Single Node Cluster Setup

Single Node Cluster Setup
Step 1: Install Java 8 (Recommended Oracle Java) 

Hadoop requires a working Java 1.5+ installation. However, using Java 8 is recommended for running Hadoop.

1.1 Install Python Software Properties

Command

sudo apt-get install python-software-properties 

1.2 Add Repository

Command

sudo add-apt-repository ppa:webupd8team/java 

1.3 Update the source list

Command

sudo apt-get update 

1.4 Install Java 

Command

sudo apt-get install oracle-java8-installer 
Step 2: Configure SSH

Hadoop requires SSH access to manage its nodes, i.e. remote machines plus your local machine if you want to use Hadoop on it.

2.1 Install Open SSH Server-Client

Command

sudo apt-get install openssh-server openssh-client 

2.2 Generate KeyPairs

Command

ssh-keygen -t rsa -P "" 

2.3 Configure password-less SSH

Command

cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys 

2.4 Check by SSH to localhost

Command

ssh localhost 
Step 3: Install Hadoop

3.1 Download Hadoop

http://archive.cloudera.com/cdh5/cdh/5/hadoop-2.5.0-cdh5.3.2.tar.gz

Note

You can download any version of hadoop version 2+. Here I am using CDH version is Cloudera’s 100% open source platform distribution.

3.2 Untar Tar ball

Command

tar xvzf hadoop-2.5.0-cdh5.3.2.tar.gz 

Note

All the required jars, scripts, configuration files, etc. are available in HADOOP_HOME directory (hadoop-2.5.0-cdh5.3.2).

Step 4: Setup Configuration

4.1 Edit .bashrc

Edit .bashrc file located in user’s home directory and add following parameters.

Command

vi .bashrc
export HADOOP_PREFIX="/home/hdadmin/hadoop-2.5.0-cdh5.3.2"
export PATH=$PATH:$HADOOP_PREFIX/bin
export PATH=$PATH:$HADOOP_PREFIX/sbin
export HADOOP_MAPRED_HOME=${HADOOP_PREFIX}
export HADOOP_COMMON_HOME=${HADOOP_PREFIX}
export HADOOP_HDFS_HOME=${HADOOP_PREFIX}
export YARN_HOME=${HADOOP_PREFIX} 

Note

After above step restart the terminal, so that all the environment variables will come into effect or execute the source command.

Command

source .bashrc

4.2 Edit hadoop-env.sh 

hadoop-env.sh contains the environment variables that are used in the script to run Hadoop like Java home path, etc. Edit configuration file hadoop-env.sh (located in HADOOP_HOME/etc/hadoop) and set JAVA_HOME. 

Command

vi hadoop–env.sh 
export JAVA_HOME=/usr/lib/jvm/java-8-oracle/

Note

Here your can change java path according to your java installation directory.

4.3 Edit core-site.xml 

core-site.xml informs Hadoop daemon where NameNode runs in the cluster. It contains configuration settings of Hadoop core such as I/O settings that are common to HDFS & MapReduce.

Edit configuration file core-site.xml (located in HADOOP_HOME/etc/hadoop) and add following entries.

Command

vi core-site.xml  
<configuration>
   <property>
      <name>fs.defaultFS</name>
      <value>hdfs://localhost:9000</value>
   </property>
   <property>
      <name>hadoop.tmp.dir</name>
      <value>/home/hdadmin/hdata</value>
   </property>
</configuration> 

Note

/home/hdadmin/hdata is a sample location; please specify a location where you have Read Write privileges.

4.4 Edit hdfs-site.xml 

hdfs-site.xml contains configuration settings of HDFS daemons (i.e. NameNode, DataNode, Secondary NameNode). It also includes the replication factor and block size of HDFS.

Edit configuration file hdfs-site.xml (located in HADOOP_HOME/etc/hadoop) and add following entries

Command

vi hdfs-site.xml  
<configuration>
   <property>
      <name>dfs.replication</name>
      <value>1</value>
   </property>
</configuration> 

4.5 Edit mapred-site.xml 

mapred-site.xml contains configuration settings of MapReduce application like number of JVM that can run in parallel, the size of the mapper and the reducer process,  CPU cores available for a process, etc.

In some cases, mapred-site.xml file is not available. So, we have to create the mapred-site.xml file using mapred-site.xml template. Edit configuration file mapred-site.xml (located in HADOOP_HOME/ etc/hadoop) and add following entries

Command

vi mapred-site.xml
<configuration>
   <property>
      <name>mapreduce.framework.name</name>
      <value>yarn</value>
   </property>
</configuration> 

4.6 Edit yarn-site.xml 

yarn-site.xml contains configuration settings of ResourceManager and NodeManager like application memory management size, the operation needed on program & algorithm, etc.Edit configuration file mapred-site.xml (located in HADOOP_HOME/etc/hadoop) and add following entries

Command

vi yarn-site.xml  
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
   <property>
      <name>yarn.nodemanager.aux-services</name>
      <value>mapreduce_shuffle</value>
   </property>
   <property>
      <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
      <value>org.apache.hadoop.mapred.ShuffleHandler</value>
   </property>
</configuration> 
Step 5: Start the Cluster

5.1 Format the name node:

Command

bin/hdfs namenode -format  

Note

This activity should be done once when you install hadoop, else It will delete all your data from HDFS.

5.2 Start HDFS Services

Command

sbin/start-dfs.sh 

5.3 Start YARN Services

Command

sbin/start-yarn.sh 

5.4 Check whether services have been started

To check that all the Hadoop services are up and running, run the below command.

Command

jps
NameNode
DataNode
ResourceManager
NodeManager
Jps
SecondaryNameNode
Step 6. Stop The Cluster

6.1 Stop HDFS Services

Command

sbin/stop-dfs.sh 

6.2 Stop YARN Services

Command

sbin/stop-yarn.sh
Single Node Cluster Setup


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