Kaushik Pal

About Kaushik Pal

Have 16 years of experience as a technical architect and software consultant in enterprise application and product development. Have interest in new technology and innovation area along with technical writing. His main focuses is on web architecture, web technologies, java/j2ee, Open source, big data and semantic technologies.

Hadoop setup on single node and multi node

We will describe Hadoop setup on single node and multi node. The Hadoop  environment setup and configuration will be described in details. First you need to download the following software (rpm).

  • Java JDK RPM
  • Apache Hadoop 0.20.204.0 RPM

A)  Single node system Hadoop setup

1) Install JDK on a Red Hat or CentOS 5+ system.
 

$ ./jdk-6u26-linux-x64-rpm.bin.sh

Java is installed and set JAVA_HOME to /usr/java/default

2) Install Apache Hadoop 0.20.204.

$ rpm -i hadoop-0.20.204.0-1.i386.rpm

3) Setup Apache Hadoop configuration and start Hadoop processes.

$ /usr/sbin/hadoop-setup-single-node.sh

The setup wizard will guide you through a list of questions to setup Hadoop. Hadoop should be running after answering ‘Y’ to all questions.

Create a user account on HDFS for yourself.

$ /usr/sbin/hadoop-create-user.sh -u $USER

B)  Multi-nodes Hadoop setup

1) Install both the JDK and Hadoop 0.20.204.0 RPMs on all nodes

2) Generate hadoop configuration on all nodes:

$ /usr/sbin/hadoop-setup-conf.sh \

  --namenode-url=hdfs://${namenode}:9000/ \

  --jobtracker-url=${jobtracker}:9001 \

  --conf-dir=/etc/hadoop \

  --hdfs-dir=/var/lib/hadoop/hdfs \

  --namenode-dir=/var/lib/hadoop/hdfs/namenode \

  --mapred-dir=/var/lib/hadoop/mapred \

  --datanode-dir=/var/lib/hadoop/hdfs/data \

  --log-dir=/var/log/hadoop \

  --auto

Where ${namenode} and ${jobtracker} should be replaced with hostname of namenode and jobtracker.

3) Format namenode and setup default HDFS layout.

$ /usr/sbin/hadoop-setup-hdfs.sh

4) Start all data nodes.

$ /etc/init.d/hadoop-datanode start

5) Start job tracker node.

$ /etc/init.d/hadoop-jobtracker start

6) Start task tracker nodes.

$ /etc/init.d/hadoop-tasktracker start

7) Create a user account on HDFS for yourself.

$ /usr/sbin/hadoop-create-user.sh -u $USER

C)  Setup Environment for Hadoop

$ vi ~/.bash_profile

In INSERT mode set path for JAVA_HOME

Export JAVA_HOME

Save file by clicking esc:wq

Run the .bash_profile

$ source ~/.bash_profile

Set JAVA_HOME path in Hadoop Environment file

$ /etc/hadoop/hadoop-env.sh

D)Configuration for Hadoop

Use the following:

conf/core-site.xml:

<configuration>
  <property>
    <name>fs.default.name</name>
    <value>hdfs://localhost:9000</value>
  </property>
</configuration>

conf/hdfs-site.xml:

<configuration>
  <property>
    <name>dfs.replication</name>
    <value>1</value>
  </property>
</configuration>

conf/mapred-site.xml:

<configuration>
  <property>
    <name>mapred.job.tracker</name>
    <value>localhost:9001</value>
  </property>
</configuration>

E) Hadoop Commands

$ hadoop
$ hadoop namenode –format (Format the namenode, If ask to
answer press ‘Y’)
$ hadoop namenode (Start the namenode)
$ find / -name start-dfs.sh (find the file in directory)
$ cd usr/sbin (Go to respective directory directly)
$ start-dfs.sh
$ start-mapred.sh

$ hadoop fs –ls / (Shows the HDFS root folder)
$ hadooop fs –put input/file01 /input/file01 (Copy local input/file01 to
HDFS root /input/file01)

 

Do you want to know how to develop your skillset to become a Java Rockstar?

Subscribe to our newsletter to start Rocking right now!

To get you started we give you two of our best selling eBooks for FREE!

JPA Mini Book

Learn how to leverage the power of JPA in order to create robust and flexible Java applications. With this Mini Book, you will get introduced to JPA and smoothly transition to more advanced concepts.

JVM Troubleshooting Guide

The Java virtual machine is really the foundation of any Java EE platform. Learn how to master it with this advanced guide!

Given email address is already subscribed, thank you!
Oops. Something went wrong. Please try again later.
Please provide a valid email address.
Thank you, your sign-up request was successful! Please check your e-mail inbox.
Please complete the CAPTCHA.
Please fill in the required fields.

Leave a Reply


+ six = 9



Java Code Geeks and all content copyright © 2010-2014, Exelixis Media Ltd | Terms of Use | Privacy Policy | Contact
All trademarks and registered trademarks appearing on Java Code Geeks are the property of their respective owners.
Java is a trademark or registered trademark of Oracle Corporation in the United States and other countries.
Java Code Geeks is not connected to Oracle Corporation and is not sponsored by Oracle Corporation.
Do you want to know how to develop your skillset and become a ...
Java Rockstar?

Subscribe to our newsletter to start Rocking right now!

To get you started we give you two of our best selling eBooks for FREE!

Get ready to Rock!
You can download the complementary eBooks using the links below:
Close