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  • Book Overview & Buying Cloudera Administration Handbook
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Cloudera Administration Handbook

Cloudera Administration Handbook

By : Rohit Menon
3.5 (10)
Buy this Book
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Cloudera Administration Handbook

Cloudera Administration Handbook

3.5 (10)
By: Rohit Menon
Buy this Book

Overview of this book

An easy-to-follow Apache Hadoop administrator’s guide filled with practical screenshots and explanations for each step and configuration. This book is great for administrators interested in setting up and managing a large Hadoop cluster. If you are an administrator, or want to be an administrator, and you are ready to build and maintain a production-level cluster running CDH5, then this book is for you.
Table of Contents (11 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Started with Apache Hadoop
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1. Getting Started with Apache Hadoop
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History of Apache Hadoop and its trends
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Components of Apache Hadoop
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Understanding the Apache Hadoop daemons
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Introducing Cloudera
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Introducing CDH
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Responsibilities of a Hadoop administrator
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Summary
2
2. HDFS and MapReduce
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2. HDFS and MapReduce
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Essentials of HDFS
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The read/write operational flow in HDFS
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Understanding the namenode UI
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Understanding the secondary namenode UI
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Exploring HDFS commands
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Getting acquainted with MapReduce
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Summary
3
3. Cloudera's Distribution Including Apache Hadoop
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3. Cloudera's Distribution Including Apache Hadoop
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Getting started with CDH
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Understanding the CDH components
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Installing CDH
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Installing the CDH components
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Summary
4
4. Exploring HDFS Federation and Its High Availability
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4. Exploring HDFS Federation and Its High Availability
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Implementing HDFS Federation
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Implementing HDFS High Availability
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Jobtracker high availability
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Summary
5
5. Using Cloudera Manager
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5. Using Cloudera Manager
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Introducing Cloudera Manager
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Understanding the Cloudera Manager architecture
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Installing Cloudera Manager
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Navigating the Cloudera Manager Web console
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Configuring High Availability using Cloudera Manager
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Summary
6
6. Implementing Security Using Kerberos
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6. Implementing Security Using Kerberos
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Understanding authentication and authorization
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Introducing Kerberos
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Understanding the Kerberos Architecture
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Installing Kerberos
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Configuring Kerberos for Apache Hadoop
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Authorization in Apache Hadoop
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Summary
7
7. Managing an Apache Hadoop Cluster
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7. Managing an Apache Hadoop Cluster
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Configuring Hadoop services using Cloudera Manager
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Role management in Cloudera Manager
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Managing hosts using Cloudera Manager
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Managing multiple clusters with Cloudera Manager
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Rebalancing a Hadoop cluster from Cloudera Manager
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Summary
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8. Cluster Monitoring Using Events and Alerts
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8. Cluster Monitoring Using Events and Alerts
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Monitoring Hadoop services from Cloudera Manager
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Understanding events and alerts
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Summary
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9. Configuring Backups
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9. Configuring Backups
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Understanding backups
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Understanding HDFS backups
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Using the distributed copy (DistCp)
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Configuring backups using Cloudera Manager
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Summary
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Index
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Index

Rebalancing a Hadoop cluster from Cloudera Manager

The Balancer tool available in Hadoop is used to balance the data blocks across all the datanodes when a new datanode is added or when an existing datanode reaches full capacity.

Adding the Balancer service to the cluster

Before you can rebalance a cluster, we need to add the balancer service. The following are the steps to add the Balancer service:

  1. Navigate to the Clusters menu and select HDFS.

  2. Click on the Instances tab and select Add to bring up the Customize Role Assignments screen as shown in the following screenshot:

  3. Click on Select a host for the Balancer section to bring up the host selection screen as shown in the following screenshot. Select a host and click on OK. Here I have selected node4.

  4. In the next screen, click on Continue. You should now see the Balancer service added, as shown in the following screenshot:

Rebalancing the cluster

Once the Balancer service is installed successfully, you can perform the rebalancing operation. The...

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