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

Configuring Hadoop audit logging


Audit logging might be required for data processing systems such as Hadoop. In Hadoop, audit logging has been implemented using the Log4j Java logging library at the INFO logging level. By default, Hadoop audit logging is disabled. This recipe will guide you through the steps to configure Hadoop audit logging.

Getting ready

We assume that our Hadoop cluster has been configured properly.

Log in to the master node from the administrator machine using the following command:

ssh hduser@master

How to do it...

Perform the following steps to configure Hadoop audit logging:

  1. Enable audit logging by changing the following line in the $HADOOP_HOME/conf/log4j.properties file from:

    log4j.logger.org.apache.hadoop.hdfs.server.namenode.FSNamesystem.audit=WARN
    

    to the following:

    log4j.logger.org.apache.hadoop.hdfs.server.namenode.FSNamesystem.audit=INFO
    
  2. Try making a directory on HDFS with the following command:

    hadoop fs -mkdir audittest
    
  3. Check the audit log messages in the NameNode...