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

Question 1

Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the dfs.hosts property in the NameNode's configuration file empty (blank)?

A. The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.

B. Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.

C. Any machine running the DataNode daemon can immediately join the cluster.

D. No new can be added to the cluster until you specify them in the dfs.hosts file.

Correct Answer: D

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Question 2

For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what's the relationship between tasks and task templates?

A. The developer sets the number of task attempts on job submission.

B. There are always at least as many task attempts as there are tasks.

C. There are always at most as many tasks attempts as there are tasks.

D. There are always exactly as many task attempts as there are tasks.

Correct Answer: D

Question 3

The most important consideration for slave nodes in a Hadoop cluster running production jobs that require short turnaround times is:

A. The ratio between the amount of memory and the number of disk drives.

B. The ratio between the amount of memory and the total storage capacity.

C. The ratio between the number of processor cores and number of disk drives.

D. The ratio between the number of processor cores and total storage capacity.

E. The ratio between the number of processor cores and the amount of memory.

Correct Answer: D

Question 4

You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?

A. One active NameNode and one Standby NameNode

B. Two active NameNodes and one Standby NameNode

C. Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.

D. Two active NameNodes and two Standby NameNodes

Correct Answer: A

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Question 5

Which daemon spawns child JVMs to perform MapReduce processing?

A. NameNode

B. TaskTracker

C. DataNode

D. JobTracker

E. Secondary NameNode

Correct Answer: B

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Question 6

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

A. Number of files that will be stored in HDFS.

B. Amount of memory on the NameNode.

C. Size of "typical" files that will be stored in HDFS.

D. Disk capacity of the NameNode.

E. Number of DataNodes.

Correct Answer: D

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Question 7

What metadata is stored on a DataNode when a block is written to it?

A. Node location of each block belonging to the same namespace.

B. Information on the file's location in HDFS.

C. None. Only the block itself is written.

D. Checksums for the data in the block, as a separate file.

Correct Answer: A

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Question 8

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

A. There are always at most as many task attempts as there are tasks.

B. There are always at least as many task attempts as there are tasks.

C. There are always exactly as many task attempts as there are tasks.

Correct Answer: B

Question 9

A client wants to read a file from HDFS. How does the data get from the DataNodes to the client?

A. The NameNode reads the blocks from the DataNodes, and caches them. Then, the application reads the blocks from the NameNode.

B. The blocks are sent to a single DataNode, then the application reads the blocks from that Data Node.

C. The application reads the blocks directly from the DataNodes.

Correct Answer: C

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Welcome to TestSimulate

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