I've founded we have some items already set within hdfs-site.xml with different names that the ones indicated on hwx documents. Therefore:
1.- I would like to know the difference between each item.
2.- To know if it will be better to add them within the hdfs-site.xml along the existing settings already there?. I meant duplicate the values but with different names setings.
3.- To remove current setting and set the new ones (the ones indicated on the document).
For question 3 I would say this will depend on my organization requierements but I would like to read your ideas.
Current = nfs.kerberos.principal
Reccommended = dfs.nfsgateway.kerberos.principal
Current = nfs.keytab.file
Recommended = dfs.nfsgateway.keytab.file