Storm For Big Data Set 3

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Free Online Best Storm For Big Data MCQ Questions for improve your basic knowledge of Storm For Big Data. This Storm For Big Data set 3 test that contains 25 Multiple Choice Questions with 4 options. You have to select the right answer to a question.

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Question 1

Which of the following writables can be used to know value from a mapper/reducer?

A	Text
B	IntWritable
C	Nullwritable
D	String

Question 2

What is optimal size of a file for distributed cache?

A	<=10 MB
B	>=250 MB
C	<=100 MB
D	<=35 MB

Question 3

Read the statement NameNodes are usually high storage machines in the clusters

A	TRUE
B	FALSE
C	Depends on cluster size
D	True if co-located with Job tracker

Question 4

Which of the following is NOT a type of metadata in NameNode?

A	List of files
B	Block locations of files
C	No. of file records
D	File access control information

Question 5

Read the statement and select the correct options__ distcp command ALWAYS needs fully qualified hdfs paths

A	TRUE
B	FALSE
C	True, if source and destination are in same cluster
D	False, if source and destination are in same cluster

Question 6

The mechanism used to create replica in HDFS is____________

A	Gossip protocol
B	Replicate protocol
C	HDFS protocol
D	Store and Forward protocol

Question 7

Which of the following is/are true about combiners?

A	Combiners can be used for mapper only job
B	Combiners can be used for any Map Reduce operation
C	Mappers can be used as a combiner class
D	Combiners are primarily aimed to improve Map Reduce performance

Question 8

Distributed Cache can be used in_______

A	Mapper phase only
B	Reducer phase only
C	In either phase, but not on both sides simultaneously
D	In either phase

Question 9

Number of mappers is decided by the___

A	Mappers specified by the programmer
B	Available Mapper slots
C	Available heap memory
D	Input Splits

Question 10

Which of the following class is responsible for converting inputs to key-value Pairs of Map Reduce

A	FileInputFormat
B	InputSplit
C	RecordReader
D	Mapper

Question 11

Where is HDFS replication factor controlled?

A	mapred-site.xml
B	yarn-site.xml
C	core-site.xml
D	hdfs-site.xml

Question 12

Which of the following is the correct sequence of MapReduce flow?

A	Map Reduce Combine
B	Combine Reduce Map
C	Map Combine Reduce
D	Reduce Combine Map

Question 13

Which of the following operations can’t use Reducer as combiner also?

A	Group by Minimum
B	Group by Maximum
C	Group by Count
D	Group by Average

Question 14

Which of the following type of joins can be performed in Reduce side join operation?

A	Equi Join
B	Left Outer Join
C	Right Outer Join
D	All of the above

Question 15

Which of the following is not a valid Hadoop config file?

A	mapred-site.xml
B	hadoop-env.sh
C	yarn-site.xml
D	core-site.xml

Question 16

Which of the following Hadoop config files is used to define the heap size?

A	hdfs-site.xml
B	core-site.xml
C	hadoop-env.sh
D	Slaves

Question 17

What should be an upper limit for counters of a Map Reduce job?

A	~5s
B	~15
C	~150
D	~50

Question 18

From the options listed below, select the suitable data sources for flume___

A	Publicly open web sites
B	Local data folders
C	Remote web servers
D	both a and c

Question 19

Which of the following is/are correct?

A	NameNode is the SPOF in Hadoop 1.x
B	NameNode is the SPOF in Hadoop 2.x
C	NameNode keeps the image of the file system also
D	both a and c

Question 20

Which of the following can be used to control the number of part files in a map reduce program output directory?

A	Number of Mappers
B	Number of Reducers
C	Counter
D	Partitioner

Question 21

NameNode tries to keep the first copy of data nearest to the client machine______

A	ALWAYS true
B	ALWAYS False
C	True if the client machine is the part of the cluster
D	True if the client machine is not the part of the cluster

Question 22

Which of the following is NOT the component of Flume?

A	Sink
B	Database
C	Source
D	Channel

Question 23

Reduce side join is useful for______

A	Very large datasets
B	Very small data sets
C	One small and other big data sets
D	One big and other small datasets

Question 24

Which of following statement(s) are true about distcp command?

A	It invokes MapReduce in background
B	It invokes MapReduce if source and destination are in same cluster
C	It can’t copy data from local folder to hdfs folder
D	You can’t overwrite the files through distcp command

Question 25

What is the default HDFS replication factor?

A	4
B	1
C	3
D	2

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