Apache Hadoop 3.3.1 Installation Steps on Ubuntu (Part 2)

Use the following property in the respective files

File: nano etc/hadoop/core-site.xml:


<configuration>


  <property>


   
<name>fs.defaultFS</name>


   
<value>hdfs://localhost:9000</value>


  </property>    

</configuration>

File: nano etc/hadoop/hdfs-site.xml


<configuration>


  <property>


   
<name>dfs.replication</name>


   
<value>1</value>


  </property>    

</configuration>

File: nano etc/hadoop/mapred-site.xml


<configuration>


  <property>


   
<name>mapreduce.framework.name</name>


   
<value>yarn</value>


  </property>    
  <property>


   
<name>mapreduce.application.classpath</name>


   
<value> $HADOOP_MAPRED_HOME/share/hadoop/mapreduce/*:$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/lib/*</value>


  </property>    

</configuration>

File: nano etc/hadoop/yarn-site.xml


<configuration>


  <property>


   
<name>yarn.nodemanager.aux-services</name>


   
<value>mapreduce_shuffle</value>


  </property>    
  <property>


   
<name>yarn.nodemanager.env-whitelist</name>


   
<value> JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,CLASSPATH_PREPEND_DISTCACHE,

HADOOP_YARN_HOME,HADOOP_HOME,PATH,LANG,TZ,HADOOP_MAPRED_HOME*</value>


  </property>    

</configuration>

Now check that you can ssh to the localhost without a passphrase:

$ ssh localhost

If you cannot ssh to localhost without a passphrase, execute the following commands:

$ ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
$ chmod 0600 ~/.ssh/authorized_keys

Open the bashrc files in the nano editor using the following command:

nano .bashrc

edit .bashrc file located in the user’s home directory and add the following parameters:

export HADOOP_HOME="/home/bigdata/hadoop/hadoop-3.3.1”
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin
export HADOOP_MAPRED_HOME=${HADOOP_HOME}
export HADOOP_COMMON_HOME=${HADOOP_HOME}
export HADOOP_HDFS_HOME=${HADOOP_HOME}
export YARN_HOME=${HADOOP_HOME}