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QUESTION NO: 4

For each YARN job, the Hadoop framework generates task log file. Where are Hadoop task log files

stored?

A. Cached by the NodeManager managing the job containers, then written to a log directory on the

NameNode

B. Cached in the YARN container running the task, then copied into HDFS on job completion

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

D. On the local disk of the slave mode running the task

Correct Answer: D

QUESTION NO: 12

You want to understand more about how users browse your public website. For example, you want to

know which pages they visit prior to placing an order. You have a server farm of 200 web servers hosting

your website. Which is the most efficient process to gather these web server across logs into your Hadoop

cluster analysis?

A. Sample the web server logs web servers and copy them into HDFS using curl

B. Ingest the server web logs into HDFS using Flume

C. Channel these clickstreams into Hadoop using Hadoop Streaming

D. Import all user clicks from your OLTP databases into Hadoop using Sqoop

E. Write a MapReeeduce job with the web servers for mappers and the Hadoop cluster nodes for

reducers

Correct Answer: B

QUESTION NO: 3

Table schemas in Hive are:

A. Stored as metadata on the NameNode

B. Stored along with the data in HDFS

C. Stored in the Metadata

D. Stored in ZooKeeper

Correct Answer: B

QUESTION NO: 10

You are running a Hadoop cluster with a NameNode on host mynamenode, a secondary NameNode on

host mysecondarynamenode and several DataNodes.

Which best describes how you determine when the last checkpoint happened?

A. Execute hdfs namenode report on the command line and look at the Last Checkpoint information

B. Execute hdfs dfsadmin saveNamespace on the command line which returns to you the last checkpoint

value in fstime file

C. Connect to the web UI of the Secondary NameNode (http://mysecondary:50090/) and look at the “Last

Checkpoint” information

D. Connect to the web UI of the NameNode (http://mynamenode:50070) and look at the “Last Checkpoint”

information

Correct Answer: C

QUESTION NO: 15

Identify two features/issues that YARN is designated to address: (Choose two)

A. Standardize on a single MapReduce API

B. Single point of failure in the NameNode

C. Reduce complexity of the MapReduce APIs

D. Resource pressure on the JobTracker

E. Ability to run framework other than MapReduce, such as MPI

F. HDFS latency

Correct Answer: DE

QUESTION NO: 1

Your cluster\’s mapred-start.xml includes the following parameters

mapreduce.map.memory.mb

4096

mapreduce.reduce.memory.mb

8192

And any cluster\’s yarn-site.xml includes the following parameters

yarn.nodemanager.vmen-pmen-ration

2.1

What is the maximum amount of virtual memory allocated for each map task before YARN will kill its

Container?

A. 4 GB

B. 17.2 GB

C. 8.9 GB

D. 8.2 GB

E. 24.6 GB

Correct Answer: D

QUESTION NO: 14

You need to analyze 60,000,000 images stored in JPEG format, each of which is approximately 25 KB.

Because you Hadoop cluster isn\’t optimized for storing and processing many small files, you decide to do

the following actions:

1. Group the individual images into a set of larger files

2. Use the set of larger files as input for a MapReduce job that processes them directly with python using

Hadoop streaming.

Which data serialization system gives the flexibility to do this?

A. CSV

B. XML

C. HTML

D. Avro

E. SequenceFiles

F. JSON

Correct Answer: E

QUESTION NO: 11

What does CDH packaging do on install to facilitate Kerberos security setup?

A. Automatically configures permissions for log files at and MAPRED_LOG_DIR/userlogs

B. Creates users for hdfs and mapreduce to facilitate role assignment

C. Creates directories for temp, hdfs, and mapreduce with the correct permissions

D. Creates a set of pre-configured Kerberos keytab files and their permissions

E. Creates and configures your kdc with default cluster values

Correct Answer: B

QUESTION NO: 6

Each node in your Hadoop cluster, running YARN, has 64GB memory and 24 cores. Your yarn.site.xml

has the following configuration:

yarn.nodemanager.resource.memory-mb

32768

yarn.nodemanager.resource.cpu-vcores

12

You want YARN to launch no more than 16 containers per node. What should you do?

A. Modify yarn-site.xml with the following property:

yarn.scheduler.minimum-allocation-mb

2048

B. Modify yarn-sites.xml with the following property:

yarn.scheduler.minimum-allocation-mb

4096

C. Modify yarn-site.xml with the following property:

yarn.nodemanager.resource.cpu-vccores

D. No action is needed: YARN\’s dynamic resource allocation automatically optimizes the node memory

and cores

Correct Answer: A

QUESTION NO: 8

You are configuring your cluster to run HDFS and MapReducer v2 (MRv2) on YARN. Which two daemons

needs to be installed on your cluster\’s master nodes? (Choose two)

A. HMaster

B. ResourceManager

C. TaskManager

D. JobTracker

E. NameNode

F. DataNode

Correct Answer: BE

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