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which scenario results if you leave the dfs.hosts property in the NameNode’s configuration file empty (blank

Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the
dfs.hosts property in the NameNode’s configuration file empty (blank)?

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A.
The NameNode will update dfs.hosts property to include machines running the DataNode
daemon on the next NameNode reboot or with a dfsadmin –refreshNodes.

B.
Any machine running the DataNode daemon can immediately join the cluster.

C.
Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in
mapred.hosts to join the cluster.

D.
No new can be added to the cluster until you specify them in the dfs.hosts file.

Explanation:
Apache Hadoop , Module 7: Managing a Hadoop Cluster

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