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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. On a cluster running MapReduce v1 (MRv1), the value of the mapred.tasktracker.map.tasks.maximum configuration parameter in the mapred-site.xml file should be set to:

A) Half the number of the maximum number of Reduce tasks which can run on the cluster as a whole.
B) The maximum number of Map tasks which can run on the cluster as a whole.
C) The same value on each slave node.
D) Half the number of the maximum number of Reduce tasks which can run simultaneously on an individual node.
E) The maximum number of Map tasks can run simultaneously on an individual node.

2. Which two features does Kerberos security add to a Hadoop cluster?

A) Encryption for data on disk ("at rest")
B) User authentication on all remote procedure calls (RPcs)
C) Encryption on all remote procedure calls (RPCs)
D) Authentication for user access to the cluster against a central server
E) Root access to the cluster for users hdfs and mapred but non-root acess clients

3. What do you need to do when adding new slave nodes to a cluster?

A) Add a new entry to /etc/slavenodes on the NameNode host.
B) Halt and resubmit any running MapReduce jobs to guarantee correctness.
C) add the new node's DNS name to the conf/slaves file on the master node.
D) Restart the NameNode daemon.
E) Increase the value of dfs.number.of.nodes in hdfs-site.xml.

4. Identify which two daemons typically run each slave node in a Hadoop cluster running MapReduce v1 (MRv1)

A) NameNode
B) TaskTracker
C) JobTracker
D) Secondary NameNode
E) DataNode
F) NodeManager

5. How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)

A) DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.
B) The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.
C) The NameNode send a broadcast across the network when it first starts, and DataNodes respond.
D) DataNodes heartbeat in the master on a regular basis.

Solutions: