ssh-keygen
cat id_rsa.pub > authorized_keys
chmod 600 authorized_keys

nano /srv/hadoop/etc/hadoop/hadoop-env.sh

hadoop namenode -format
$HADOOP_HOME/sbin/start-dfs.sh
$HADOOP_HOME/sbin/start-yarn.sh

jps

hadoop fs -mkdir -p /home/hadoop
hadoop fs -copyFromLocal ./service.log /home/hadoop/service.log
hadoop jar /srv/hadoop/share/hadoop/tools/lib/hadoop-streaming*.jar \
-mapper /home/nabeel/hadoop/mapper.py -reducer /home/nabeel/hadoop/reducer.py \
-input /home/hadoop/service.log -output /home/hadoop/tag_count_1