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You're reading from  Hadoop 2.x Administration Cookbook

Product typeBook
Published inMay 2017
PublisherPackt
ISBN-139781787126732
Edition1st Edition
Tools
Hadoop
Concepts
System Administration
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Author (1)
Aman Singh
Aman Singh
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Aman Singh

Gurmukh Singh is a seasoned technology professional with 14+ years of industry experience in infrastructure design, distributed systems, performance optimization, and networks. He has worked in big data domain for the last 5 years and provides consultancy and training on various technologies. He has worked with companies such as HP, JP Morgan, and Yahoo. He has authored Monitoring Hadoop by Packt Publishing
Read more about Aman Singh

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HDFS snapshots

In spite of having high availability and replication factor as three, there are chances of data loss due to accidental deletions or corruptions. What if the user wants to restore the HDFS state to a previous point in time? Can that be done?

To address these issues, HDFS supports snapshots, which is a kind of backup in a point of time. However, snapshots do not occupy any extra space, as these are simply pointers to the original data blocks.

In this recipe, we will see how the snapshots can be enabled and configured.

Getting ready

Make sure that the user has a running cluster with HDFS configured. The user must be able to execute HDFS commands and copy some data to the cluster.

How to do it...

  1. Connect to the master1.cyrus.com Namenode and switch to the user hadoop.

  2. The first step is to enable a snapshot on a directory, as shown in the following command:

    $ hdfs dfsadmin -allowSnapshot /projects

  3. The preceding command makes a directory snapshot able and .snapshot directory will be created...

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Hadoop 2.x Administration Cookbook
Published in: May 2017Publisher: PacktISBN-13: 9781787126732
© 2017 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Aman Singh

Gurmukh Singh is a seasoned technology professional with 14+ years of industry experience in infrastructure design, distributed systems, performance optimization, and networks. He has worked in big data domain for the last 5 years and provides consultancy and training on various technologies. He has worked with companies such as HP, JP Morgan, and Yahoo. He has authored Monitoring Hadoop by Packt Publishing
Read more about Aman Singh

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