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.
Presented with a blank dfs.hosts property, the NameNode will permit DatNode specified in
mapred.hosts to join the cluster
C.
Any machine running the DataNode daemon can immediately join the cluster
D.
The NameNode will update the dfs.hosts property to include machine running DataNode
daemon on the next NameNode reboot or with the command dfsadmin -refreshNodes
i think the answer should be C …. since there is no dfs.hosts property, there wont be any file …. and any node can join the cluster if that is having hdfs site path.
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I agree with Bhavan
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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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Correct answer is D
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