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CCA-332 Examination questions (September)

Achieve New Updated (September) Cloudera CCA-332 Examination Questions 11-20

September 24, 2015

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QUESTION 11

What is the Secondary NameNode?

 

A.

An alternate data channel for clients to reach HDFS, should the NameNode become too busy.

B.

A process that performs a checkpoint operation on the files produced by the NameNode.

C.

A data channel between the primary name node and the tertiary NameNode.

D.

A process purely intended to perform backups of the NameNode.

E.

A standby NameNode, for high availability.

 

Answer: B

Reference:

http://wiki.apache.org/hadoop/FAQ#What_is_the_purpose_of_the_secondary_name- node.3F (3.2)

 

 

QUESTION 12

 

What’s the relationship between JobTrackers and TaskTrackers?

 

A.

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.

B.

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.

C.

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.

D.

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.

 

Answer: A

Reference: http://hadoop.apache.org/mapreduce/docs/r0.22.0/mapred_tutorial.html (Overview, 4th paragraph)

 

 

QUESTION 13

Someone in your data center unplugs a slave node by accident. Users of the cluster notice via the Hadoop Web UI that the cluster size has shrunken and express concerns about data loss and HDFS performance. The replication factor of all the files in the cluster is unchanged from the default of 3. What can you tell the users?

 

A.

The HDFS filesystem is corrupt until the administrator re adds the DataNode to the cluster. The warnings associated with the event should be reported.

B.

After identifying the outage, the NameNode will naturally re-replicate the data and there will be no data loss. The administrator can re-add the DataNode at any time. The client can disregard warnings concerned with this event. Data will be under-replicated but will become properly replicated over time.

C.

The NameNode will re replicate the data after the administrator issues a special command. The data is not lost but is underreplicated until the administrator issues this command.

D.

The NameNode will identify the outage and re-replicate the data when the clients receive connection failures to the DataNode, so the end users can disregard such warnings.

 

 

 

 

 

Answer: B

 

 

QUESTION 14

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 application reads the blocks directly from the DataNodes.

C.

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

 

Answer: B

Reference: http://kazman.shidler.hawaii.edu/ArchDocOverview.html

 

 

QUESTION 15

Which of the following statements arc accurate in describing features of Hadoop rack awareness? (Choose 2)

 

A.

HDFS is rack aware but MapReduce daemons are not.

B.

Rack location is considered in the HDFS block placement policy.

C.

Hadoop gives preference to intra-rack data transfer In order to conserve bandwidth.

D.

Even for small clusters on a single rack, configuring rack awareness will improve performance.

E.

Configuration of rack awareness is accomplished using a configuration file. You cannot use a rack topology script.

 

Answer: BC

 

 

QUESTION 16

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.

Allow short Jobs to complete even when large, long jobs (consuming a lot of resources) are running.

C.

Support the implementation of service-level agreements for multiple cluster users.

D.

Allow multiple users to share clusters in a predictable, policy-guided manner.

E.

Run jobs at periodic times of the day.

F.

Reduce job latencies in an environment with multiple jobs of different sizes.

 

Answer: ADEF

 

 

QUESTION 17

In a Hadoop cluster for running production jobs that require short turnaround times, the most important consideration for slave nodes 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 the amount of memory.

D.

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

E.

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

 

Answer: CE

 

 

QUESTION 18

Which of the following scenarios makes HDFS unavailable?

 

A.

JobTracker failure

B.

TaskTracker failure

C.

DataNode failure

D.

NameNode failure

E.

Secondary NameNode failure

 

Answer: C

Reference: http://stackoverflow.com/questions/12362727/when-will-hdfs-be-unavailable

 

 

 

 

 

 

QUESTION 19

What additional capability does Ganglia provide to that Hadoop alone DOES NOT provide?

 

A.

Ability to monitor number of files in HDFS.

B.

Ability to monitor free task slots.

C.

Ability to monitor processor utilization.

D.

Ability to monitor NameNode memory usage.

E.

Ability to monitor the amount of free space on HDFS.

 

Answer: C

 

 

QUESTION 20

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

 

A.

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

 

Answer: B

 

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