Deck 3: Apache Hadoop Distributed File System (HDFS), Cloud Storage, and Database Instances

Question 1

A file in HDFS that is smaller than a single block size

A)cannot be stored in hdfs
B)occupies the full block\s size.
C)can span over multiple blocks
D)occupies only the size it needs and not the full block

Answer 1

occupies only the size it needs and not the full block

Question 2

Which among the following are the duties of the NameNodes

A)manage file system namespace
B)it is responsible for storing actual data
C)perform read-write operation as per request for the clients
D)none of the above

Answer 2

manage file system namespace

Question 3

If the IP address or hostname of a data node changes

A)the namenode updates the mapping between file name and block name
B)the data in that data node is lost forever
C)the namenode need not update mapping between file name and block name
D)there namenode has to be restarted

Answer 3

the namenode need not update mapping between file name and block name

Question 4

For the frequently accessed HDFS files the blocks are cached in

A)the memory of the data node
B)in the memory of the namenode
C)both the above
D)none of the above

Question 5

Which scenario demands highest bandwidth for data transfer between nodes

A)different nodes on the same rack
B)nodes on different racks in the same data center.
C)nodes in different data centers
D)data on the same node

Question 6

When a client contacts the namenode for accessing a file, the namenode responds with

A)size of the file requested
B)block id and hostname of all the data nodes containing that block
C)block id of the file requested
D)all of the above

Question 7

In HDFS the files cannot be

A)read
B)deleted
C)executed
D)archived

Question 8

Which among the following is the duties of the Data Nodes

A)manage file system namespace
B)stores meta-data
C)regulates client's access to files
D)perform read-write operation as per request for the clients

Question 9

NameNode and DataNode do communicate using

A)active pulse
B)heartbeats
C)h-signal
D)data pulse

Question 10

Amazon EC2 provides virtual computing environments, known as :

A)chunks
B)instances
C)messages
D)none of the mentioned

Question 11

Data stored in ___________    domains doesn't require maintenance of a schema.

A)simpledb
B)sql server
C)oracle
D)rds

Question 12

Which of the following is a system for creating block level storage devices that can be used for Amazon Machine Instances in EC2 ?

A)cloudwatch
B)amazon elastic block store
C)aws import/export
D)all of the mentioned

Question 13

Which of the following type of virtualization is also characteristic of cloud computing

A)storage
B)application
C)cpu
D)all of the mentioned

Question 14

Which of the following is most important feature of cloud storage listed below ?

A)logon authentication
B)bare file
C)multiplatform support
D)adequate bandwidth

Question 15

Which of the following is open cloud storage management standard by SNIA ?

A)cdmi
B)occi
C)cea
D)adequate bandwidth

Question 16

Which of the following system does not provision storage to most users ?

A)paas
B)iaas
C)caas
D)saas

Question 17

Which of the following service is provided by Google for online storage ?

A)drive
B)skydrive
C)dropbox
D)all of the mentioned

Question 18

Which of the following backup create a cloned copy of your current data or drive ?

A)continuous data protection
B)open file backup
C)reverse delta backup
D)none of the mentioned

Question 19

Which of the following storage devices exposes its storage to clients as Raw storage that can be partitioned to create volumes ?

A)block
B)file
C)disk
D)all of the mentioned

Question 20

Which of the following should be used considering factors shown in the figure?

A)simpledb
B)rds
C)amazon ec2
D)all of the mentioned

Question 21

Point out the wrong statement.

A)the metrics obtained by cloudwatch may be used to enable a feature called auto scaling
B)a number of tools are used to support ec2 services
C)amazon machine instances are sized at various levels and rented on a computing/hour basis
D)none of the mentioned

Question 22

Which of the following is an edge-storage or content-delivery system that caches data in different physical locations?

A)amazon relational database service
B)amazon simpledb
C)amazon cloudfront
D)amazon associates web services

Question 23

Which of the following allows you to create instances of the MySQL database to support your Web sites?

A)amazon elastic compute cloud
B)amazon simple queue service
C)amazon relational database service
D)amazon simple storage system

Question 24

. Which of the following allows you to create instances of the MySQL database to support your Web sites?

A)amazon elastic compute cloud
B)amazon simple queue service
C)amazon relational database service
D)amazon simple storage system

Question 25

Point out the correct statement.

A)amazon elastic cloud is a system for creating virtual disks(volume)
B)simpledb interoperates with both amazon ec2 and amazon s3
C)ec3 is an analytics as a service provider
D)none of the mentioned

Question 26

Point out the correct statement.

A)with atmos, you can create your own cloud storage system or leverage a public cloud service with atmos online
B)ibm is a major player in cloud computing particularly for businesses
C)in managed storage, the storage service provider makes storage capacity available to users
D)all of the mentioned

Question 27

Redundancy has to be implemented at the ___________  architectural level for effective results in cloud computing.

A)lower
B)higher
C)middle
D)all of the mentioned

Question 28

Which of the following can manage data from CIFS and NFS file systems over HTTP networks?

A)storagegrid
B)datagrid
C)diskgrid
D)all of the mentioned

Question 29

Point out the wrong statement.

A)aws s3 essentially lets you create your own cloud storage
B)aws created "availability zones" within regions, which are sets of systems that are isolated from one another
C)amazon web services (aws) adds redundancy to its iaas systems by allowing ec2 virtual machine instances
D)none of the mentioned

Question 30

A ___________is a logical unit that serves as the target for storage operations, such as the SCSI protocol READs and WRITEs.

A)gets
B)pun
C)lun
D)all of the mentioned

Question 31

Which of the following use LUNs to define a storage volume that appears to a connected computer as a device?

A)san
B)iscsi
C)fibre channel
D)all of the mentioned

Question 32

Which of the following protocol is used for discovering and retrieving objects from a cloud?

A)occi
B)smtp
C)http
D)all of the mentioned

Question 33

Which of the following disk operation is performed When a tenant is granted access to a virtual storage container?

A)crud
B)file system modifications
C)partitioning
D)all of the mentioned

Question 34

Which of the following standard connect distributed hosts or tenants to their provisioned storage in the cloud?

A)cdmi
B)ocmi
C)coa
D)all of the mentioned

Question 35

IBM and ___________have announced a major initiative to use Hadoop to support university courses in distributed computer programming.

A)google latitude
B)android (operating system)
C)google variations
D)google

Question 36

Point out the correct statement.

A)hadoop is an ideal environment for extracting and transforming small volumes of data
B)hadoop stores data in hdfs and supports data compression/decompression
C)the giraph framework is less useful than a mapreduce job to solve graph and machine learning
D)none of the mentioned

Question 37

What license is Hadoop distributed under?

A)apache license 2.0
B)mozilla public license
C)shareware
D)commercial

Question 38

Sun also has the Hadoop Live CD ___________project, which allows running a fully functional Hadoop cluster using a live CD.

A)openoffice.org
B)opensolaris
C)gnu
D)linux

Question 39

Hadoop achieves reliability by replicating the data across multiple hosts and hence does not require ___________storage on hosts.

A)raid
B)standard raid levels
C)zfs
D)operating system

Question 40

What was Hadoop written in?

A)java (software platform)
B)perl
C)java (programming language)
D)lua (programming language)

Question 41

The Hadoop list includes the HBase database, the Apache Mahout ___________ system, and matrix operations.

A)machine learning
B)pattern recognition
C)statistical classification
D)artificial intelligence

Question 42

The Mapper implementation processes one line at a time via ___________  method. TOPIC 5.2 MAPREDUCE

A)map
B)reduce
C)mapper
D)reducer

Question 43

Point out the correct statement.

A)mapper maps input key/value pairs to a set of intermediate key/value pairs
B)applications typically implement the mapper and reducer interfaces to provide the map and reduce methods
C)mapper and reducer interfaces form the core of the job
D)none of the mentioned

Question 44

The Hadoop MapReduce framework spawns one map task for each ___________     generated by the InputFormat for the job.

A)outputsplit
B)inputsplit
C)inputsplitstream
D)all of the mentioned

Question 45

Users can control which keys (and hence records) go to which Reducer by implementing a custom?

A)partitioner
B)outputsplit
C)reporter
D)all of the mentioned

Question 46

Point out the wrong statement.

A)the mapper outputs are sorted and then partitioned per reducer
B)the total number of partitions is the same as the number of reduce tasks for the job
C)the intermediate, sorted outputs are always stored in a simple (key-len, key, value-len, value) format
D)none of the mentioned

Question 47

Applications can use the __________  to report progress and set application-level status messages.

A)partitioner
B)outputsplit
C)reporter
D)all of the mentioned

Question 48

The right level of parallelism for maps seems to be around ___________  maps per- node.

A)1-10
B)10-100
C)100-150
D)150-200

Question 49

The number of reduces for the job is set by the user via ___________  

A)jobconf.setnumtasks(int)
B)jobconf.setnumreducetasks(int)
C)jobconf.setnummaptasks(int)
D)all of the mentioned

Question 50

The framework groups Reducer inputs by key in ___________  stage.

A)sort
B)shuffle
C)reduce
D)none of the mentioned