The platform uses Hadoop HDFS as a file system for Spark. For web-ui access to it use the hadoop-name node address defined in the inventory file which is listening on port 50070.
For setting up Hadoop on a cluster of machines, the master should be able to do a password-less ssh to start the daemons on all the slaves. Hence, the user should generate a ssh-key with the name hadoop_id_rsa and the key should be stored under the directory files located at the root directory.
cd files/
ssh-keygen -t rsa -f hadoop_id_rsa