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.
No new nodes can be added to the cluster until you specify them in the dfs.hosts file
B.
Any machine running the DataNode daemon can immediately join the cluster
C.
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
D.
Presented with a blank dfs.hosts property, the NameNode will permit DataNodes
specified in mapred.hosts to join the cluster
Explanation:
B
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B is the correct answer.
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B
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B is correct.
dfs.hosts = names a file that contains a list of hosts that are permitted to connect to the namenode. The full pathname of the file must be specified.
If the value is empty, all hosts are permitted.
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B
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