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

1. You are planning a Hadoop duster, and you expect to be receiving just under 1TB of data per week which will be stored on the cluster, using Hadoop's default replication. You decide that your slave nodes will be configured with 4 x 1TB disks.
Calculate how many slave nodes you need to deploy at a minimum to store one year's worth of data.

A) 100 slave nodes
B) 100 slave nodes
C) 10 slave nodes
D) 50 slave nodes

2. 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 and then retrieves the block from the nearest DataNode to the client and then passes that block back to the client.
C) The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.
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.

3. When setting the HDFS block size, which of the following considerations is the least important?

A) Size of "typical" files that will be stored in HDFS.
B) Amount of memory on the NameNode.
C) Number of DataNodes.
D) Number of files that will be stored in HDFS.
E) Disk capacity of the NameNode.

4. Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02

A) nn02 becomes the standby NameNode and nn02 becomes the active NameNode
B) Nn01 becomes the standby NameNode and nn02 becomes the active NameNode
C) Nn01 is fenced, and nn01 becomes the active NameNode
D) Nn01 is fenced, and nn02 becomes the active NameNode

5. Where does a MapReduce job store the intermediate data output from Mappers?

A) In HDFS, in the job's output directory.
B) In HDFS, in temporary directory defined mapred.tmp.dir.
C) Stores on the underlying filesystem of the local disk of the machine on which the Reducer.
D) On the underlying filesystem of the local disk machine on which the JobTracker ran.
E) On the underlying filesystem of the local disk of the machine on which the Mapper ran.

Solutions: