Book Image

Hadoop Operations and Cluster Management Cookbook

By : Shumin Guo
Book Image

Hadoop Operations and Cluster Management Cookbook

By: Shumin Guo

Overview of this book

<p>We are facing an avalanche of data. The unstructured data we gather can contain many insights that could hold the key to business success or failure. Harnessing the ability to analyze and process this data with Hadoop is one of the most highly sought after skills in today's job market. Hadoop, by combining the computing and storage powers of a large number of commodity machines, solves this problem in an elegant way!</p> <p>Hadoop Operations and Cluster Management Cookbook is a practical and hands-on guide for designing and managing a Hadoop cluster. It will help you understand how Hadoop works and guide you through cluster management tasks.</p> <p>This book explains real-world, big data problems and the features of Hadoop that enables it to handle such problems. It breaks down the mystery of a Hadoop cluster and will guide you through a number of clear, practical recipes that will help you to manage a Hadoop cluster.</p> <p>We will start by installing and configuring a Hadoop cluster, while explaining hardware selection and networking considerations. We will also cover the topic of securing a Hadoop cluster with Kerberos, configuring cluster high availability and monitoring a cluster. And if you want to know how to build a Hadoop cluster on the Amazon EC2 cloud, then this is a book for you.</p>
Table of Contents (15 chapters)
Hadoop Operations and Cluster Management Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Importing data to HDFS


If our Big Data is on the local filesystem, we need to move it to HDFS. In this section, we will list steps to move data from the local filesystem to the HDFS filesystem.

Getting ready

We assume that our Hadoop cluster has been properly configured and all the Hadoop daemons are running without any issues. And we assume that the data on the local system is in the directory /data.

How to do it...

Perform the following steps to import data to HDFS:

  1. Use the following command to create a data directory on HDFS:

    hadoop fs -mkdir data
    

    This command will create a directory /user/hduser/data in the HDFS filesystem.

  2. Copy the data file from the local directory to HDFS using the following command:

    hadoop fs -cp file:///data/datafile /user/hduser/data
    

    Alternatively, we can use the command hadoop fs -put /data/datafile /user/hduser/data.

  3. Verify the data file on HDFS with the following command:

    hadoop fs -ls /user/hduser/data
    
  4. Move the data file from the local directory to HDFS with the following...