Hadoop Installation

Environment required for Hadoop: The production environment of Hadoop is UNIX, but it can also be used in Windows using Cygwin. Java 1.6 or above is needed to run Map Reduce Programs. For Hadoop installation from tar ball on the UNIX environment you need

Java Installation
SSH installation
Hadoop Installation and File Configuration

1) Java Installation

Step 1. Type “java -version” in prompt to find if the java is installed or not. If not then download java from http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html . The tar filejdk-7u71-linux-x64.tar.gz will be downloaded to your system.

Step 2. Extract the file using the below command

Step 3. To make java available for all the users of UNIX move the file to /usr/local and set the path. In the prompt switch to root user and then type the command below to move the jdk to /usr/lib.

Now in ~/.bashrc file add the following commands to set up the path.

Now, you can check the installation by typing “java -version” in the prompt.

2) SSH Installation

SSH is used to interact with the master and slaves computer without any prompt for password. First of all create a Hadoop user on the master and slave systems

To map the nodes open the hosts file present in /etc/ folder on all the machines and put the ip address along with their host name.

Enter the lines below

 190.12.1.114    hadoop-master 190.12.1.121    hadoop-salve-one 190.12.1.143   hadoop-slave-two 

Set up SSH key in every node so that they can communicate among themselves without password. Commands for the same are:

 # su hadoop  $ ssh-keygen -t rsa  $ ssh-copy-id -i ~/.ssh/id_rsa.pub tutorialspoint@hadoop-master  $ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop_tp1@hadoop-slave-1  $ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop_tp2@hadoop-slave-2  $ chmod 0600 ~/.ssh/authorized_keys  $ exit 

3) Hadoop Installation

Hadoop can be downloaded from http://developer.yahoo.com/hadoop/tutorial/module3.html

Now extract the Hadoop and copy it to a location.

Change the ownership of Hadoop folder

Change the Hadoop configuration files:

All the files are present in /usr/local/Hadoop/etc/hadoop

1) In hadoop-env.sh file add

2) In core-site.xml add following between configuration tabs,

3) In hdfs-site.xmladd following between configuration tabs,

  dfs.data.dir usr/hadoop/dfs/name/data true   dfs.name.dir usr/hadoop/dfs/name true   dfs.replication 1   

4) Open the Mapred-site.xml and make the change as shown below

5) Finally, update your $HOME/.bahsrc

 cd $HOME vi .bashrc Append following lines in the end and save and exit #Hadoop variables  export JAVA_HOME=/usr/lib/jvm/jdk/jdk1.7.0_71 export HADOOP_INSTALL=/usr/hadoop export PATH=$PATH:$HADOOP_INSTALL/bin  export PATH=$PATH:$HADOOP_INSTALL/sbin export HADOOP_MAPRED_HOME=$HADOOP_INSTALL  export HADOOP_COMMON_HOME=$HADOOP_INSTALL export HADOOP_HDFS_HOME=$HADOOP_INSTALL  export YARN_HOME=$HADOOP_INSTALL 

On the slave machine install Hadoop using the command below

 # su hadoop  $ cd /opt/hadoop  $ scp -r hadoop hadoop-slave-one:/usr/hadoop  $ scp -r hadoop hadoop-slave-two:/usr/Hadoop 

Configure master node and slave node

 $ vi etc/hadoop/masters hadoop-master  $ vi etc/hadoop/slaves hadoop-slave-one  hadoop-slave-two 

After this format the name node and start all the deamons

 # su hadoop  $ cd /usr/hadoop  $ bin/hadoop namenode -format  $ cd $HADOOP_HOME/sbin $ start-all.sh 

The easiest step is the usage of cloudera as it comes with all the stuffs pre-installed which can be downloaded from http://content.udacity-data.com/courses/ud617/Cloudera-Udacity-Training-VM-4.1.1.c.zip

Next TopicHDFS

Hadoop Installation

Hadoop Installation

1) Java Installation

2) SSH Installation

3) Hadoop Installation

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