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CCA-332 Examination questions (September)

Achieve New Updated (September) Cloudera CCA-332 Examination Questions 1-10

September 24, 2015

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Exam A

 

QUESTION 1

Which of the following commands does Hadoop offer to discover missing or corrupt HDFS data?

 

A.

Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.

B.

dskchk

C.

du

D.

fsck

E.

The map-only checksum utility.

 

Answer: D

Reference:

http://docs.hortonworks.com/CURRENT/index.htm#Monitoring_HDP/Using_Nagios_With_ Hadoop/Nagios_Alerts_For_Hadoop_Services.htm (Corrupt/missing block alert, Possible remedies, third bulleted point)

 

 

QUESTION 2

You have a cluster running with the Fair in Scheduler enabled. There are currently no jobs running on the cluster, and you submit a job A, so that only job A is running on the cluster. A while later, you submit job B, Now job A and job B are running on the cluster at the same time.

 

Which of the following describes how the Fair Scheduler operates? (Choose 2)

 

A.

When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.

B.

When job A gets submitted, it doesn’t consume all the task slots.

C.

When job A gets submitted, it consumes all the task slots.

D.

When job B gets submitted, job A has to finish first, before job B can get scheduled.

 

Answer: CD

Reference: http://hadoop.apache.org/common/docs/r0.20.2/fair_scheduler.html (introduction, first paragraph)

 

 

 

QUESTION 3

You have a cluster running with the FIFO scheduler enabled. You submit a large job A to the cluster which you expect to run for one hour. Then, you submit job B to the cluster, which you expect to run a couple of minutes only. Let’s assume both jobs are running at the same priority.

 

How does the FIFO scheduler execute the jobs? (Choose 3)

 

A.

The order of execution of tasks within a job may vary.

B.

When a job is submitted, all tasks belonging to that job are scheduled.

C.

Given jobs A and B submitted in that order, all tasks from job A will be scheduled before all tasks from job B.

D.

Since job B needs only a few tasks, if might finish before job A completes.

 

Answer: ABC

Reference: http://seriss.com/rush-current/rush/rush-priority.html#FIFO%20Scheduling (see fifo scheduling)

 

 

QUESTION 4

Under which of the following scenarios would it be most appropriate to consider using faster (e.g., 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

 

A.

When the typical workload consists of processor-intensive tasks.

B.

When the typical workload consumes a large amount of input data, relative to the entire Canada of HDFS.

C.

When the typical workload generates a large amount of intermediate data, on the order of the input data itself.

D.

When the typical workload generates a large amount of output data, significantly larger than the amount of intermediate data.

 

Answer: D

 

 

 

QUESTION 5

When determining the most appropriate ratio of processor cores to disk drives for a Hadoop cluster, what are the considerations?

 

A.

Disk drives per machine, nothing else matters.

B.

Processors and disk drives per machine, the workload doesn’t matter

C.

Processor core counts and workload type, the ratio doesn’t matter

D.

Disk drives per core and workload types

E.

Disk drives per core without consideration to workload types

 

Answer: D

 

 

QUESTION 6

Which daemon spawns child JVMs to perform MapReduce processing?

 

A.

JobTracker

B.

NameNode

C.

DataNode

D.

TaskTracker

E.

Secondary NameNode

 

Answer: D

Reference: http://www.mindmeister.com/75831919/hadoop-talk-nathan-milford-outbrain (search Task Tracker)

 

 

QUESTION 7

Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

 

A.

Ten percent of DataNodes simultaneously fail.

B.

All DataNodes simultaneously fail.

C.

An entire rack fails.

D.

Multiple racks simultaneously fail.

E.

Seventy percent of DataNodes simultaneously fail.

 

Answer: A

Reference: http://stackoverflow.com/questions/12399197/in-a-large-properly-configured- multi-rack-hadoop-cluster-which-scenarios-will-b

 

 

QUESTION 8

For each job, the Hadoop framework generates task log files. Where are these log files stored?

 

A.

On the local disk of the slave node running the task.

B.

In HDFS, in the directory of the user who generates the job.

C.

On the local disk of the slave node running the task, then copied into HDFS.

D.

On the local disk of the slave node running the task, but logs are discarded immediately upon task completion.

 

Answer: A

 

 

QUESTION 9

It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)

 

A.

To improve data locality for MapReduce tasks.

B.

To ensure that there is capacity in HDTS for additional data.

C.

To help HDFS deliver consistent performance under heavy loads.

D.

To ensure that all blocks in the cluster are 128MB in size.

E.

To ensure that there is consistent disk utilization across the DataNodes.

 

Answer: BCE

Reference:

http://hadoop.apache.org/docs/hdfs/r0.21.0/api/org/apache/hadoop/hdfs/server/balancer/Ba lancer.html

 

 

 

 

 

 

QUESTION 10

What information is stored on disk on the NameNode? (Choose 4)

 

A.

File permissions of the files in HDFS.

B.

An edit log of changes that have been made since the last backup of the NameNode.

C.

A catalog of DataNodes and the blocks that are stored on them.

D.

Names of the files in HDFS.

E.

The directory structure of the files in HDFS.

F.

An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.

G.

The status of the heartbeats of each DataNode.

 

Answer: CDEF

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