In this tutorial, we will learn how to setup an Apache Hadoop on a single node cluster in an Alibaba Cloud Elastic Compute Service (ECS) instance with Ubuntu 16.04.
Before starting, you will need to download the latest version of the Hadoop from their official website. You can download it with the following command:
wget http://www-eu.apache.org/dist/hadoop/common/hadoop-3.1.0/hadoop-3.1.0.tar.gzOnce the download is completed, extract the downloaded file with the following command:
tar -xvzf hadoop-3.1.0.tar.gzNext, move the extracted directory to the /opt with the following command:
mv hadoop-3.1.0 /opt/hadoopNext, change the ownership of the hadoop directory using the following command:
chown -R hadoop:hadoop /opt/hadoop/Next, you will need to set an environment variable for Hadoop. You can do this by editing .bashrc file:
First, log in to hadoop user:
su - hadoopNext, open .bashrc file:
nano .bashrcAdd the following lines at the end of the file:
export HADOOP_HOME=/opt/hadoop
export HADOOP_INSTALL=$HADOOP_HOME
export HADOOP_MAPRED_HOME=$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 PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/binSave and close the file, when you are finished. Then, initialize the environment variables using the following command:
source .bashrcNext, you will also need to setup Java environment variable for Hadoop. You can do this by editing hadoop-env.sh file:
First, find the default Java path using the following command:
readlink -f /usr/bin/java | sed "s:bin/java::"Output:
/usr/lib/jvm/java-8-openjdk-amd64/jre/Now, open hadoop-env.sh file and paste above output in the hadoop-env.sh file:
nano /opt/hadoop/etc/hadoop/hadoop-env.shMake the following changes:
#export JAVA_HOME=${JAVA_HOME}
export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64/jre/Save and close the file, when you are finished.
Next, you will need to configure multiple configuration files to setup Hadoop infrastructure. First, log in with hadoop user and create a directory for hadoop file system storage:
mkdir -p /opt/hadoop/hadoopdata/hdfs/namenode
mkdir -p /opt/hadoop/hadoopdata/hdfs/datanodeFirst, you will need to edit core-site.xml file. This file contains the Hadoop port number information, file system allocated memory, data store memory limit and the size of Read/Write buffers.
nano /opt/hadoop/etc/hadoop/core-site.xmlMake the following changes:
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>Save the file, then open the hdfs-site.xml file. This file contains the replication data value, namenode path and datanode path for local file systems.
nano /opt/hadoop/etc/hadoop/hdfs-site.xmlMake the following changes:
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.name.dir</name>
<value>file:///opt/hadoop/hadoopdata/hdfs/namenode</value>
</property>
<property>
<name>dfs.data.dir</name>
<value>file:///opt/hadoop/hadoopdata/hdfs/datanode</value>
</property>
</configuration>Save the file, then open the mapred-site.xml file.
nano /opt/hadoop/etc/hadoop/mapred-site.xmlMake the following changes:
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>Save the file, then open the yarn-site.xml file:
nano /opt/hadoop/etc/hadoop/yarn-site.xmlMake the following changes:
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
</configuration>Save and close the file, when you are finished. If you would like to have more information, like how to install java to get started, access Hadoop services and test hadoop, please go to this tutorial.
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This course is designed to help users who want to understand Big Data technology, as well as data processing through cloud products. Through learning, users can fully understand the construction and basic use of Hadoop cluster, SSH protocol foundation, Hadoop directory structure, ECS security group configuration. It provides a reference for enterprises to build Hadoop cluster by themselves.
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Elastic and secure virtual cloud servers to cater all your cloud hosting needs.
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