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

1. Which of the following describe the functions of a scheduling algorithm? (Choose 4)

A) Allow multiple users to share clusters in a predictable, policy-guided manner.
B) Reduce job latencies in an environment with multiple jobs of different sizes.
C) Reduce the total amount of computation necessary to complete a job.
D) Allow short Jobs to complete even when large, long jobs (consuming a lot of resources) are running.
E) Support the implementation of service-level agreements for multiple cluster users.
F) Run jobs at periodic times of the day.

2. 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 modify the configuration files on each of the six DataNode machines.
B) You must restart the NameNode daemon 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 only one of the DataNode machine
E) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
F) You must restart all six DataNode daemons to apply the changes to the cluster.

3. Which of the following statements is the most accurate about the choice of operating systems to run on a Hadoop cluster?

A) Linux and Solaris/OpenSolaris are preferable to Windows. Solaris running on SPARC hardware is the preferred Hadoop slave node configuration.
B) Linux is preferable to Windows and Solaris/OpenSolaris, but the choice of Linux distribution is unimportant when planning a Hadoop cluster.
C) The choice of operating system isn't very important for a Hadoop cluster.
D) Linux is preferable to Windows and Solaris/OpenSolaris. Some Linux distributions are intended for cluster environments more than others.

4. Choose three reasons why should you run the HDFS balancer periodically?

A) To help HDFS deliver consistent performance under heavy loads.
B) To improve data locality for MapReduce tasks.
C) To ensure that all blocks in the cluster are 128MB in size.
D) To ensure that there is consistent disk utilization across the DataNodes.
E) To ensure that there is capacity in HDFS tor additional data.

5. 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 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.
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 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.
D) 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.

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