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CCA-500 Cloudera Certified Administrator for Apache Hadoop (CCAH)

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Cloudera · CCA-500

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Question 1

Single choice

Given:

You want to clean up this list by removing jobs where the State is KILLED.

What command you enter?

A
Yarn application refreshJobHistory
B
Yarn application kill application_1374638600275_0109
C
Yarn rmadmin refreshQueue
D
Yarn rmadmin kill application_1374638600275_0109

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Correct answerB

Question 2

Single choice

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

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Correct answerD

Question 3

Multiple choice

What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes. (Choose two)

A
You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes
B
You must modify the configuration files on each of the DataNodes machines
C
You don't need to restart any daemon, as they will pick up changes automatically
D
You must restart the NameNode daemon to apply the changes to the cluster
E
You must restart all six DatNode daemon to apply the changes to the cluster

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Correct answersA, D

Question 4

Single choice

Your company stores user profile records in an OLTP databases. You want to join these records with web server logs you have already ingested into the Hadoop file system.

What is the best way to obtain and ingest these user records?

A
Ingest with Hadoop streaming
B
Ingest using Hive's IQAD DATA command
C
Ingest with sqoop import
D
Ingest with Pig's LOAD command
E
Ingest using the HDFS put command

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Correct answerC

Question 5

Multiple choice

Choose three reasons why should you run the HDFS balancer periodically? (Choose three)

A
To ensure that there is capacity in HDFS for additional data
B
To ensure that all blocks in the cluster are 128MB in size
C
To help HDFS deliver consistent performance under heavy loads
D
To ensure that there is consistent disk utilization across the DataNodes
E
To improve data locality MapReduce

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Correct answersC, D, E

Question 6

Single choice

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

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Correct answerC

Question 7

Single choice

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

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Correct answerB

Question 8

Single choice

Assuming you're not running HDFS Federation, what is the maximum number of NameNode daemons you should run on your cluster in order to avoid a "split-brain" scenario with your NameNode when running HDFS High Availability (HA) using Quorum-based storage?

A
Two active NameNodes and two Standby NameNodes
B
One active NameNode and one Standby NameNode
C
Two active NameNodes and on Standby NameNode
D
Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy

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Correct answerB

Question 9

Single choice

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

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Correct answerB

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2	Multiple choice	2

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Cloudera Certified Administrator for Apache Hadoop (CCAH)

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