Cloudera CCAH CCA-470 Practice Tests

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Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?
A.NameNode
B.DataNode
C.JobTracker
D.TaskTracker
E.ResourceManager
F.ApplicationMaster
G.NodeManager
Answer: D
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 DataNode daemons to apply the changes to the cluster.
C.You don't need to restart any daemon, as they will pick up changes automatically.
D.You must modify the configuration files on each of the six DataNode machines.
E.You must modify the configuration files on only one of the DataNode machine
F.You must modify the configuration files on the NameNode only.DataNodes read their configuration from the master nodes.
Answer: A, F

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