Your Hadoop cluster contains nodes in three racks. You have not configured the dfs.hosts
property in the NameNode’s configuration file. What results?
A.
The NameNode will update the dfs.hosts property to include machines running the DataNode
daemon on the next NameNode reboot or with the command dfsadmin –refreshNodes
B.
No new nodes can be added to the cluster until you specify them in the dfs.hosts file
C.
Any machine running the DataNode daemon can immediately join the cluster
D.
Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in
mapred.hosts to join the cluster