CCA-470 Exam Training Practice Tests (Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH))]

Question 1

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 capacity in HDFS tor additional data. E. To ensure that there is consistent disk utilization across the DataNodes.

Correct Answer: A,B,E

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Question 2

Your developers request that you enable them to use Hive on your Hadoop cluster. What do install and/or configure?

A. Install the Hive interpreter on the master node running the JobTracker, and configure a shared remote Hive Metastore. B. Install the Hive interpreter on the client machines and all nodes on the cluster C. Install the Hive interpreter on the client machines only, and configure a shared remote Hive Metastore. D. Install the Hive Interpreter on the client machines and all the slave nodes, and configure a shared remote Hive Metastore.

Correct Answer: C

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Question 3

On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

A. 30 B. 1 C. We cannot say; the number of Mappers is determined by the developer D. 10

Correct Answer: A

Question 4

You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?

A. For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O. B. Increase the IO.sort.mb as high you can, as close to 1GB as possible. C. Decrease the io.sort.mb value below 100M D. Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.

Correct Answer: D

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Question 5

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

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

Correct Answer: A,B,C,D

Question 6

How does the HDFS architecture provide redundancy?

A. Reliance on SAN devices as a DataNode interface. B. DataNodes make copies of their data blocks, and put them on different local disks. C. Reliance on RAID at each datanode. D. Storing multiple replicas of data blocks on different DataNodes.

Correct Answer: D

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Question 7

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

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

Correct Answer: C

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Question 8

Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.

A. In this configuration, the Secondary NameNode performs deal-time backups of the NameNode. B. In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy. C. In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability. D. In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.

Correct Answer: D

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Question 9

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

Correct Answer: D

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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) - CCA-470 Exam Practice Test