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

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)

HMaster
ResourceManager
TaskManager
JobTracker
NameNode
DataNode

Correct answer: BE

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?

Execute hdfs namenode –report on the command line and look at the Last Checkpoint information
Execute hdfs dfsadmin –saveNamespace on the command line which returns to you the last checkpoint value in fstime file
Connect to the web UI of the Secondary NameNode (http://mysecondary:50090/) and look at the “Last Checkpoint” information
Connect to the web UI of the NameNode (http://mynamenode:50070) and look at the “Last Checkpoint” information

Correct answer: C

Explanation:

Reference: https://www.inkling.com/read/hadoop-definitive-guide-tom-white-3rd/chapter-10/hdfs

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

Automatically configures permissions for log files at & MAPRED_LOG_DIR/userlogs
Creates users for hdfs and mapreduce to facilitate role assignment
Creates directories for temp, hdfs, and mapreduce with the correct permissions
Creates a set of pre-configured Kerberos keytab files and their permissions
Creates and configures your kdc with default cluster values

Correct answer: B

Which three basic configuration parameters must you set to migrate your cluster from MapReduce 1 (MRv1) to MapReduce V2 (MRv2)? (Choose three)

Configure the NodeManager to enable MapReduce services on YARN by setting the following property in yarn-site.xml:
<name>yarn.nodemanager.hostname</name>
<value>your_nodeManager_shuffle</value>
Configure the NodeManager hostname and enable node services on YARN by setting the following property in yarn-site.xml:
<name>yarn.nodemanager.hostname</name>
<value>your_nodeManager_hostname</value>
Configure a default scheduler to run on YARN by setting the following property in mapred-site.xml:
<name>mapreduce.jobtracker.taskScheduler</name>
<Value>org.apache.hadoop.mapred.JobQueueTaskScheduler</value>
Configure the number of map tasks per jon YARN by setting the following property in mapred:
<name>mapreduce.job.maps</name>
<value>2</value>
Configure the ResourceManager hostname and enable node services on YARN by setting the following property in yarn-site.xml:
<name>yarn.resourcemanager.hostname</name>
<value>your_resourceManager_hostname</value>
Configure MapReduce as a Framework running on YARN by setting the following property in mapred-site.xml:
<name>mapreduce.framework.name</name>
<value>yarn</value>

Correct answer: AEF

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:

Group the individual images into a set of larger files
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?

CSV
XML
HTML
Avro
SequenceFiles
JSON

Correct answer: E

Explanation:

Sequence files are block-compressed and provide direct serialization and deserialization of several arbitrary data types (not just text). Sequence files can be generated as the output of other MapReduce tasks and are an efficient intermediate representation for data that is passing from one MapReduce job to anther.

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

Standardize on a single MapReduce API
Single point of failure in the NameNode
Reduce complexity of the MapReduce APIs
Resource pressure on the JobTracker
Ability to run framework other than MapReduce, such as MPI
HDFS latency

Correct answer: DE

Explanation:

Reference: http://www.revelytix.com/?q=content/hadoop-ecosystem (YARN, first para)

Which is the default scheduler in YARN?

YARN doesn’t configure a default scheduler, you must first assign an appropriate scheduler class in yarn-site.xml
Capacity Scheduler
Fair Scheduler
FIFO Scheduler

Correct answer: B

Explanation:

Reference: http://hadoop.apache.org/docs/r2.4.1/hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html

Which scheduler would you deploy to ensure that your cluster allows short jobs to finish within a reasonable time without starting long-running jobs?

Complexity Fair Scheduler (CFS)
Capacity Scheduler
Fair Scheduler
FIFO Scheduler

Correct answer: C

Explanation:

Reference: http://hadoop.apache.org/docs/r1.2.1/fair_scheduler.html

Your cluster is configured with HDFS and MapReduce version 2 (MRv2) on YARN. What is the result when you execute: hadoop jar SampleJar MyClass on a client machine?

SampleJar.Jar is sent to the ApplicationMaster which allocates a container for SampleJar.Jar
Sample.jar is placed in a temporary directory in HDFS
SampleJar.jar is sent directly to the ResourceManager
SampleJar.jar is serialized into an XML file which is submitted to the ApplicatoionMaster

Correct answer: A

You are working on a project where you need to chain together MapReduce, Pig jobs. You also need the ability to use forks, decision points, and path joins. Which ecosystem project should you use to perform these actions?

Oozie
ZooKeeper
HBase
Sqoop
HUE

Correct answer: A

Vendor:	Cloudera
Exam Code:	CCA-500
Exam Name:	Cloudera Certified Administrator for Apache Hadoop (CCAH)
Date:	Jan 15, 2020
File Size:	211 KB
Downloads:	1

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