Olete.in – MCQs, Mock Tests & Government Job Prep | Apache Hadoop Hadoop Multiple Choice Question

What does commodity Hardware in Hadoop world mean?

1. Very cheap hardware
2. Industry standard hardware
3. Discarded hardware
4. Low specifications Industry grade hardware

✅ Correct Answer: 4

Which of the following are NOT big data problem(s)?

1. Parsing 5 MB XML file every 5 minutes
2. Processing IPL tweet sentiments
3. Processing online bank transactions
4. both (a) and (c)

✅ Correct Answer: 4

What does “Velocity” in Big Data mean?

1. Speed of input data generation
2. Speed of individual machine processors
3. Speed of ONLY storing data
4. Speed of storing and processing data

✅ Correct Answer: 4

The term Big Data first originated from:

1. Stock Markets Domain
2. Banking and Finance Domain
3. Genomics and Astronomy Domain
4. Social Media Domain

✅ Correct Answer: 3

Which of the following Batch Processing instance is NOT an example of Big Data Batch Processing?

1. Processing 10 GB sales data every 6 hours
2. Processing flights sensor data
3. Web crawling app
4. Trending topic analysis of tweets for last 15 minutes

✅ Correct Answer: 4

Which of the following are example(s) of Real Time Big Data Processing?

1. Complex Event Processing (CEP) platforms
2. Stock market data analysis
3. Bank fraud transactions detection
4. both (a) and (c)

✅ Correct Answer: 4

Sliding window operations typically fall in the category of__________________.

1. OLTP Transactions
2. Big Data Batch Processing
3. Big Data Real Time Processing
4. Small Batch Processing

✅ Correct Answer: 3

What is HBase used as?

1. Tool for Random and Fast Read/Write operations in Hadoop
2. Faster Read only query engine in Hadoop
3. MapReduce alternative in Hadoop
4. Fast MapReduce layer in Hadoop

✅ Correct Answer: 4

What is Hive used as?

1. Hadoop query engine
2. MapReduce wrapper
3. Hadoop SQL interface
4. All of the above

✅ Correct Answer: 4

Which of the following are NOT true for Hadoop?

1. It’s a tool for Big Data analysis
2. It supports structured and unstructured data analysis
3. It aims for vertical scaling out/in scenarios
4. Both (a) and (c)

✅ Correct Answer: 4

Which of the following are the core components of Hadoop?

1. HDFS
2. Map Reduce
3. HBase
4. Both (a) and (b)

✅ Correct Answer: 4

Hadoop is open source.

1. ALWAYS True
2. True only for Apache Hadoop
3. True only for Apache and Cloudera Hadoop
4. ALWAYS False

✅ Correct Answer: 2

Hive can be used for real time queries.

1. True
2. False
3. True if a data set is small
4. True for some distributions

✅ Correct Answer: 2

What is the default HDFS block size?

1. 32 MB
2. 64 KB
3. 128 KB
4. 64 MB

✅ Correct Answer: 4

What is the default HDFS replication factor?

1. 4
2. 1
3. 3
4. 2

✅ Correct Answer: 3

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

1. List of files
2. Block locations of files
3. No. of file records
4. File access control information

✅ Correct Answer: 3

Which of the following is/are correct?

1. NameNode is the SPOF in Hadoop 1.x
2. NameNode is the SPOF in Hadoop 2.x
3. NameNode keeps the image of the file system also
4. Both (a) and (c)

✅ Correct Answer: 4

The mechanism used to create replica in HDFS is____________.

1. Gossip protocol
2. Replicate protocol
3. HDFS protocol
4. Store and Forward protocol

✅ Correct Answer: 3

NameNode tries to keep the first copy of data nearest to the client machine.

1. ALWAYS true
2. ALWAYS False
3. True if the client machine is the part of the cluster
4. True if the client machine is not the part of the cluster

✅ Correct Answer: 3

Where is the HDFS replication factor controlled?

1. mapred-site.xml
2. yarn-site.xml
3. core-site.xml
4. hdfs-site.xml

✅ Correct Answer: 4

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

1. hdfs-site.xml
2. core-site.xml
3. hadoop-env.sh
4. Slaves

✅ Correct Answer: 3

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

1. mapred-site.xml
2. hadoop-site.xml
3. core-site.xml
4. Masters

✅ Correct Answer: 2

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

1. True
2. False
3. Depends on cluster size
4. True if co-located with Job tracker

✅ Correct Answer: 2

From the options listed below, select the suitable data sources for the flume.

1. Publicly open web sites
2. Local data folders
3. Remote web servers
4. Both (a) and (c)

✅ Correct Answer: 4

Read the statement and select the correct options: distcp command ALWAYS needs fully qualified hdfs paths.

1. True
2. False
3. True, if source and destination are in the same cluster
4. False, if source and destination are in the same cluster

✅ Correct Answer: 1

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

1. It invokes MapReduce in background
2. It invokes MapReduce if source and destination are in the same cluster
3. It can’t copy data from the local folder to hdfs folder d)
4. You can’t overwrite the files through distcp command

✅ Correct Answer: 1

Which of the following is NOT the component of Flume? (B)

1. Sink
2. Database
3. Source
4. Channel

✅ Correct Answer: 2

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

1. Combine ??Reduce ??Map
2. Map ??Combine ??Reduce
3. Reduce ??Combine ??Map
4. None of These

✅ Correct Answer: 3

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

1. Number of Mappers
2. Number of Reducers
3. Counter
4. Partitioner

✅ Correct Answer: 2

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

1. Group by Minimum
2. Group by Maximum
3. Group by Count
4. Group by Average

✅ Correct Answer: 4

Which of the following is/are true about combiners?

1. Combiners can be used for mapper only job
2. Combiners can be used for any Map Reduce operation
3. Mappers can be used as a combiner class
4. Combiners are primarily aimed to improve Map Reduce performance

✅ Correct Answer: 4

Reduce side join is useful for

1. Very large datasets
2. Very small data sets
3. One small and other big data sets
4. One big and other small datasets

✅ Correct Answer: 4

Distributed Cache can be used in

1. Mapper phase only
2. Reducer phase only
3. In either phase, but not on both sides simultaneously
4. In either phase

✅ Correct Answer: 4

What is the optimal size of a file for distributed cache?

1. <=10 MB
2. >=250 MB
3. <=100 MB
4. <=35 MB

✅ Correct Answer: 3

Number of mappers is decided by the

1. Mappers specified by the programmer
2. Available Mapper slots
3. Available heap memory
4. Input Splits

✅ Correct Answer: 4

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

1. Equi Join
2. Left Outer Join
3. Full Outer Join
4. All of the above

✅ Correct Answer: 4

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

1. ~5s
2. ~15
3. ~150
4. ~50

✅ Correct Answer: 4

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

1. FileInputFormat
2. InputSplit
3. RecordReader
4. Mapper

✅ Correct Answer: 4

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

1. Text
2. IntWritable
3. Nullwritable
4. String

✅ Correct Answer: 3

A Map reduce job can be written in:

1. Java
2. Ruby
3. Python
4. Any Language which can read from input stream

✅ Correct Answer: 4

Pig is a:

1. Programming Language
2. Data Flow Language
3. Query Language
4. Database

✅ Correct Answer: 2

Pig is good for:

1. Data Factory operations
2. Creating multiple datasets from a single large dataset
3. Implementing complex SQLs
4. Both (A) and (B)

✅ Correct Answer: 4

Which of the following is the correct representation to access ‘’Skill” from the Bag {‘Skills’,55, (‘Skill’, ‘Speed’), {2, (‘San’, ‘Mateo’)}}

1. $3.$1
2. $3.$0
3. $2.$0
4. $2.$1

✅ Correct Answer: 1

Maximum size allowed for small dataset in replicated join is:

1. 10KB
2. 10 MB
3. 100 MB
4. 500 MB

✅ Correct Answer: 3

Parameters could be passed to Pig scripts from:

1. Parent Pig Scripts
2. Shell Script
3. Configuration File
4. All the above except (a)

✅ Correct Answer: 4

The schema of a relation can be examined through:

1. ILLUSTRATE
2. DESCRIBE
3. DUMP
4. EXPLAIN

✅ Correct Answer: 2

Data can be supplied to PigUnit tests from:

1. HDFS Location
2. Within Program
3. Both (a) and (b)
4. None of the above

✅ Correct Answer: 3

Which of the following constructs are valid Pig Control Structures?

1. f-else
2. For Loop
3. Until Loop
4. None of the above

✅ Correct Answer: 4

Which of following is the return data type of Filter UDF?

1. String
2. Integer
3. Boolean
4. None of the above

✅ Correct Answer: 3

Which of the following are not possible in Hive?

1. Creating Synonym
2. Writing Update Statements
3. Creating Indexes
4. Both (a) and (b)

✅ Correct Answer: 4

Who will initiate the mapper?

1. Task tracker
2. Job tracker
3. Combiner
4. Reducer

✅ Correct Answer: 1

Which of the following are the Big Data Solutions Candidates?

1. Processing 30 minutes Flight sensor data
2. Interconnecting 50K data points (approx. 1 MB input file)
3. Processing User clicks on a website
4. All of the above

✅ Correct Answer: 4

Hadoop is a framework that allows the distributed processing of:

1. Small Data Sets
2. Semi-Large Data Sets
3. Large Data Sets
4. Large and Small Data sets

✅ Correct Answer: 3

Which of the following are NOT metadata items?

1. HDFS block locations
2. Replication factor of files
3. Access Rights
4. File Records distribution

✅ Correct Answer: 4

What decides number of Mappers for a MapReduce job?

1. File Location
2. mapred.map.tasks parameter
3. Input file size
4. Input Splits

✅ Correct Answer: 3

Name Node monitors block replication process

1. TRUE
2. FALSE
3. Depends on file type
4. All of the above

✅ Correct Answer: 2

Which of the following are true for Hadoop Pseudo Distributed Mode?

1. It runs on multiple machines
2. Runs on multiple machines without any daemons
3. Runs on Single Machine with all daemons
4. Runs on Single Machine without all daemons

✅ Correct Answer: 3

Which of following statement(s) are correct?

1. Master and slaves files are optional in Hadoop 2.x
2. Master file has list of all name nodes
3. Core-site has hdfs and MapReduce related common properties
4. hdfs-site file is now deprecated in Hadoop 2.x

✅ Correct Answer: 3

Which of the following is true for Hive?

1. Hive is the database of Hadoop
2. Hive supports schema checking
3. Hive doesn’t allow row level updates
4. Hive can replace an OLTP system

✅ Correct Answer: 3

Which of the following is the highest level of Data Model in Hive?

1. Table
2. View
3. Database
4. Partitions

✅ Correct Answer: 3

Hive queries response time is in order of

1. Hours at least
2. Minutes at least
3. Seconds at least
4. Milliseconds at least

✅ Correct Answer: 3

Managed tables in Hive:

1. Can load the data only from HDFS
2. Can load the data only from local file system
3. Are useful for enterprise wide data
4. Are Managed by Hive for their data and metadata

✅ Correct Answer: 4