How to Quick-Start With Apache Hadoop on CentOS 7.x Linux

February 16, 2017 | By the+gnu+linux+evangelist.

Hadoop 2.X Quick Start on CentOS 7.x Linux

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 CentOS 7.x Linux Desktop/Server.

Hadoop is a distributed master-slave that consists of the Hadoop Distributed File System (HDFS) for storage and Map-Reduce for computational capabilities.

The Hadoop Distributed File System (HDFS) is a distributed file system that spreads data blocks across the storage defined for the Hadoop cluster.

The foundation of Hadoop is the two core frameworks YARN and HDFS. These two frameworks deal with Processing and Storage.

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 CentOS 6 Linux are Expressly Essentials to Give Focus Only to the Essentials Instructions and Commands.

Install Hadoop for CentOS 6 Linux - Featured
  1. Download Latest Apache Hadoop Stable Release:

    Apache Hadoop Binary tar.gz
  2. Double-Click on Archive and Extract Into /tmp Directory.

    Linux CentOS Apache Hadoop Stable Quick Start - Extracting tar.gz Archive

    Or from CLI:

    tar xvzf *hadoop*tar.gz -C /tmp
  3. Open a Shell Terminal emulator window
    (Press “Enter” to Execute Commands)

    Linux CentOS Apache Hadoop Stable Quick Start - Open Terminal

    Or Login into the Server Shell.

  4. 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
  5. 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*
  6. How to Install Required Java JDK 8+ on CentOS Linux

    Install Oracle JDK 8+ for CentOS
  7. 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 :)

  8. Eclipse Hadoop Integration with Free Plugin.

    Hadoop Eclipse Plugin SetUp
  9. 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>
    
  10. 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
  11. 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
  12. Formatting HDFS

    hdfs namenode -format

    Install Hadoop for CentOS 6.x - Terminal Apache Hadoop HDFS Formatting Success

  13. Starting Up Hadoop Database

    start-all.sh
  14. Apache Hadoop Database Quick Start Guide


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