Book Image

Hadoop 2.x Administration Cookbook

By : Aman Singh
Book Image

Hadoop 2.x Administration Cookbook

By: Aman Singh

Overview of this book

Hadoop enables the distributed storage and processing of large datasets across clusters of computers. Learning how to administer Hadoop is crucial to exploit its unique features. With this book, you will be able to overcome common problems encountered in Hadoop administration. The book begins with laying the foundation by showing you the steps needed to set up a Hadoop cluster and its various nodes. You will get a better understanding of how to maintain Hadoop cluster, especially on the HDFS layer and using YARN and MapReduce. Further on, you will explore durability and high availability of a Hadoop cluster. You’ll get a better understanding of the schedulers in Hadoop and how to configure and use them for your tasks. You will also get hands-on experience with the backup and recovery options and the performance tuning aspects of Hadoop. Finally, you will get a better understanding of troubleshooting, diagnostics, and best practices in Hadoop administration. By the end of this book, you will have a proper understanding of working with Hadoop clusters and will also be able to secure, encrypt it, and configure auditing for your Hadoop clusters.
Table of Contents (20 chapters)
Hadoop 2.x Administration Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Index

HBase backup and restore


In this recipe, we will look at HBase backup and restore. We have discussed in the Namenode high availability section about the importance of backup, despite having HA. We will look at ways to take snapshots and restore it.

Getting ready

For this recipe, you must have completed the Setting up multi-node Hbase cluster recipe and have a basic understanding of the backup principles.

How to do it...

  1. Connect to the master1.cyrus.com HBase master node and switch to the user hadoop.

  2. Execute the following command to take a snapshot of a particular table. In this case, the table name is test:

    $ hbase snapshot create -n test_30march -t test
    
  3. To list the snapshots, connect the HBase shell as shown in the following screenshot:

  4. We can restore the snapshot using the following command—the table must be disabled for the restore:

      hbase> disable 'test_30march'
      hbase> restore_snapshot 'test_30march'
    
  5. To clone the table, we can restore it to a new table. This is good way of testing...