Hadoop

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Hadoop is a Java-based programming framework that supports the processing and storage of extremely large datasets on a cluster of inexpensive machines. It was the first major open source project in the big data playing field and is sponsored by the Apache Software Foundation. Hadoop is comprised of four main layers:

  1. Hadoop Common is the collection of utilities and libraries that support other Hadoop modules.
  2. HDFS, which stands for Hadoop Distributed File System, is responsible for persisting data to disk.
  3. YARN, short for Yet Another Resource Negotiator, is the "operating system" for HDFS.
  4. MapReduce is the original processing model for Hadoop clusters. It distributes work within the cluster or map, then organizes and reduces the results from the nodes into a response to a query. Many other processing models are available for the 3.x version of Hadoop

Configuration

mkdir -p /home/hadoop/hdfs/{datanode,namenode}/
sudo tee -a $HADOOP_HOME/etc/hadoop/core-site.xml >/dev/null <<EOF
<configuration>
    <property>
        <name>hadoop.tmp.dir</name>
        <value>/home/hadoop/tmp</value>
    </property>
    <property>
        <name>fs.default.name</name>
        <value>hdfs://0.0.0.0:9000</value>
        <description>The default file system URI</description>
    </property>
</configuration>
EOF

mkdir -p /home/hadoop/hdfs/{datanode,namenode}
sudo tee -a $HADOOP_HOME/etc/hadoop/hdfs-site.xml >/dev/null <<EOF
<configuration>
    <property>
      <name>dfs.replication</name>
      <value>1</value>
    </property>
    <property>
      <name>dfs.namenode.name.dir</name>
      <value>/home/hadoop/hdfs/namenode/</value>
    </property>
    <property>
      <name>dfs.datanode.data.dir</name>
      <value>/home/hadoop/hdfs/datanode/</value>
    </property>
</configuration>
EOF

sudo tee -a $HADOOP_HOME/etc/hadoop/mapred-site.xml >/dev/null <<EOF
<configuration>
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
</configuration>
EOF

sudo tee -a $HADOOP_HOME/etc/hadoop/yarn-site.xml >/dev/null <<EOF
<configuration>
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>
</configuration>
EOF

Unit Testing

lxc launch images:debian/12 agronomy &&
lxc exec agronomy bash <<'EOF'
sleep 5
apt-get install -y curl wget openjdk-11-jre\
 openssh-client openssh-server
systemctl daemon-reload
systemctl restart sshd
systemctl status sshd
java -version
EOF

lxc launch images:fedora/37 robotics &&
lxc exec robotics bash <<'EOF'
sleep 5
dnf install -y curl wget java-11-openjdk\
 openssh-client openssh-server
systemctl daemon-reload
systemctl restart sshd
systemctl status sshd
java -version
EOF

lxc launch images:ubuntu/22.04 software &&
lxc exec software bash <<'EOF'
sleep 5
apt-get install -y curl wget openjdk-11-jre\
 openssh-client openssh-server
systemctl daemon-reload
systemctl restart sshd
systemctl status sshd
java -version
EOF

create alias:
lxc stop     agronomy
lxc publish  agronomy --alias\
 debian/12:java:ssh

create alias from snapshot:
lxc snapshot agronomy java:ssh
lxc publish  agronomy/java:ssh --alias\
 debian/12:java:ssh
lxc delete   agronomy

launch alias:
lxc launch   debian/12:java:ssh agronomy &&
lxc exec     agronomy bash
lxc stop     agronomy && lxc delete agronomy

create alias:
lxc stop     robotics
lxc publish  robotics --alias\
 fedora/37:java:ssh

create alias from snapshot:
lxc snapshot robotics java:ssh
lxc publish  robotics/java:ssh --alias\
 fedora/37:java:ssh
lxc delete   robotics

launch alias:
lxc launch   fedora/37:java:ssh robotics &&
lxc exec     robotics bash
lxc stop     robotics && lxc delete robotics

create alias:
lxc stop     software
lxc publish  software --alias\
 ubuntu/22.04:java:ssh

create alias from snapshot:
lxc snapshot software java:ssh
lxc publish  software/java:ssh --alias\
 ubuntu/22.04:java:ssh
lxc delete   software

launch alias:
lxc launch   ubuntu/22.04:java:ssh software &&
lxc exec     software bash
lxc stop     software && lxc delete software

Knowledge

ssh-keygen -b 4096 -t rsa -f ~/.ssh/id_rsa -q -N "hadoop@${HOSTNAME}"
readlink -f /usr/bin/java | sed "s:bin/java::"
sudo apt-get install pdsh
sudo apt-get install ssh

su -h hadoop
hdfs namenode -format
sudo -u haddop -H sh -c "whoami; echo ${HOME}"

sh $HADOOP_HOME/sbin/start-dfs.sh
http://127.0.0.1:9870

sh $HADOOP_HOME/sbin/start-yarn.sh
http://127.0.0.1:8088

sudo apt dist-upgrade
sudo do-release-upgrade

sudo apt --fix-broken install
sudo apt install ubuntu-desktop

[Service]
User=hadoop
Group=hadoop
Type=forking
SuccessExitStatus=143

if [ -f '/etc/os-release' ];then
         HOST_OS_ID=$(grep -oP '(?<=^ID=).+'         /etc/os-release | tr -d '"')
    HOST_OS_ID_LIKE=$(grep -oP '(?<=^ID_LIKE=).+'    /etc/os-release | tr -d '"')
    HOST_OS_VERSION=$(grep -oP '(?<=^VERSION_ID=).+' /etc/os-release | tr -d '"')
fi

declare -a HADOOP_SCHEDULERS=(dev prod);\
declare -A MINMAX_CAPACITIES=([dev]='50 50' [prod]='50 70');\
for HADOOP_SCHEDULER in ${HADOOP_SCHEDULERS[@]};do \
    for MINMAX_CAPACITY in ${MINMAX_CAPACITIES[${HADOOP_SCHEDULER}]};do \
        echo "${HADOOP_SCHEDULER} => ${MINMAX_CAPACITY}";\
    done;\
done

References

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