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Exercise 03

The document outlines file management tasks in Hadoop's HDFS, including adding, retrieving, and deleting files and directories. It provides specific commands for each task, such as creating directories, copying files from local to HDFS, and listing items in HDFS. The expected outcome is the successful installation of Hadoop in three operating modes.

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106 views2 pages

Exercise 03

The document outlines file management tasks in Hadoop's HDFS, including adding, retrieving, and deleting files and directories. It provides specific commands for each task, such as creating directories, copying files from local to HDFS, and listing items in HDFS. The expected outcome is the successful installation of Hadoop in three operating modes.

Uploaded by

bollavenkatareddy603
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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EXERCISE-3:

AIM:- Implement the following file management tasks in Hadoop:

 Adding files and directories


 Retrieving files
 Deleting Files
DESCRIPTION:-
HDFS is a scalable distributed filesystem designed to scale to petabytes of
data while running on top of the underlying filesystem of the operating system.
HDFS keeps track of where the data resides in a network by associating the name
of its rack (or network switch) with the dataset. This allows Hadoop to efficiently
schedule tasks to those nodes that contain data, or which are nearest to it,
optimizing bandwidth utilization. Hadoop provides a set of command line utilities
that work similarly to the Linux file commands, and serve as your primary
interface with HDFS. We‘re going to have a look into HDFS by interacting with it
from the command line.

We will take a look at the most common file management tasks in Hadoop, which
include:

 Adding files and directories to HDFS


 Retrieving files from HDFS to local filesystem
 Deleting files from HDFS
ALGORITHM:-

SYNTAX AND COMMANDS TO ADD, RETRIEVE AND DELETE DATA FROM HDFS

Step-1: Adding Files and Directories to HDFS

Before you can run Hadoop programs on data stored in HDFS, you‘ll need
to put the data into HDFS first. Let‘s create a directory and put a file in it. HDFS
has a default working directory of /user/$USER, where $USER is your login user
name. This directory isn‘t automatically created for you, though, so let‘s create it
with the mkdir command. For the purpose of illustration, we use chuck. You
should substitute your user name in the example commands.
hadoop fs -mkdir /user/chuck
hadoop fs -put example.txt
hadoop fs -put example.txt /user/chuck
Step-2 : Retrieving Files from HDFS

The Hadoop command get copies files from HDFS back to the local
filesystem. To retrieve example.txt, we can run the following command.
hadoop fs -cat example.txt

Step-3: Deleting Files from HDFS

hadoop fs -rm example.txt

 Command for creating a directory in hdfs is “hdfs dfs –mkdir /lendicse”


 Adding directory is done through the command “hdfs dfs –put lendi_english /”.

Step-4: Copying Data from NFS to HDFS

Copying from directory command is “hdfs dfs –copyFromLocal /home /lendi/ Desktop/ shakes/
glossary /lendicse/”

 View the file by using the command “hdfs dfs –cat /lendi_english/glossary”
 Command for listing of items in Hadoop is “hdfs dfs –ls hdfs://localhost:9000/”
 Command for Deleting files is “hdfs dfs –rm r /kartheek”

EXPECTED OUTPUT:

Result: Thus the Installing of Hadoop in three operating modes has been successfully
completed

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