 'world': liste_world})

# Writing Dataframe to hdfs
with client_hdfs.write('/user/hdfs/wiki/helloworld.csv', encoding = 'utf-8') as writer:

How to read a file from HDFS with Python ?

Code example

# ====== Reading files ======
with'/user/hdfs/wiki/helloworld.csv', encoding = 'utf-8') as reader:
	df = pd.read_csv(reader,index_col=0)