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Hadoop - HDFS - Level 1

Description

This is the most basic HDFS assessment that is offered as part of this course. This multiple choice and true/false assessment examines the most basic information about HDFS. Because this is the most basic assessment, it is considered "LEVEL-1".
Manoj Vig
Quiz by Manoj Vig, updated more than 1 year ago
Manoj Vig
Created by Manoj Vig over 8 years ago
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Resource summary

Question 1

Question
What does HDFS stands for?
Answer
  • Hadoop file system
  • Hadoop Data File system
  • Hadoop Distributed File System
  • None

Question 2

Question
What is Data Replication in HDFS?
Answer
  • Copy the dataset to a different folder within the same data node
  • Copy the dataset outside of the folder within the Same Data Node
  • Copy the dataset to a different Data Node within HDFS
  • Password protect the dataset

Question 3

Question
What is minimum recommended replication factor for HDFS?
Answer
  • Same as number of data nodes in the cluster
  • Same as number of name nodes, including Primary and Secondary
  • 3
  • 5

Question 4

Question
Since the data is replicated thrice in HDFS, does it mean that any calculation done on one node will also be replicated on the other two?
Answer
  • True
  • False

Question 5

Question
What is a Name Node?
Answer
  • Super Master Node in Hadoop. Everything else runs within it.
  • Master Node for HDFS System
  • Master Node for MapReduce & HDFS both
  • None of the above

Question 6

Question
What is a Data Node?
Answer
  • Node that tracks metadata about the data
  • Slave/Worker Node that stores actual Data
  • Cluster nodes that provide SQL access
  • Backup nodes for HDFS data storage

Question 7

Question
A daemon is a Linux process that reflects an ongoing computing process running in the background
Answer
  • True
  • False

Question 8

Question
What is a "HeartBeat"?
Answer
  • You don't know what a heartbeat is????
  • A process where only two name nodes can communicate with each other
  • A process that enables multiple MapReduce programs to share the same memory container
  • A process that enables two servers to confirm that they are alive and active

Question 9

Question
What is a Data Block in HDFS?
Answer
  • An instance of file stored on one Data node is called a Block
  • HDFS breaks file into exact 3 parts. Each part is called a Block
  • A ‘block’ is the minimum amount of data that can be read or written
  • A block means amount of storage pre-allocated to a folder in HDFS

Question 10

Question
Default Size of data block in Hadoop 2.00 is "128MB". This is a fixed size and can not be customized.
Answer
  • True
  • False

Question 11

Question
How does Hadoop know if a Data Node is Full?
Answer
  • Data node will crash and you will know that it was full...
  • Since there are multiple data nodes, there is no need to know this
  • Name Node contains the metadata and status information of each data nodes and it can figure out which data node is full
  • Hadoop has a database repository. This repository keeps track of storage threshold. Name node queries this repository to find out which data node is full and which one is not

Question 12

Question
Who engineered "DFS" or Distributed File System that HDFS is based on?
Answer
  • Google
  • Amazon
  • Apple
  • Facebook

Question 13

Question
What component can be used to perform basic HDFS operations using a user interface?
Answer
  • Apache Hue
  • Cloudera Manager
  • Ambari
  • Impala

Question 14

Question
Apache Hue is "Owned" by Cloudera
Answer
  • True
  • False

Question 15

Question
What is a "Client" in the context of HDFS?
Answer
  • A user (like you and me) who is writing the file
  • A program that communicates with HDFS to perform file operations
  • All Cloudera Applications like Cloudera manager....
  • All of the above

Question 16

Question
A Secondary Name node is substitute to the Primary Name Node.
Answer
  • True
  • False

Question 17

Question
A Secondary Name node knows everything that a Primary Name node knows because...
Answer
  • They are load balanced
  • There disk is located on a common shared drive that both servers can access at the same time
  • A disk Sync program makes sure that secondary has current information about the Primary
  • Secondary constantly reads Primary's RAM

Question 18

Question
Apache Hue is the only way to perform file operations on HDFS
Answer
  • True
  • False
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