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Cloudera CCA-470 Exam Syllabus Topics:

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

1. Your cluster is running Map v1 (MRv1), with default replication set to 3, and a cluster blocks 64MB. Identify which best describes the file read process when a Client application connects into the cluster and requests a 50MB file?

A) The client queries the NameNode for the locations of the block, and reads all three copies. The first copy to complete transfer to the client is the one the client reads as part of Hadoop's execution framework.
B) The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.
C) The client queries the NameNode and then retrieves the block from the nearest DataNode to the client and then passes that block back to the client.
D) The client queries the NameNode for the locations of the block, and reads from a random location in the list it receives to eliminate network I/O loads by balancing which nodes it retrieves data from at any given time.

2. Which three processes does HDFS High Availability (HA) enable on your cluster?

A) Write data to two clusterssimultaneously
B) Automatically 'fail over' between NameNodes if one goes down
C) Manually 'fail over' between NameNodes
D) Shut one NameNode down for maintenance without halting the cluster
E) Configure unlimited hot standby NameNode.

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

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

4. For a MapReduce job, what's the relationship between tasks and task attempts?

A) There are always at least as many task attempts as there are tasks.
B) There are always at most as many task attempts as there are tasks.
C) There are always exactly as many task attempts as there are tasks.

5. What's the relationship between JobTrackers and TaskTrackers?

A) Every node in the cluster runs both a JobTracker and a TaskTracker. The JobTrackers manage jobs, and the TaskTrackers are responsible for managing actual map and reduce tasks.
B) The JobTracker runs on a single master node and accepts MapReduce jobs from clients. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.
C) The JobTracker runs on a single master node, but forks a separate instance of itself for every client MapReduce job. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.
D) The TaskTrackers runs on a single master node and accepts MapReduce jobs from clients. A JobTracker runs on every slave node and is responsible for managing map and reduce tasks.

Solutions: