Install Hadoop 2.X for Oracle Linux 6.X
Hi! The Tutorial shows you Step-by-Step How to Install and Getting-Started with Apache Hadoop/Map-Reduce vanilla in Pseudo-Distributed mode on Oracle Linux 6.x 32/64-bit KDE/GNOME Desktop.
Hadoop is a distributed master-slave that consists of the Hadoop Distributed File System (HDFS) for storage and Map-Reduce for computational capabilities.
The Guide Describe a System-Wide Setup with Root Privileges but you Can Easily Convert the Procedure to a Local One.
The Contents and Details of How to Install Hadoop on Oracle Linux 6.X are Expressly Essentials to Give Focus Only to the Essentials Instructions and Commands.
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Download Latest Apache Hadoop Stable Release:
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Double-Click on Archive and Extract Into /tmp Directory.
Or from CLI:
tar xvzf *hadoop*tar.gz -C /tmp
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Open a Shell Terminal emulator window
(Press “Enter” to Execute Commands)
In case first see: Terminal QuickStart Guide.
Or Login into Server Shell. -
Relocate Apache Hadoop Directory
Get SuperUser Privileges:sudo su
If Got “User is Not in Sudoers file” then see: How to Enable sudo
Then Switch the contents with:mv /tmp/hadoop* /usr/local/
Make an hadoop symlink directory:
ln -s /usr/local/hadoop* /usr/local/hadoop
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Make Hadoop Needed Directories:
First, Make the Logs Dir:
mkdir /usr/local/hadoop/logs
Giving Writing Permissions:
chmod 777 /usr/local/hadoop/logs
Next Make the Cache Dir:
mkdir /usr/local/hadoop/cache
Same Writing Permissions as for Logs:
chmod 777 /usr/local/hadoop/cache
And then also the Temporary Dir:
mkdir /usr/local/hadoop/tmp
Set the root as Owner:
sudo chown -R root:root /usr/local/hadoop*
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How to Install Required Java JDK 8+ on Oracle Linux
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Set JAVA_HOME in Hadoop Env File
Make the Conf directory:mkdir /usr/local/hadoop/conf
Make an Env file:
nano /usr/local/hadoop/conf/hadoop-env.sh
Append:
export JAVA_HOME=/usr/lib/jvm/[oracleJdkVersion]
Change [oracleJdkVersion] with the current Version:
Ctrl+x to Save & Exit from nano Editor :) -
Hadoop Configuration for Pseudo-Distributed mode
nano /usr/local/hadoop/conf/core-site.xml
Append:
<?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href="configuration.xsl"?> <configuration> <property> <name>hadoop.tmp.dir</name> <value>/usr/local/hadoop/tmp</value> </property> <property> <name>fs.default.name</name> <value>hdfs://localhost:8020</value> </property> </configuration>
Next:
nano /usr/local/hadoop/conf/hdfs-site.xml
Append:
<?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href="configuration.xsl"?> <configuration> <property> <name>dfs.replication</name> <value>1</value> </property> <property> <!-- specify this so that running 'hdfs namenode -format' formats the right dir --> <name>dfs.name.dir</name> <value>/usr/local/hadoop/cache/hadoop/dfs/name</value> </property> </configuration>
Last:
nano /usr/local/hadoop/conf/mapred-site.xml
Append:
<?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href="configuration.xsl"?> <configuration> <property> <name>mapred.job.tracker</name> <value>localhost:8021</value> </property> </configuration>
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SetUp Local Path & Environment
Exit from SuperUser to the normal User:exit
Change to the Home directory:
cd
Edit the bash Config file:
nano .bashrc
Inserts:
HADOOP_HOME=/usr/local/hadoop/nexport PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin/nexport JAVA_HOME=/usr/lib/jvm/<oracleJdkVersion>
Then Load the New Setup:
source $HOME/.bashrc
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SetUp Needed Local SSH Connection
sudo systemctl start ssh
Generate SSH Keys to Access:
ssh-keygen -b 2048 -t rsa
echo "$(cat ~/.ssh/id_rsa.pub)" > ~/.ssh/authorized_keys
Testing Connection:
ssh 127.0.0.1
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Formatting HDFS
hdfs namenode -format
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Starting Up Hadoop Database
start-all.sh
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Apache Hadoop Database Quick Start Guide
Hadoop MapReduce Quick Start
Eclipse Hadoop Integration with Free Plugin.
