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Assuming a cluster running HDFS, MapReduce version 2 (MRv2) on YARN with all settings at...

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Assuming a cluster running HDFS, MapReduce version 2 (MRv2) on YARN with all settings at their default, what do you need to do when adding a new slave node to cluster?

A.

Nothing, other than ensuring that the DNS (or/etc/hosts files on all machines) contains any entry for the new node.

B.

Restart the NameNode and ResourceManager daemons and resubmit any running jobs.

C.

Add a new entry to /etc/nodes on the NameNode host.

D.

Restart the NameNode of dfs.number.of.nodes in hdfs-site.xml

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