Preparing the Hadoop cluster

Perform the following tasks to prepare the Hadoop cluster for NetBackup:

Ensure that the Hadoop directory is snapshot-enabled.
To make a directory snapshottable, run the following command on the NameNodes:
hdfs dfsadmin -allowSnapshot directory_name
Note:
A directory cannot be snapshot-enabled if one of its ancestors or descendants is a snapshot-enabled directory.
For more information, refer to the Hadoop documentation.
Update firewall settings (ensure that the correct port is added along with the Hadoop credentials) so that the backup hosts can communicate with the Hadoop cluster.
Add the entries of all the NameNodes and DataNodes to the /etc/hosts file on all the backup hosts. You must add the hostname in FQDN format.
Or
Add the appropriate DNS entries in the /etc/resolv.conf file.
Ensure that webhdfs service is enabled on the Hadoop cluster.