Hadoop 101 Quiz Answers - Cognitive Class

Get Hadoop 101 Quiz Answers

Learn the basics of Apache Hadoop, a free, open source, Java-based programming framework. Why was it invented?

Learn about Hadoop’s architecture and core components, such as MapReduce and the Hadoop Distributed File System (HDFS).
Learn how to add and remove nodes from Hadoop clusters, how to check available disk space on each node, and how to modify configuration parameters.
Learn about other Apache projects that are part of the Hadoop ecosystem, including Pig, Hive, HBase, ZooKeeper, Oozie, Sqoop, Flume, among others. BDUprovides separate courses on these other projects, but we recommend you start here.

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Module 1: Introduction to Hadoop

Question: Hadoop is designed for Online Transactional Processing. True or False?

True
False

Question: When is Hadoop useful for an application?

When all of the application data is unstructured
When work can be parallelized
When the application requires low latency data access
When random data access is required

Question: With the help of InfoSphere Streams, Hadoop can be used with data-at-rest as well as data-in-motion. True or false?

True
False

Module 2: Hadoop Architecture & HDFS

Question: Network bandwidth between any two nodes in the same rack is greater than bandwidth between two nodes on different racks. True or False?

True
False

Question: Hadoop works best on a large data set. True or False?

True
False

Question: HDFS is a fully POSIX compliant file system. True or False?

True
False

Module 3: Hadoop Administration

Question: You can add or remove nodes from the open source Apache Ambari console. True or False?

True
False

Question: It is recommended that you start all of the services in Ambari in order to speed up communications. True or False?

True
False

Question: To remove a node using Ambari, you must first remove all of the services using that node. True or False?

True
False

Module 4: Hadoop Components

Question: The output of the shuffle operation goes into the mapper before going into the reducer. True or False?

True
False

Question: What is true about Pig and Hive in relation to the Hadoop ecosystem?

HiveQL requires that you create the data flow
PigLatin requires that the data have a schema
Fewer lines of code are required compared to a Java program
All of the above

Question: Which of the following tools is designed to move data to and from a relational database?

Pig
Flume
Oozie
Sqoop

Final Exam

Question: HDFS is designed for:

Large files, streaming data access, and commodity hardware
Large files, low latency data access, and commodity hardware
Large files, streaming data access, and high-end hardware
Small files, streaming data access, and commodity hardware
None of the options is correct

Question: The Hadoop distributed file system (HDFS) is the only distributed file system supported by Hadoop. True or false?

True
False

Question: The input to a mapper takes the form < k1, v1 > . What form does the mapper’s output take?

< list(k2), v2 >
list( < k2, v2 > )
< k2, list(v2) >
< k1, v1 >
None of the options is correct

Question: What is Flume?

A service for moving large amounts of data around a cluster soon after the data is produced.
A distributed file system.
A programming language that translates high-level queries into map tasks and reduce tasks.
A platform for executing MapReduce jobs.
None of the options is correct

Question: What is the purpose of the shuffle operation in Hadoop MapReduce?

To pre-sort the data before it enters each mapper node.
To distribute input splits among mapper nodes.
To transfer each mapper’s output to the appropriate reducer node based on a partitioning function.
To randomly distribute mapper output among reducer nodes.
None of the options is correct

Question: Which of the following is a duty of the DataNodes in HDFS?

Control the execution of an individual map task or a reduce task.
Maintain the file system tree and metadata for all files and directories.
Manage the file system namespace.
Store and retrieve blocks when told to by clients or the NameNode.
None of the options is correct

Question: Which of the following is a duty of the NameNode in HDFS?

Control the MapReduce job from end-to-end
Maintain the file system tree and metadata for all files and directories
Store the block data
Transfer block data from the data nodes to the clients
None of the options is correct

Question: Which component determines the specific nodes that a MapReduce task will run on?

The NameNode
The JobTracker
The TaskTrackers
The JobClient
None of the options is correct

Question: Which of the following characteristics is common to Pig, Hive, and Jaql?

All translate high-level languages to MapReduce jobs
All operate on JSON data structures
All are data flow languages
All support random reads/writes
None of the options is correct

Question: Which of the following is NOT an open source project related to Hadoop?

Pig
UIMA
Jackal
Avro
Lucene

Question: During the replication process, a block of data is written to all specified DataNodes in parallel. True or false?

True
False

Question: With IBM BigInsights, Hadoop components can be started and stopped from a command line and from the Ambari Console. True or false?

True
False

Question: When loading data into HDFS, data is held at the NameNode until the block is filled and then the data is sent to a DataNode. True or false?

True
False

Question: Which of the following is true about the Hadoop federation?

Uses JournalNodes to decide the active NameNode
Allows non-Hadoop programs to access data in HDFS
Allows multiple NameNodes with their own namespaces to share a pool of DataNodes
Implements a resource manager external to all Hadoop frameworks

Question: Which of the following is true about Hadoop high availability?

Uses JournalNodes to decide the active NameNode
Allows non-Hadoop programs to access data in HDFS
Allows multiple NameNodes with their own namespaces to share a pool of DataNodes
Implements a resource manager external to all Hadoop frameworks

Question: Which of the following is true about YARN?

Uses JournalNodes to decide the active NameNode
Allows non-Hadoop programs to access data in HDFS
Allows multiple NameNodes with their own namespaces to share a pool of DataNodes
Implements a resource manager external to all Hadoop frameworks

Question: Which of the following sentences is true?

Hadoop is good for OLTP, DSS, and big data
Hadoop includes open source components and closed source components
Hadoop is a new technology designed to replace relational databases
All of the options are correct
None of the options is correct

Question: In which of these scenarios should Hadoop be used?

Processing billions of email messages to perform text analytics
Obtaining stock price trends on a per-minute basis
Processing weather sensor information to predict a hurricane path
Analyzing vital signs of a baby in real time
None of the options is correct

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