Install Hadoop on Windows: Part Three

Before reading this article, I highly recommend reading my previous article.

• Introduction of bigdata
• Install hadoop on windows
• Install hadoop on windows part 2

Step 1: After successful installation of Ubuntu log into Ubuntu with your credentials.



Step 2: After login we have to installan Ubuntu update if there is any. Write the following code.

Code: sudo apt-get install update



If you find “Unable to locate package update”, it means your operating system does not require any updates.

Step 3: Install jdk using the following code
sudo apt-get install default-jdk

Step 4: Le't's create a dedicated Hadoop group and Hadoop user called hduser
sudo addgroup hadoop



It returns an error thataHhadoop group already exists. We had created that group when we installed Ubuntu on VM. Now we add user.

sudo adduser --ingroup hadoop hduser



After entering password leave the default and say y.



Now let’s add hduser as administrator or sudo user.
sudo adduser hduser sudo



Now let’s install openssh server. Wikipedia says “OpenSSH, also known as OpenBSD Secure Shell,[a] is a suite of security-related network-level utilities based on the SSH protocol, which help to secure network communications via the encryption of network traffic over multiple authentication methods and by providing secure tunneling capabilities.”



Now let’s login with hduser and generate a key for hduser and add the key to the authorized keys.
su hduser



ssh-keygen –t rsa –P “”



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



Now let's try to login on localhost
ssh localhost



Don’t worry about all these messages. Now say logout for closing connection of localhost.

Now let’s install Hadoop. Download hadoop.





After download is completed you will find a message like “hadoop-2.7.1.tar.gz saved”. For me its like “hadoop-2.7.1.tar.gz.2 saved” because of my net connection. This download completed on third attempt.



tar xvzf hadoop-2.7.1.tar.gz



Don’t confuse with tar xvzf hadoop-2.7.1.tar.gz.2. My zip downloaded file name is
“hadoop-2.7.1.tar.gz.2” that’s why I have written hadoop-2.7.1.tar.gz.2.

Now let’s move Hadoop 2.7.1 to a directory /usr/local/hadoop.
sudo mv hadoop-2.7.1 /usr/local/hadoop



Let's give the directory to the hduser as the owner. After that edit the bashrc file and append to the end of the file the path of hadoop.

sudo chown –R hduser /user/local
sudo nano ~/.bashrc



export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64
export HADOOP_HOME=/usr/local/hadoop
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
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export HADOOP_OPTS=”-Djava.library.path”= $HADOOP_HOME/lib



After press ctr+”X”



Say yes.

source ~/.bashrc



Now let's give the Java path to run Hadoop.
sudo nano /usr/local/hadoop/etc/hadoop/hadoop-env.sh



After some scrolling we find export JAVA_HOME=$( JAVA_HOME)



Replace $(JAVA_HOME) to usr/lib/jvm/java-7-openjdk-amd64(your java location) and save.
Now let's configure the following xml file. Write following code in the configuration tag and save.

Core-site.xml

sudo nano /usr/local/hadoop/etc/hadoop/hadoop/core-site.xml

hdfs-site.xml

sudo nano /usr/local/hadoop/etc/hadoop/hadoop/hdfs-site.xml


yarn-site.xml

sudo nano /usr/local/hadoop/etc/hadoop/hadoop/yarn-site.xml


Let copy the mapred.xml template and then edit the file.

cp /usr/local/hadoop/etc/hadoop/mapred-site.xml.template /usr/local/hadoop/etc/hadoop/mapred-site.xml

After copying the file let's make the following changes.

mapred-site.xml

sudo nano /usr/local/hadoop/etc/hadoop/hadoop/mapred-site.xml



Now create a folder where Hadoop will process the hdfs jobs.

sudo mkdir –p /usr/local/hadoop_tmp
sudo mkdir –p /usr/local/hadoop_tmp/hdfs/namenode
sudo mkdir –p /usr/local/hadoop_tmp/hdfs/datanode





Now assign hduser the ownership of the folder. Run all the following commands.

sudo chown –R hduser /usr/local/hadoop_tmp
hdfs namenode –format
start –dfs.sh
start-yarn.sh
jsp

Now single node Hadoop cluster is installed. Now you can write the program.

Hope this article is helpful.