Question.
Which of the following are true about Hadoop?
Open Source
Distributed Processing Framework
Distributed Storage Framework
All of these
Answer: All of these
Question.
Which of the following are false about Hadoop?
Hadoop works in Master-Slave fashion
Master & Slave both are worker nodes
User submit his work on master, which distribute it to slaves
Slaves are actual worker node
Answer: Master & Slave both are worker nodes
Question.
What is a Metadata in Hadoop?
Data stored by user
Information about the data stored in datanodes
User information
None of these
Answer: Information about the data stored in datanodes
Question.
What is a Daemon?
Process or service that runs in background
Applications submitted by user
Web application running on web server
None of these
Answer: Process or service that runs in background
Question.
All of the following accurately describe Hadoop EXCEPT?
a. Batch processing
b.Open-source
c. Distributed computing
d. Real-time
Answer: Real-time
Question.
All of the following is a core component of Hadoop EXCEPT?
a. Hive
b. HDFS
c. MapReduce
d. YARN
Answer: Hive
Question.
Hadoop is a framework that uses a variety of related tools. Common tools included in a typical implementation include:
a. MapReduce, HDFS, Spool
b. MapReduce, MySQL, Google Apps
c. Cloudera, HortonWorks, MapR
d. MapReduce, Hive, Hbase
Answer: MapReduce, Hive, Hbase
Question.
Which of the following can be used to create workflows when multiple MapReduce and Pig programs need to be executed?
a. Sqoop
b. Zookeeper
c. Oozie
d. Hbase
Answer: Oozie
Question.
Which of the following can be used to transfer bulk data between Hadoop and structured databases
a. Sqoop
b. Hive
c. Pig
d. Spark
Answer: Sqoop
Question.
How many single points of failure does a High Availability HDFS architecture have?
a. 0
b. 1
c. 2
d. 3
Answer: 0
Question.
If a file of size 300MB needs to be stored in the HDFS (block size=64MB, replication factor=2), how many blocks are created for this file in the HDFS?
a. 10
b. 11
c. 12
d. 15
Answer: 10
Question.
What is not a default value for a data block size in the HDFS?
a. 64MB
b. 128MB
c. 512MB
d. 256MB
Answer: 512MB
Question.
Which of the following architectures best describes the HDFS architecture?
a. High Availability
b. Master-Slave
c. Connected
d. Peer
Answer: Master-Slave
Question.
Which of the following is a master process in the HDFS architecture?
a. Datanode
b. JobTracker
c. Namenode
d. Secondary Namenode
Answer: Namenode
Question.
Which of the following is true about Hadoop?
Before storing data we need to specify the schema
We will loss data if one data node crashes
We can add n no of nodes in cluster on the fly (n ~ 15000)
Data is firstly processed on master then on slaves
Answer: We can add n no of nodes in cluster on the fly (n ~ 15000)
Question.
Choose the correct statement?
Master assigns work to all the slaves
We cannot edit data once written in Hadoop
Client need to interact with master first, as it is the single place where all the meta data is available
All of these
Answer: All of these
Question.
Which of the following is the essential module of HDFS?
Node Manager
Resource Manager
DataNode
ALL of the above
Answer: DataNode
Question.
Which of the below is NOT a kind of metadata in NameNode?
Block locations of files
List of files
File access control information
No. of file records
Answer: No. of file records
Question.
Which statement is true about DataNode?
It is the actual worker node that saves and stores meta data.
It is the slave node that saves and stores metadata.
It is the Master node that saves and stores actual data.
It is the slave node that saves and stores actual data.
Answer: It is the slave node that saves and stores actual data.
Question.
Is the Secondary NameNode is the Backup node?
TRUE
FALSE
Answer: FALSE
Question.
Which of the below is programming model planned for handling out large capacities of data in parallel by dividing the effort into a set of independent tasks.
MapReduce
Hive
Pig
HDFS
Answer: MapReduce
Question.
Mappers sorted output is Input to the-
Reducer
Mapper
Shuffle
All of the mentioned
Answer: Reducer
Question.
Which of the following generate intermediate key-value pair?
Reducer
Mapper
Combiner
Partitioner
Answer: Mapper
Question.
What is the major advantages of storing data in block size 128MB?
It saves disk seek time
It saves disk processing time
It saves disk access time
It saves disk latency time
Answer: It saves disk seek time
Question.
Role of Partitioned in Map Reduce Job is :
a) To partition input data into equal parts
b) Distribute data among available reducers
c) To partition data and send to each mapper
d) Distribute data among available mappers
Answer: Distribute data among available reducers
Question.
Which of the following is Single point of Failure?
NameNode
Secondary NameNode
DataNode
None of above
Answer: NameNode
Question.
Apache Hbase is
a) Column family oriented NoSQL database
b) Relational Database
c) Document oriented NoSQL database
d) Not part of Hadoop eco system
Answer: Column family oriented NoSQL database
Question.
Which of the following is a Table Type in Hive ?
a)Managed Table
b)Local Table
c)Persistent Table
d)Memory Table
Answer: Managed Table
Question.
Which of the following is a demon process in Hadoop?
a) NameNode
b) JobNode
c) taskNode
d) mapreducer
Answer: NameNode
Question.
Information about locations of the blocks of a file is stored at ________
a)data nodes
b)name node
c)secondary name node
d)job tracker
Answer: name node
Question.
Apache Sqoop is used to
a) Move data from local file system to HDFS
b) Move data from streaming sources to HDFS
c) Move data from RDBMS to HDFS
d) Move data between Hadoop Clusters
Answer: Move data from RDBMS to HDFS
Question.
In a Map Reduce Program, role of combiner is
a) To combine output from multiple map tasks
b) To combine output from multiple reduce tasks
c) To merge data and create a single output file
d) To aggregate the output of each map task
Answer: To aggregate the output of each map task
Question.
Hive External tables store data in
a) default Hive warehouse location in HDFS
b) default Hive warehouse location in Local file system
c) a custom location in HDFS
d) a custom location in local file system
Answer: a custom location in HDFS
Question.
MapReduce programming model is ________
a)Platform Dependent but not language-specific
b)Neither platform- nor language-specific
c)Platform independent but language-specific
d)Platform Dependent and language-specific
Answer: Neither platform- nor language-specific
Question.
Hive generates results using
a) DAG of Map Reduce Jobs
b) sequencial processing of files
c) MySQL query engine
d) List processing
Answer: DAG of Map Reduce Jobs
Question.
Clients access the blocks directly from ________for read and write
a)data nodes
b)name node
c)secondarynamenode
d)primary node
Answer: data nodes
Question.
In Apache Pig, a Data Bag stores
a) Set of columns
b) set of columns with the same data type
c) set of columns with different data type
d) Set of tuples
Answer: set of columns with the same data type
Question.
You can execute a Pig Script in local mode using the following command
a) pig -mode local
b) pig -x local
c) pig -run local
d) pig -f
Answer: pig -x local
Question.
Default bock size in HDFS is____________
a)128 KB
b)64 KB
c)32 MB
d)128MB
Answer:128MB
Question.
Apache Flume is used to
a) Move data from RDBMS to HDFS
b) Move data from HDFS to RDBMS
c) Move data from One HDFS Cluster to another
d) Move data from Streaming source to HDFS
Answer: Move data from Streaming source to HDFS
Question.
Default data field delimiter used by Hive is
a) Ctrl-a character
b) Tab
a) Ctrl-b character
d) Space
Answer: Ctrl-a character
Question.
What are the characteristics of Big Data?
a)volume, quality, variety
b)volume,velocity, variety
c)volume, quality, quantity
d)qantity and quality only
Answer: volume,velocity, variety
Question.
Which is optional in map reduce program?
a)Mapper
b)Reducer
c)both are optional
d)both are mandatory
Answer: Reducer
Question.
In Hive tables, each table partition data is stored as ?
a) files in separate folders
b) multiple files in same folder
c) a single file
d) multiple xml files
Answer: files in separate folders
Question.
What is the default storage class in Pig Called ?
a)TextStorage
b)DefaultStorage
c)PigStorage
d)BinaryStorage
Answer: PigStorage
