@Habtamu Wubneh Can you check your Java environment $ which -a java Are you executing the java command as a non-root user? /var/log/hadoop/hdfs/jsvc.out’ for reading: Permission denied What are the permissions and ownership? Modify the JAVA_HOME value in the hadoop-env.sh file: export JAVA_HOME=/usr/java/default Start the data node su -l hdfs -c "/usr/hdp/current/hadoop-hdfs-datanode/../hadoop/sbin/hadoop-daemon.sh start datanode" HTH ... View more