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NO.1 What two processes must you do if you are running a Hadoop cluster with a single NameNode
and six DataNodes, and you want to change a configuration parameter so that it affects all six
DataNodes.
A. You must restart the NameNode daemon to apply the changes to the cluster
B. You must restart all six DatNode daemon to apply the changes to the cluster
C. You must modify the configuration files on each of the six SataNodes machines
D. You don't need to restart any daemon, as they will pick up changes automatically
E. You must modify the configuration files on the NameNode only. DataNodes read their
configuration from the master nodes
Answer: A,C

CCA-500 Syllabus   

NO.2 You have installed a cluster HDFS and MapReduce version 2 (MRv2) on YARN. You have no
dfs.hosts entry(ies) in your hdfs-site.xml configuration file.
You configure a new worker node by setting fs.default.name in its configuration files to point to the
NameNode on your cluster, and you start the DataNode daemon on that worker node.
What do you have to do on the cluster to allow the worker node to join, and start sorting HDFS
blocks?
A. Restart the NameNode
B. Nothing; the worker node will automatically join the cluster when NameNode daemon is started
C. Creating a dfs.hosts file on the NameNode, add the worker Node's name to it, then issue the
command hadoop dfsadmin -refresh Nodes = on the Namenode
D. Without creating a dfs.hosts file or making any entries, run the commands
hadoop.dfsadminrefreshModes on the NameNode
Answer: D

CCA-500 Reference