Online Hadoop MapReduce Test – Practice For Hadoop Interview

by DataFlair Team · Published December 10, 2018 · Updated December 21, 2018

1. Hadoop Mapreduce Test

It seems that you have mastered the level  1 quiz. So are you ready for the next level? This Hadoop MapReduce test will consist of more of amateur level questions and less of the basics, so be prepared. The only motive behind this MapReduce quiz is to furnish your knowledge and build your accuracy on the questions regarding MapReduce because if you answer them correctly, that will raise your confidence ultimately leading to crack the Hadoop Interview.

Online Hadoop MapReduce Test – Practice For Hadoop Interview

So, All the Best.

All the best for the quiz! - MapReduce Part - 2

Q.1 In MapReduce output of Mapper is stored on

Local Disk

HDFS

In-memory

Q.2 Which of the following is true about combiner
a. Reduces network congestion
b.Execution of combiner is not guaranteed
c. Both a & b
d. None of the above

a

b

c

d

Q.3 Which of the following is called Mini-reduce

Combiner

Partitioner

Reducer

Q.4 By default RecordReader uses which InputFormat for converting data into key-value pairs.

FileInputFormat

TextInputFormat

KeyValueTextInputFormat

SequenceFileInputForma

Q.5 What statement is true about InputSplit?

Logical representation of data

Physical representation of data

Both

Q.6 Which of the following is not an input format in Hadoop?

TextInputFormat

KeyValueTextInputFormat

SequenceFileTextInputFormat

SequenceFileInputFormat

Q.7 In which InputFormat tab character (‘/t’) is used

TextInputFormat

KeyValueTextInputFormat

FileInputFormat

SequenceFileInputFormat

Q.8 Aggregation cannot be done in Mapper in MapReduce

True

False

Q.9 Shuffling and sorting phase in Hadoop occurs

First shuffling then sorting

Simultaneously

First sorting then shuffling

Q.10 What is the correct sequence of data flow in MapReduce
a. InputFormat
b. Shuffling-Sorting
c. Mapper
d. Reducer
e. OutputFormat

acbde

abcde

acdbe

bacde

Q.11 Which among the following is true about SequenceFileInputFormat

Key- byte offset.
Value- It is the contents of the line

Key- Everything up to tab character.
Value- Remaining part of the line after tab character.

Key and value- Both are user-defined

Q.12 Suppose file content is- "on the top of the Tree" then, what is key and value?

Key- 0
Value- on the top of the Tree

Key-on
Value- the top of the Tree

Key-1
Value- on the top of the tree

Key-on the
Value- top of the Tree

Q.13 Which is key and value in TextInputFormat

Key- byte offset.
Value- It is the contents of the line

Key- Everything up to tab character.
Value- Remaining part of the line after tab character.

Key and value- Both are user-defined

Q.14 Which among following is true about KeyValueTextInputFormat

Key- byte offset.
Value- It is the contents of the line

Key- Everything up to tab character.
Value- Remaining part of the line after tab character.

Key and value- Both are user-defined

Q.15 Counters validate that:

Number of bytes read-write within map/reduce job is correct or not

Number of tasks launches and successfully run in map/reduce job is correct or not

Amount of CPU and memory consumed is appropriate for our job and cluster nodes.

All of the above

Q.16 Which of the following is Built-In Counters in Hadoop? 
a. FileSystem Counters
b. FileInputFormat Counters
c. FileOutputFormat counters
d. All of the above

a

b

c

d

Q.17 Which of the following command is used to set the number of reducers for the job

Job.confNumreduceTasks(int)

Job.setNumreduceTasks(int)

Job.setNumreduceTasks()

Job.confNumreduceTasks()

Q.18 Which of the following is not an output format in Hadoop?

TextoutputFormat

ByteoutputFormat

SequenceFileOutputFormat

DBOutputFormat

Q.19 Which of the following OutputFormat is used for writing to relational databases and Hbase?

TextoutputFormat

SequenceFileOutputFormat

MapFileOutputFormat

DBOutputFormat

Q.20 RecordReader handle record boundaries in Text files or Sequence files in MapReduce

True

False

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